Merge pull request #45845 from qarmin/cppcheck_scene_2

Initialize class variables with default values in scene/ [2/2]

171 files changed, 1022 insertions, 1904 deletions

diff --git a/editor/editor_feature_profile.cpp b/editor/editor_feature_profile.cpp
index af02fcaf3c..bd00d86ec8 100644
--- a/editor/editor_feature_profile.cpp
+++ b/editor/editor_feature_profile.cpp
@@ -277,11 +277,7 @@ void EditorFeatureProfile::_bind_methods() {
 	BIND_ENUM_CONSTANT(FEATURE_MAX);
 }
 
-EditorFeatureProfile::EditorFeatureProfile() {
-	for (int i = 0; i < FEATURE_MAX; i++) {
-		features_disabled[i] = false;
-	}
-}
+EditorFeatureProfile::EditorFeatureProfile() {}
 
 //////////////////////////
 
diff --git a/scene/3d/vehicle_body_3d.h b/scene/3d/vehicle_body_3d.h
index 3c35c0ce97..860fa7e3b7 100644
--- a/scene/3d/vehicle_body_3d.h
+++ b/scene/3d/vehicle_body_3d.h
@@ -87,7 +87,7 @@ class VehicleWheel3D : public Node3D {
 		Vector3 m_wheelDirectionWS; //direction in worldspace
 		Vector3 m_wheelAxleWS; // axle in worldspace
 		bool m_isInContact = false;
-		PhysicsBody3D *m_groundObject; //could be general void* ptr
+		PhysicsBody3D *m_groundObject = nullptr; //could be general void* ptr
 	} m_raycastInfo;
 
 	void _update(PhysicsDirectBodyState3D *s);
diff --git a/scene/animation/animation_blend_space_2d.cpp b/scene/animation/animation_blend_space_2d.cpp
index b80ae30f1a..9c4bc107dd 100644
--- a/scene/animation/animation_blend_space_2d.cpp
+++ b/scene/animation/animation_blend_space_2d.cpp
@@ -437,7 +437,7 @@ float AnimationNodeBlendSpace2D::process(float p_time, bool p_seek) {
 	Vector2 blend_pos = get_parameter(blend_position);
 	int closest = get_parameter(this->closest);
 	float length_internal = get_parameter(this->length_internal);
-	float mind = 0; //time of min distance point
+	float mind = 0.0; //time of min distance point
 
 	if (blend_mode == BLEND_MODE_INTERPOLATED) {
 		if (triangles.size() == 0) {
@@ -529,7 +529,7 @@ float AnimationNodeBlendSpace2D::process(float p_time, bool p_seek) {
 		}
 
 		if (new_closest != closest && new_closest != -1) {
-			float from = 0;
+			float from = 0.0;
 			if (blend_mode == BLEND_MODE_DISCRETE_CARRY && closest != -1) {
 				//see how much animation remains
 				from = blend_node(blend_points[closest].name, blend_points[closest].node, p_time, true, 0.0, FILTER_IGNORE, false) - length_internal;
diff --git a/scene/animation/animation_blend_tree.cpp b/scene/animation/animation_blend_tree.cpp
index 4a0e9e99be..91b4ae6ab0 100644
--- a/scene/animation/animation_blend_tree.cpp
+++ b/scene/animation/animation_blend_tree.cpp
@@ -702,7 +702,7 @@ float AnimationNodeTransition::process(float p_time, bool p_seek) {
 		return 0;
 	}
 
-	float rem = 0;
+	float rem = 0.0;
 
 	if (prev < 0) { // process current animation, check for transition
 
diff --git a/scene/animation/animation_node_state_machine.cpp b/scene/animation/animation_node_state_machine.cpp
index 552e6b6f5d..4f69b05afe 100644
--- a/scene/animation/animation_node_state_machine.cpp
+++ b/scene/animation/animation_node_state_machine.cpp
@@ -393,7 +393,7 @@ float AnimationNodeStateMachinePlayback::process(AnimationNodeStateMachine *p_st
 
 	//find next
 	StringName next;
-	float next_xfade = 0;
+	float next_xfade = 0.0;
 	AnimationNodeStateMachineTransition::SwitchMode switch_mode = AnimationNodeStateMachineTransition::SWITCH_MODE_IMMEDIATE;
 
 	if (path.size()) {
diff --git a/scene/animation/animation_player.cpp b/scene/animation/animation_player.cpp
index 8ea0c5e6e2..362296ef6a 100644
--- a/scene/animation/animation_player.cpp
+++ b/scene/animation/animation_player.cpp
@@ -1132,7 +1132,7 @@ void AnimationPlayer::play(const StringName &p_name, float p_custom_blend, float
 	Playback &c = playback;
 
 	if (c.current.from) {
-		float blend_time = 0;
+		float blend_time = 0.0;
 		// find if it can blend
 		BlendKey bk;
 		bk.from = c.current.from->name;
diff --git a/scene/animation/animation_tree.cpp b/scene/animation/animation_tree.cpp
index 0f0cdc67f4..73217760ae 100644
--- a/scene/animation/animation_tree.cpp
+++ b/scene/animation/animation_tree.cpp
@@ -158,7 +158,7 @@ float AnimationNode::blend_input(int p_input, float p_time, bool p_seek, float p
 	Ref<AnimationNode> node = blend_tree->get_node(node_name);
 
 	//inputs.write[p_input].last_pass = state->last_pass;
-	float activity = 0;
+	float activity = 0.0;
 	float ret = _blend_node(node_name, blend_tree->get_node_connection_array(node_name), nullptr, node, p_time, p_seek, p_blend, p_filter, p_optimize, &activity);
 
 	Vector<AnimationTree::Activity> *activity_ptr = state->tree->input_activity_map.getptr(base_path);
diff --git a/scene/animation/tween.cpp b/scene/animation/tween.cpp
index 354f7e5aae..62d03ea80c 100644
--- a/scene/animation/tween.cpp
+++ b/scene/animation/tween.cpp
@@ -1098,7 +1098,7 @@ void Tween::seek(real_t p_time) {
 real_t Tween::tell() const {
 	// We want to grab the position of the furthest along tween
 	pending_update++;
-	real_t pos = 0;
+	real_t pos = 0.0;
 
 	// For each interpolation...
 	for (const List<InterpolateData>::Element *E = interpolates.front(); E; E = E->next()) {
@@ -1122,7 +1122,7 @@ real_t Tween::get_runtime() const {
 	pending_update++;
 
 	// For each interpolation...
-	real_t runtime = 0;
+	real_t runtime = 0.0;
 	for (const List<InterpolateData>::Element *E = interpolates.front(); E; E = E->next()) {
 		// Get the tween data and see if it's runtime is greater than the previous tweens
 		const InterpolateData &data = E->get();
diff --git a/scene/gui/base_button.cpp b/scene/gui/base_button.cpp
index 27e33be9d7..a7a7022b2e 100644
--- a/scene/gui/base_button.cpp
+++ b/scene/gui/base_button.cpp
@@ -448,18 +448,7 @@ void BaseButton::_bind_methods() {
 }
 
 BaseButton::BaseButton() {
-	toggle_mode = false;
-	shortcut_in_tooltip = true;
-	keep_pressed_outside = false;
-	status.pressed = false;
-	status.press_attempt = false;
-	status.hovering = false;
-	status.pressing_inside = false;
-	status.disabled = false;
 	set_focus_mode(FOCUS_ALL);
-	action_mode = ACTION_MODE_BUTTON_RELEASE;
-	button_mask = BUTTON_MASK_LEFT;
-	shortcut_context = ObjectID();
 }
 
 BaseButton::~BaseButton() {
diff --git a/scene/gui/base_button.h b/scene/gui/base_button.h
index b349b75761..d54d63cc39 100644
--- a/scene/gui/base_button.h
+++ b/scene/gui/base_button.h
@@ -45,21 +45,21 @@ public:
 	};
 
 private:
-	int button_mask;
-	bool toggle_mode;
-	bool shortcut_in_tooltip;
-	bool keep_pressed_outside;
+	int button_mask = BUTTON_MASK_LEFT;
+	bool toggle_mode = false;
+	bool shortcut_in_tooltip = true;
+	bool keep_pressed_outside = false;
 	Ref<Shortcut> shortcut;
 	ObjectID shortcut_context;
 
-	ActionMode action_mode;
+	ActionMode action_mode = ACTION_MODE_BUTTON_RELEASE;
 	struct Status {
-		bool pressed;
-		bool hovering;
-		bool press_attempt;
-		bool pressing_inside;
+		bool pressed = false;
+		bool hovering = false;
+		bool press_attempt = false;
+		bool pressing_inside = false;
 
-		bool disabled;
+		bool disabled = false;
 
 	} status;
 
diff --git a/scene/gui/box_container.cpp b/scene/gui/box_container.cpp
index a00d755c9c..c570438b6a 100644
--- a/scene/gui/box_container.cpp
+++ b/scene/gui/box_container.cpp
@@ -33,9 +33,9 @@
 #include "margin_container.h"
 
 struct _MinSizeCache {
-	int min_size;
-	bool will_stretch;
-	int final_size;
+	int min_size = 0;
+	bool will_stretch = false;
+	int final_size = 0;
 };
 
 void BoxContainer::_resort() {
@@ -50,7 +50,7 @@ void BoxContainer::_resort() {
 	int children_count = 0;
 	int stretch_min = 0;
 	int stretch_avail = 0;
-	float stretch_ratio_total = 0;
+	float stretch_ratio_total = 0.0;
 	Map<Control *, _MinSizeCache> min_size_cache;
 
 	for (int i = 0; i < get_child_count(); i++) {
@@ -105,7 +105,7 @@ void BoxContainer::_resort() {
 
 		has_stretched = true;
 		bool refit_successful = true; //assume refit-test will go well
-		float error = 0; // Keep track of accumulated error in pixels
+		float error = 0.0; // Keep track of accumulated error in pixels
 
 		for (int i = 0; i < get_child_count(); i++) {
 			Control *c = Object::cast_to<Control>(get_child(i));
@@ -331,7 +331,6 @@ void BoxContainer::add_spacer(bool p_begin) {
 
 BoxContainer::BoxContainer(bool p_vertical) {
 	vertical = p_vertical;
-	align = ALIGN_BEGIN;
 }
 
 void BoxContainer::_bind_methods() {
diff --git a/scene/gui/box_container.h b/scene/gui/box_container.h
index 8285c2b9a2..31050d1feb 100644
--- a/scene/gui/box_container.h
+++ b/scene/gui/box_container.h
@@ -44,8 +44,8 @@ public:
 	};
 
 private:
-	bool vertical;
-	AlignMode align;
+	bool vertical = false;
+	AlignMode align = ALIGN_BEGIN;
 
 	void _resort();
 
diff --git a/scene/gui/button.cpp b/scene/gui/button.cpp
index 8b3daf79a8..e50b2d7cfe 100644
--- a/scene/gui/button.cpp
+++ b/scene/gui/button.cpp
@@ -203,7 +203,7 @@ void Button::_notification(int p_what) {
 					color_icon.a = 0.4;
 				}
 
-				float icon_ofs_region = 0;
+				float icon_ofs_region = 0.0;
 				if (rtl) {
 					if (_internal_margin[SIDE_RIGHT] > 0) {
 						icon_ofs_region = _internal_margin[SIDE_RIGHT] + get_theme_constant("hseparation");
@@ -544,16 +544,8 @@ Button::Button(const String &p_text) {
 	text_buf.instance();
 	text_buf->set_flags(TextServer::BREAK_MANDATORY);
 
-	flat = false;
-	clip_text = false;
-	expand_icon = false;
 	set_mouse_filter(MOUSE_FILTER_STOP);
 	set_text(p_text);
-	align = ALIGN_CENTER;
-
-	for (int i = 0; i < 4; i++) {
-		_internal_margin[i] = 0;
-	}
 }
 
 Button::~Button() {
diff --git a/scene/gui/button.h b/scene/gui/button.h
index d633fddc8a..d968f63f51 100644
--- a/scene/gui/button.h
+++ b/scene/gui/button.h
@@ -45,7 +45,7 @@ public:
 	};
 
 private:
-	bool flat;
+	bool flat = false;
 	String text;
 	String xl_text;
 	Ref<TextParagraph> text_buf;
@@ -55,10 +55,10 @@ private:
 	TextDirection text_direction = TEXT_DIRECTION_AUTO;
 
 	Ref<Texture2D> icon;
-	bool expand_icon;
-	bool clip_text;
-	TextAlign align;
-	float _internal_margin[4];
+	bool expand_icon = false;
+	bool clip_text = false;
+	TextAlign align = ALIGN_CENTER;
+	float _internal_margin[4] = {};
 
 	void _shape();
 
diff --git a/scene/gui/center_container.cpp b/scene/gui/center_container.cpp
index f2d1dee0fc..909516e7ef 100644
--- a/scene/gui/center_container.cpp
+++ b/scene/gui/center_container.cpp
@@ -95,6 +95,4 @@ void CenterContainer::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "use_top_left"), "set_use_top_left", "is_using_top_left");
 }
 
-CenterContainer::CenterContainer() {
-	use_top_left = false;
-}
+CenterContainer::CenterContainer() {}
diff --git a/scene/gui/center_container.h b/scene/gui/center_container.h
index ee8b2e0e48..0944f200fc 100644
--- a/scene/gui/center_container.h
+++ b/scene/gui/center_container.h
@@ -36,7 +36,7 @@
 class CenterContainer : public Container {
 	GDCLASS(CenterContainer, Container);
 
-	bool use_top_left;
+	bool use_top_left = false;
 
 protected:
 	void _notification(int p_what);
diff --git a/scene/gui/color_picker.cpp b/scene/gui/color_picker.cpp
index 6c36db0c92..a3205c27a7 100644
--- a/scene/gui/color_picker.cpp
+++ b/scene/gui/color_picker.cpp
@@ -719,17 +719,6 @@ void ColorPicker::_bind_methods() {
 
 ColorPicker::ColorPicker() :
 		BoxContainer(true) {
-	updating = true;
-	edit_alpha = true;
-	text_is_constructor = false;
-	hsv_mode_enabled = false;
-	raw_mode_enabled = false;
-	deferred_mode_enabled = false;
-	changing_color = false;
-	presets_enabled = true;
-	presets_visible = true;
-	screen = nullptr;
-
 	HBoxContainer *hb_edit = memnew(HBoxContainer);
 	add_child(hb_edit);
 	hb_edit->set_v_size_flags(SIZE_EXPAND_FILL);
@@ -1002,12 +991,5 @@ void ColorPickerButton::_bind_methods() {
 }
 
 ColorPickerButton::ColorPickerButton() {
-	// Initialization is now done deferred,
-	// this improves performance in the inspector as the color picker
-	// can be expensive to initialize.
-	picker = nullptr;
-	popup = nullptr;
-	edit_alpha = true;
-
 	set_toggle_mode(true);
 }
diff --git a/scene/gui/color_picker.h b/scene/gui/color_picker.h
index 3695820a79..7915527bc0 100644
--- a/scene/gui/color_picker.h
+++ b/scene/gui/color_picker.h
@@ -46,7 +46,7 @@ class ColorPicker : public BoxContainer {
 	GDCLASS(ColorPicker, BoxContainer);
 
 private:
-	Control *screen;
+	Control *screen = nullptr;
 	Control *uv_edit;
 	Control *w_edit;
 	TextureRect *sample;
@@ -64,20 +64,22 @@ private:
 	Label *labels[4];
 	Button *text_type;
 	LineEdit *c_text;
-	bool edit_alpha;
+	bool edit_alpha = true;
 	Size2i ms;
-	bool text_is_constructor;
-	int presets_per_row;
+	bool text_is_constructor = false;
+	int presets_per_row = 0;
 
 	Color color;
-	bool raw_mode_enabled;
-	bool hsv_mode_enabled;
-	bool deferred_mode_enabled;
-	bool updating;
-	bool changing_color;
-	bool presets_enabled;
-	bool presets_visible;
-	float h, s, v;
+	bool raw_mode_enabled = false;
+	bool hsv_mode_enabled = false;
+	bool deferred_mode_enabled = false;
+	bool updating = true;
+	bool changing_color = false;
+	bool presets_enabled = true;
+	bool presets_visible = true;
+	float h = 0.0;
+	float s = 0.0;
+	float v = 0.0;
 	Color last_hsv;
 
 	void _html_entered(const String &p_html);
@@ -139,10 +141,14 @@ public:
 class ColorPickerButton : public Button {
 	GDCLASS(ColorPickerButton, Button);
 
-	PopupPanel *popup;
-	ColorPicker *picker;
+	// Initialization is now done deferred,
+	// this improves performance in the inspector as the color picker
+	// can be expensive to initialize.
+
+	PopupPanel *popup = nullptr;
+	ColorPicker *picker = nullptr;
 	Color color;
-	bool edit_alpha;
+	bool edit_alpha = true;
 
 	void _color_changed(const Color &p_color);
 	void _modal_closed();
diff --git a/scene/gui/container.cpp b/scene/gui/container.cpp
index 03bade6702..2e6b798eea 100644
--- a/scene/gui/container.cpp
+++ b/scene/gui/container.cpp
@@ -180,7 +180,6 @@ void Container::_bind_methods() {
 }
 
 Container::Container() {
-	pending_sort = false;
 	// All containers should let mouse events pass by default.
 	set_mouse_filter(MOUSE_FILTER_PASS);
 }
diff --git a/scene/gui/container.h b/scene/gui/container.h
index 5e60ca04dc..a4f392a3ae 100644
--- a/scene/gui/container.h
+++ b/scene/gui/container.h
@@ -36,7 +36,7 @@
 class Container : public Control {
 	GDCLASS(Container, Control);
 
-	bool pending_sort;
+	bool pending_sort = false;
 	void _sort_children();
 	void _child_minsize_changed();
 
diff --git a/scene/gui/control.h b/scene/gui/control.h
index ac2a1b35de..9f5adf11e3 100644
--- a/scene/gui/control.h
+++ b/scene/gui/control.h
@@ -179,13 +179,13 @@ private:
 
 		LayoutDirection layout_dir = LAYOUT_DIRECTION_INHERITED;
 
-		float rotation = 0;
+		float rotation = 0.0;
 		Vector2 scale = Vector2(1, 1);
 		Vector2 pivot_offset;
 
 		int h_size_flags = SIZE_FILL;
 		int v_size_flags = SIZE_FILL;
-		float expand = 1;
+		float expand = 1.0;
 		Point2 custom_minimum_size;
 
 		MouseFilter mouse_filter = MOUSE_FILTER_STOP;
diff --git a/scene/gui/dialogs.cpp b/scene/gui/dialogs.cpp
index 773c609a70..fdfbf9eafc 100644
--- a/scene/gui/dialogs.cpp
+++ b/scene/gui/dialogs.cpp
@@ -292,8 +292,6 @@ void AcceptDialog::set_swap_cancel_ok(bool p_swap) {
 }
 
 AcceptDialog::AcceptDialog() {
-	parent_visible = nullptr;
-
 	set_wrap_controls(true);
 	set_visible(false);
 	set_transient(true);
@@ -325,7 +323,6 @@ AcceptDialog::AcceptDialog() {
 
 	ok->connect("pressed", callable_mp(this, &AcceptDialog::_ok_pressed));
 
-	hide_on_ok = true;
 	set_title(RTR("Alert!"));
 
 	connect("window_input", callable_mp(this, &AcceptDialog::_input_from_window));
diff --git a/scene/gui/dialogs.h b/scene/gui/dialogs.h
index e450a3c30a..b072055d49 100644
--- a/scene/gui/dialogs.h
+++ b/scene/gui/dialogs.h
@@ -44,12 +44,12 @@ class LineEdit;
 class AcceptDialog : public Window {
 	GDCLASS(AcceptDialog, Window);
 
-	Window *parent_visible;
+	Window *parent_visible = nullptr;
 	Panel *bg;
 	HBoxContainer *hbc;
 	Label *label;
 	Button *ok;
-	bool hide_on_ok;
+	bool hide_on_ok = true;
 
 	void _custom_action(const String &p_action);
 	void _update_child_rects();
diff --git a/scene/gui/file_dialog.cpp b/scene/gui/file_dialog.cpp
index 3a0350b9fb..7453324505 100644
--- a/scene/gui/file_dialog.cpp
+++ b/scene/gui/file_dialog.cpp
@@ -852,8 +852,6 @@ void FileDialog::set_default_show_hidden_files(bool p_show) {
 FileDialog::FileDialog() {
 	show_hidden_files = default_show_hidden_files;
 
-	mode_overrides_title = true;
-
 	vbox = memnew(VBoxContainer);
 	add_child(vbox);
 	vbox->connect("theme_changed", callable_mp(this, &FileDialog::_theme_changed));
@@ -925,7 +923,6 @@ FileDialog::FileDialog() {
 	vbox->add_child(file_box);
 
 	dir_access = DirAccess::create(DirAccess::ACCESS_RESOURCES);
-	access = ACCESS_RESOURCES;
 	_update_drives();
 
 	connect("confirmed", callable_mp(this, &FileDialog::_action_pressed));
@@ -967,7 +964,6 @@ FileDialog::FileDialog() {
 
 	set_hide_on_ok(false);
 
-	invalidated = true;
 	if (register_func) {
 		register_func(this);
 	}
diff --git a/scene/gui/file_dialog.h b/scene/gui/file_dialog.h
index 626bb78d42..25b742c234 100644
--- a/scene/gui/file_dialog.h
+++ b/scene/gui/file_dialog.h
@@ -69,7 +69,7 @@ private:
 	LineEdit *makedirname;
 
 	Button *makedir;
-	Access access;
+	Access access = ACCESS_RESOURCES;
 	//Button *action;
 	VBoxContainer *vbox;
 	FileMode mode;
@@ -93,12 +93,12 @@ private:
 
 	Vector<String> filters;
 
-	bool mode_overrides_title;
+	bool mode_overrides_title = true;
 
 	static bool default_show_hidden_files;
-	bool show_hidden_files;
+	bool show_hidden_files = false;
 
-	bool invalidated;
+	bool invalidated = true;
 
 	void update_dir();
 	void update_file_name();
diff --git a/scene/gui/gradient_edit.cpp b/scene/gui/gradient_edit.cpp
index d18fff887d..36b383f16c 100644
--- a/scene/gui/gradient_edit.cpp
+++ b/scene/gui/gradient_edit.cpp
@@ -42,8 +42,6 @@
 #endif
 
 GradientEdit::GradientEdit() {
-	grabbed = -1;
-	grabbing = false;
 	set_focus_mode(FOCUS_ALL);
 
 	popup = memnew(PopupPanel);
diff --git a/scene/gui/gradient_edit.h b/scene/gui/gradient_edit.h
index 189b33f563..eb7367d598 100644
--- a/scene/gui/gradient_edit.h
+++ b/scene/gui/gradient_edit.h
@@ -44,8 +44,8 @@ class GradientEdit : public Control {
 
 	Ref<ImageTexture> checker;
 
-	bool grabbing;
-	int grabbed;
+	bool grabbing = false;
+	int grabbed = -1;
 	Vector<Gradient::Point> points;
 
 	void _draw_checker(int x, int y, int w, int h);
diff --git a/scene/gui/graph_edit.cpp b/scene/gui/graph_edit.cpp
index d7602bd7cf..56ea4d8d55 100644
--- a/scene/gui/graph_edit.cpp
+++ b/scene/gui/graph_edit.cpp
@@ -1657,8 +1657,6 @@ void GraphEdit::_bind_methods() {
 GraphEdit::GraphEdit() {
 	set_focus_mode(FOCUS_ALL);
 
-	awaiting_scroll_offset_update = false;
-	top_layer = nullptr;
 	top_layer = memnew(GraphEditFilter(this));
 	add_child(top_layer);
 	top_layer->set_mouse_filter(MOUSE_FILTER_PASS);
@@ -1681,13 +1679,6 @@ GraphEdit::GraphEdit() {
 	v_scroll->set_name("_v_scroll");
 	top_layer->add_child(v_scroll);
 
-	updating = false;
-	connecting = false;
-	right_disconnects = false;
-
-	box_selecting = false;
-	dragging = false;
-
 	//set large minmax so it can scroll even if not resized yet
 	h_scroll->set_min(-10000);
 	h_scroll->set_max(10000);
@@ -1698,8 +1689,6 @@ GraphEdit::GraphEdit() {
 	h_scroll->connect("value_changed", callable_mp(this, &GraphEdit::_scroll_moved));
 	v_scroll->connect("value_changed", callable_mp(this, &GraphEdit::_scroll_moved));
 
-	zoom = 1;
-
 	zoom_hb = memnew(HBoxContainer);
 	top_layer->add_child(zoom_hb);
 	zoom_hb->set_position(Vector2(10, 10));
@@ -1768,7 +1757,5 @@ GraphEdit::GraphEdit() {
 	minimap->set_offset(Side::SIDE_BOTTOM, -MINIMAP_OFFSET);
 	minimap->connect("draw", callable_mp(this, &GraphEdit::_minimap_draw));
 
-	setting_scroll_ofs = false;
-	just_disconnected = false;
 	set_clip_contents(true);
 }
diff --git a/scene/gui/graph_edit.h b/scene/gui/graph_edit.h
index 4525152bd5..2ca9b75ea7 100644
--- a/scene/gui/graph_edit.h
+++ b/scene/gui/graph_edit.h
@@ -99,9 +99,9 @@ public:
 	struct Connection {
 		StringName from;
 		StringName to;
-		int from_port;
-		int to_port;
-		float activity;
+		int from_port = 0;
+		int to_port = 0;
+		float activity = 0.0;
 	};
 
 private:
@@ -121,41 +121,41 @@ private:
 	HScrollBar *h_scroll;
 	VScrollBar *v_scroll;
 
-	float port_grab_distance_horizontal;
+	float port_grab_distance_horizontal = 0.0;
 	float port_grab_distance_vertical;
 
-	bool connecting;
+	bool connecting = false;
 	String connecting_from;
-	bool connecting_out;
-	int connecting_index;
-	int connecting_type;
+	bool connecting_out = false;
+	int connecting_index = 0;
+	int connecting_type = 0;
 	Color connecting_color;
-	bool connecting_target;
+	bool connecting_target = false;
 	Vector2 connecting_to;
 	String connecting_target_to;
 	int connecting_target_index;
-	bool just_disconnected;
-	bool connecting_valid;
+	bool just_disconnected = false;
+	bool connecting_valid = false;
 	Vector2 click_pos;
 
-	bool dragging;
-	bool just_selected;
-	bool moving_selection;
+	bool dragging = false;
+	bool just_selected = false;
+	bool moving_selection = false;
 	Vector2 drag_accum;
 
-	float zoom;
+	float zoom = 1.0;
 
-	bool box_selecting;
-	bool box_selection_mode_additive;
+	bool box_selecting = false;
+	bool box_selection_mode_additive = false;
 	Point2 box_selecting_from;
 	Point2 box_selecting_to;
 	Rect2 box_selecting_rect;
 	List<GraphNode *> previus_selected;
 
-	bool setting_scroll_ofs;
-	bool right_disconnects;
-	bool updating;
-	bool awaiting_scroll_offset_update;
+	bool setting_scroll_ofs = false;
+	bool right_disconnects = false;
+	bool updating = false;
+	bool awaiting_scroll_offset_update = false;
 	List<Connection> connections;
 
 	float lines_thickness = 2.0f;
@@ -194,7 +194,7 @@ private:
 				uint32_t type_a;
 				uint32_t type_b;
 			};
-			uint64_t key;
+			uint64_t key = 0;
 		};
 
 		bool operator<(const ConnType &p_type) const {
diff --git a/scene/gui/graph_node.cpp b/scene/gui/graph_node.cpp
index 6a83042b00..0ed3118673 100644
--- a/scene/gui/graph_node.cpp
+++ b/scene/gui/graph_node.cpp
@@ -850,12 +850,5 @@ void GraphNode::_bind_methods() {
 
 GraphNode::GraphNode() {
 	title_buf.instance();
-	overlay = OVERLAY_DISABLED;
-	show_close = false;
-	connpos_dirty = true;
 	set_mouse_filter(MOUSE_FILTER_STOP);
-	comment = false;
-	resizable = false;
-	resizing = false;
-	selected = false;
 }
diff --git a/scene/gui/graph_node.h b/scene/gui/graph_node.h
index cf66586e6b..1bc54dddb7 100644
--- a/scene/gui/graph_node.h
+++ b/scene/gui/graph_node.h
@@ -46,23 +46,14 @@ public:
 
 private:
 	struct Slot {
-		bool enable_left;
-		int type_left;
-		Color color_left;
-		bool enable_right;
-		int type_right;
-		Color color_right;
+		bool enable_left = false;
+		int type_left = 0;
+		Color color_left = Color(1, 1, 1, 1);
+		bool enable_right = false;
+		int type_right = 0;
+		Color color_right = Color(1, 1, 1, 1);
 		Ref<Texture2D> custom_slot_left;
 		Ref<Texture2D> custom_slot_right;
-
-		Slot() {
-			enable_left = false;
-			type_left = 0;
-			color_left = Color(1, 1, 1, 1);
-			enable_right = false;
-			type_right = 0;
-			color_right = Color(1, 1, 1, 1);
-		}
 	};
 
 	String title;
@@ -72,12 +63,12 @@ private:
 	String language;
 	TextDirection text_direction = TEXT_DIRECTION_AUTO;
 
-	bool show_close;
+	bool show_close = false;
 	Vector2 position_offset;
-	bool comment;
-	bool resizable;
+	bool comment = false;
+	bool resizable = false;
 
-	bool resizing;
+	bool resizing = false;
 	Vector2 resizing_from;
 	Vector2 resizing_from_size;
 
@@ -87,7 +78,7 @@ private:
 
 	struct ConnCache {
 		Vector2 pos;
-		int type;
+		int type = 0;
 		Color color;
 	};
 
@@ -96,16 +87,16 @@ private:
 
 	Map<int, Slot> slot_info;
 
-	bool connpos_dirty;
+	bool connpos_dirty = true;
 
 	void _connpos_update();
 	void _resort();
 	void _shape();
 
 	Vector2 drag_from;
-	bool selected;
+	bool selected = false;
 
-	Overlay overlay;
+	Overlay overlay = OVERLAY_DISABLED;
 
 protected:
 	void _gui_input(const Ref<InputEvent> &p_ev);
diff --git a/scene/gui/grid_container.cpp b/scene/gui/grid_container.cpp
index 11335db54a..541925a802 100644
--- a/scene/gui/grid_container.cpp
+++ b/scene/gui/grid_container.cpp
@@ -261,6 +261,4 @@ Size2 GridContainer::get_minimum_size() const {
 	return ms;
 }
 
-GridContainer::GridContainer() {
-	columns = 1;
-}
+GridContainer::GridContainer() {}
diff --git a/scene/gui/grid_container.h b/scene/gui/grid_container.h
index 8045c94b9a..9b43a5bc7e 100644
--- a/scene/gui/grid_container.h
+++ b/scene/gui/grid_container.h
@@ -36,7 +36,7 @@
 class GridContainer : public Container {
 	GDCLASS(GridContainer, Container);
 
-	int columns;
+	int columns = 1;
 
 protected:
 	void _notification(int p_what);
diff --git a/scene/gui/item_list.cpp b/scene/gui/item_list.cpp
index bd57817bd3..d76284e333 100644
--- a/scene/gui/item_list.cpp
+++ b/scene/gui/item_list.cpp
@@ -899,7 +899,7 @@ void ItemList::_notification(int p_what) {
 		}
 
 		if (shape_changed) {
-			float max_column_width = 0;
+			float max_column_width = 0.0;
 
 			//1- compute item minimum sizes
 			for (int i = 0; i < items.size(); i++) {
@@ -1615,34 +1615,12 @@ void ItemList::_bind_methods() {
 }
 
 ItemList::ItemList() {
-	current = -1;
-
-	select_mode = SELECT_SINGLE;
-	icon_mode = ICON_MODE_LEFT;
-
-	fixed_column_width = 0;
-	same_column_width = false;
-	max_text_lines = 1;
-	max_columns = 1;
-	auto_height = false;
-	auto_height_value = 0.0f;
-
 	scroll_bar = memnew(VScrollBar);
 	add_child(scroll_bar);
 
-	shape_changed = true;
 	scroll_bar->connect("value_changed", callable_mp(this, &ItemList::_scroll_changed));
 
 	set_focus_mode(FOCUS_ALL);
-	current_columns = 1;
-	search_time_msec = 0;
-	ensure_selected_visible = false;
-	defer_select_single = -1;
-	allow_rmb_select = false;
-	allow_reselect = false;
-	do_autoscroll_to_bottom = false;
-
-	icon_scale = 1.0f;
 	set_clip_contents(true);
 }
 
diff --git a/scene/gui/item_list.h b/scene/gui/item_list.h
index 4982a68071..86a0174a20 100644
--- a/scene/gui/item_list.h
+++ b/scene/gui/item_list.h
@@ -52,7 +52,7 @@ public:
 private:
 	struct Item {
 		Ref<Texture2D> icon;
-		bool icon_transposed;
+		bool icon_transposed = false;
 		Rect2i icon_region;
 		Color icon_modulate;
 		Ref<Texture2D> tag_icon;
@@ -62,10 +62,10 @@ private:
 		String language;
 		TextDirection text_direction = TEXT_DIRECTION_AUTO;
 
-		bool selectable;
-		bool selected;
-		bool disabled;
-		bool tooltip_enabled;
+		bool selectable = false;
+		bool selected = false;
+		bool disabled = false;
+		bool tooltip_enabled = false;
 		Variant metadata;
 		String tooltip;
 		Color custom_fg;
@@ -79,44 +79,44 @@ private:
 		bool operator<(const Item &p_another) const { return text < p_another.text; }
 	};
 
-	int current;
+	int current = -1;
 
-	bool shape_changed;
+	bool shape_changed = true;
 
-	bool ensure_selected_visible;
-	bool same_column_width;
+	bool ensure_selected_visible = false;
+	bool same_column_width = false;
 
-	bool auto_height;
-	float auto_height_value;
+	bool auto_height = false;
+	float auto_height_value = 0.0;
 
 	Vector<Item> items;
 	Vector<int> separators;
 
-	SelectMode select_mode;
-	IconMode icon_mode;
+	SelectMode select_mode = SELECT_SINGLE;
+	IconMode icon_mode = ICON_MODE_LEFT;
 	VScrollBar *scroll_bar;
 
-	uint64_t search_time_msec;
+	uint64_t search_time_msec = 0;
 	String search_string;
 
-	int current_columns;
-	int fixed_column_width;
-	int max_text_lines;
-	int max_columns;
+	int current_columns = 1;
+	int fixed_column_width = 0;
+	int max_text_lines = 1;
+	int max_columns = 1;
 
 	Size2 fixed_icon_size;
 
 	Size2 max_item_size_cache;
 
-	int defer_select_single;
+	int defer_select_single = -1;
 
-	bool allow_rmb_select;
+	bool allow_rmb_select = false;
 
-	bool allow_reselect;
+	bool allow_reselect = false;
 
-	real_t icon_scale;
+	real_t icon_scale = 1.0;
 
-	bool do_autoscroll_to_bottom;
+	bool do_autoscroll_to_bottom = false;
 
 	Array _get_items() const;
 	void _set_items(const Array &p_items);
diff --git a/scene/gui/label.cpp b/scene/gui/label.cpp
index 8fc40955f0..540d238b74 100644
--- a/scene/gui/label.cpp
+++ b/scene/gui/label.cpp
@@ -194,7 +194,7 @@ void Label::_notification(int p_what) {
 
 		style->draw(ci, Rect2(Point2(0, 0), get_size()));
 
-		float total_h = 0;
+		float total_h = 0.0;
 		int lines_visible = 0;
 
 		// Get number of lines to fit to the height.
@@ -391,7 +391,7 @@ int Label::get_visible_line_count() const {
 	Ref<StyleBox> style = get_theme_stylebox("normal");
 	int line_spacing = get_theme_constant("line_spacing");
 	int lines_visible = 0;
-	float total_h = 0;
+	float total_h = 0.0;
 	for (int64_t i = lines_skipped; i < lines_rid.size(); i++) {
 		total_h += TS->shaped_text_get_size(lines_rid[i]).y + font->get_spacing(Font::SPACING_TOP) + font->get_spacing(Font::SPACING_BOTTOM) + line_spacing;
 		if (total_h > (get_size().height - style->get_minimum_size().height + line_spacing)) {
diff --git a/scene/gui/label.h b/scene/gui/label.h
index 219c6af39e..032b4112e1 100644
--- a/scene/gui/label.h
+++ b/scene/gui/label.h
@@ -72,7 +72,7 @@ private:
 	Control::StructuredTextParser st_parser = STRUCTURED_TEXT_DEFAULT;
 	Array st_args;
 
-	float percent_visible = 1;
+	float percent_visible = 1.0;
 
 	int visible_chars = -1;
 	int lines_skipped = 0;
diff --git a/scene/gui/line_edit.cpp b/scene/gui/line_edit.cpp
index 51f780462f..087d33cd94 100644
--- a/scene/gui/line_edit.cpp
+++ b/scene/gui/line_edit.cpp
@@ -2264,9 +2264,6 @@ LineEdit::LineEdit() {
 	text_rid = TS->create_shaped_text();
 	_create_undo_state();
 
-	clear_button_status.press_attempt = false;
-	clear_button_status.pressing_inside = false;
-
 	deselect();
 	set_focus_mode(FOCUS_ALL);
 	set_default_cursor_shape(CURSOR_IBEAM);
diff --git a/scene/gui/line_edit.h b/scene/gui/line_edit.h
index 6db7a78f61..457a709f5b 100644
--- a/scene/gui/line_edit.h
+++ b/scene/gui/line_edit.h
@@ -94,7 +94,7 @@ private:
 	Point2 ime_selection;
 
 	RID text_rid;
-	float full_width = 0;
+	float full_width = 0.0;
 
 	bool selecting_enabled = true;
 
@@ -129,19 +129,19 @@ private:
 	Ref<Texture2D> right_icon;
 
 	struct Selection {
-		int begin;
-		int end;
-		int cursor_start;
-		bool enabled;
-		bool creating;
-		bool doubleclick;
-		bool drag_attempt;
+		int begin = 0;
+		int end = 0;
+		int cursor_start = 0;
+		bool enabled = false;
+		bool creating = false;
+		bool doubleclick = false;
+		bool drag_attempt = false;
 	} selection;
 
 	struct TextOperation {
-		int cursor_pos;
-		int scroll_offset;
-		int cached_width;
+		int cursor_pos = 0;
+		int scroll_offset = 0;
+		int cached_width = 0;
 		String text;
 	};
 	List<TextOperation> undo_stack;
diff --git a/scene/gui/link_button.cpp b/scene/gui/link_button.cpp
index 8e972438a5..cbcea13897 100644
--- a/scene/gui/link_button.cpp
+++ b/scene/gui/link_button.cpp
@@ -294,7 +294,6 @@ void LinkButton::_bind_methods() {
 
 LinkButton::LinkButton() {
 	text_buf.instance();
-	underline_mode = UNDERLINE_MODE_ALWAYS;
 	set_focus_mode(FOCUS_NONE);
 	set_default_cursor_shape(CURSOR_POINTING_HAND);
 }
diff --git a/scene/gui/link_button.h b/scene/gui/link_button.h
index 5ab6aba122..7eaa9f88b6 100644
--- a/scene/gui/link_button.h
+++ b/scene/gui/link_button.h
@@ -48,7 +48,7 @@ public:
 private:
 	String text;
 	Ref<TextLine> text_buf;
-	UnderlineMode underline_mode;
+	UnderlineMode underline_mode = UNDERLINE_MODE_ALWAYS;
 
 	Dictionary opentype_features;
 	String language;
diff --git a/scene/gui/menu_button.cpp b/scene/gui/menu_button.cpp
index 94cb5ef0f4..5acc7e808a 100644
--- a/scene/gui/menu_button.cpp
+++ b/scene/gui/menu_button.cpp
@@ -118,7 +118,6 @@ void MenuButton::set_disable_shortcuts(bool p_disabled) {
 }
 
 MenuButton::MenuButton() {
-	switch_on_hover = false;
 	set_flat(true);
 	set_toggle_mode(true);
 	set_disable_shortcuts(false);
diff --git a/scene/gui/menu_button.h b/scene/gui/menu_button.h
index cd4ed5bcb2..fd9ae6021e 100644
--- a/scene/gui/menu_button.h
+++ b/scene/gui/menu_button.h
@@ -37,9 +37,9 @@
 class MenuButton : public Button {
 	GDCLASS(MenuButton, Button);
 
-	bool clicked;
-	bool switch_on_hover;
-	bool disable_shortcuts;
+	bool clicked = false;
+	bool switch_on_hover = false;
+	bool disable_shortcuts = false;
 	PopupMenu *popup;
 
 	Array _get_items() const;
diff --git a/scene/gui/nine_patch_rect.cpp b/scene/gui/nine_patch_rect.cpp
index c274eb5c10..64fff5c031 100644
--- a/scene/gui/nine_patch_rect.cpp
+++ b/scene/gui/nine_patch_rect.cpp
@@ -174,16 +174,7 @@ NinePatchRect::AxisStretchMode NinePatchRect::get_v_axis_stretch_mode() const {
 }
 
 NinePatchRect::NinePatchRect() {
-	margin[SIDE_LEFT] = 0;
-	margin[SIDE_RIGHT] = 0;
-	margin[SIDE_BOTTOM] = 0;
-	margin[SIDE_TOP] = 0;
-
 	set_mouse_filter(MOUSE_FILTER_IGNORE);
-	draw_center = true;
-
-	axis_h = AXIS_STRETCH_MODE_STRETCH;
-	axis_v = AXIS_STRETCH_MODE_STRETCH;
 }
 
 NinePatchRect::~NinePatchRect() {
diff --git a/scene/gui/nine_patch_rect.h b/scene/gui/nine_patch_rect.h
index fcf25018aa..f9a3f31fe5 100644
--- a/scene/gui/nine_patch_rect.h
+++ b/scene/gui/nine_patch_rect.h
@@ -43,12 +43,13 @@ public:
 		AXIS_STRETCH_MODE_TILE_FIT,
 	};
 
-	bool draw_center;
-	int margin[4];
+	bool draw_center = true;
+	int margin[4] = {};
 	Rect2 region_rect;
 	Ref<Texture2D> texture;
 
-	AxisStretchMode axis_h, axis_v;
+	AxisStretchMode axis_h = AXIS_STRETCH_MODE_STRETCH;
+	AxisStretchMode axis_v = AXIS_STRETCH_MODE_STRETCH;
 
 protected:
 	void _notification(int p_what);
diff --git a/scene/gui/option_button.cpp b/scene/gui/option_button.cpp
index e4c1f94b31..e52b6917be 100644
--- a/scene/gui/option_button.cpp
+++ b/scene/gui/option_button.cpp
@@ -336,7 +336,6 @@ void OptionButton::_bind_methods() {
 }
 
 OptionButton::OptionButton() {
-	current = -1;
 	set_toggle_mode(true);
 	set_text_align(ALIGN_LEFT);
 	if (is_layout_rtl()) {
diff --git a/scene/gui/option_button.h b/scene/gui/option_button.h
index 9cb296baa9..d846e395ad 100644
--- a/scene/gui/option_button.h
+++ b/scene/gui/option_button.h
@@ -38,7 +38,7 @@ class OptionButton : public Button {
 	GDCLASS(OptionButton, Button);
 
 	PopupMenu *popup;
-	int current;
+	int current = -1;
 
 	void _focused(int p_which);
 	void _selected(int p_which);
diff --git a/scene/gui/popup_menu.cpp b/scene/gui/popup_menu.cpp
index b2ebb91500..835f4c432f 100644
--- a/scene/gui/popup_menu.cpp
+++ b/scene/gui/popup_menu.cpp
@@ -52,8 +52,8 @@ Size2 PopupMenu::_get_contents_minimum_size() const {
 	Size2 minsize = get_theme_stylebox("panel")->get_minimum_size(); // Accounts for margin in the margin container
 	minsize.x += scroll_container->get_v_scrollbar()->get_size().width * 2; // Adds a buffer so that the scrollbar does not render over the top of content
 
-	float max_w = 0;
-	float icon_w = 0;
+	float max_w = 0.0;
+	float icon_w = 0.0;
 	int check_w = MAX(get_theme_icon("checked")->get_width(), get_theme_icon("radio_checked")->get_width()) + hseparation;
 	int accel_max_w = 0;
 	bool has_check = false;
@@ -1656,19 +1656,6 @@ PopupMenu::PopupMenu() {
 
 	connect("window_input", callable_mp(this, &PopupMenu::_gui_input));
 
-	mouse_over = -1;
-	submenu_over = -1;
-	initial_button_mask = 0;
-	during_grabbed_click = false;
-
-	allow_search = true;
-	search_time_msec = 0;
-	search_string = "";
-
-	set_hide_on_item_selection(true);
-	set_hide_on_checkable_item_selection(true);
-	set_hide_on_multistate_item_selection(false);
-
 	submenu_timer = memnew(Timer);
 	submenu_timer->set_wait_time(0.3);
 	submenu_timer->set_one_shot(true);
diff --git a/scene/gui/popup_menu.h b/scene/gui/popup_menu.h
index c050e61d50..184be42e95 100644
--- a/scene/gui/popup_menu.h
+++ b/scene/gui/popup_menu.h
@@ -51,28 +51,28 @@ class PopupMenu : public Popup {
 		String language;
 		Control::TextDirection text_direction = Control::TEXT_DIRECTION_AUTO;
 
-		bool checked;
+		bool checked = false;
 		enum {
 			CHECKABLE_TYPE_NONE,
 			CHECKABLE_TYPE_CHECK_BOX,
 			CHECKABLE_TYPE_RADIO_BUTTON,
 		} checkable_type;
-		int max_states;
-		int state;
-		bool separator;
-		bool disabled;
-		bool dirty;
-		int id;
+		int max_states = 0;
+		int state = 0;
+		bool separator = false;
+		bool disabled = false;
+		bool dirty = true;
+		int id = 0;
 		Variant metadata;
 		String submenu;
 		String tooltip;
-		uint32_t accel;
-		int _ofs_cache;
-		int _height_cache;
-		int h_ofs;
+		uint32_t accel = 0;
+		int _ofs_cache = 0;
+		int _height_cache = 0;
+		int h_ofs = 0;
 		Ref<Shortcut> shortcut;
-		bool shortcut_is_global;
-		bool shortcut_is_disabled;
+		bool shortcut_is_global = false;
+		bool shortcut_is_disabled = false;
 
 		// Returns (0,0) if icon is null.
 		Size2 get_icon_size() const {
@@ -82,19 +82,7 @@ class PopupMenu : public Popup {
 		Item() {
 			text_buf.instance();
 			accel_text_buf.instance();
-			dirty = true;
-			checked = false;
 			checkable_type = CHECKABLE_TYPE_NONE;
-			separator = false;
-			max_states = 0;
-			state = 0;
-			accel = 0;
-			disabled = false;
-			_ofs_cache = 0;
-			_height_cache = 0;
-			h_ofs = 0;
-			shortcut_is_global = false;
-			shortcut_is_disabled = false;
 		}
 	};
 
@@ -104,10 +92,10 @@ class PopupMenu : public Popup {
 	Timer *submenu_timer;
 	List<Rect2> autohide_areas;
 	Vector<Item> items;
-	int initial_button_mask;
-	bool during_grabbed_click;
-	int mouse_over;
-	int submenu_over;
+	int initial_button_mask = 0;
+	bool during_grabbed_click = false;
+	int mouse_over = -1;
+	int submenu_over = -1;
 	Rect2 parent_rect;
 	String _get_accel_text(const Item &p_item) const;
 	int _get_mouse_over(const Point2 &p_over) const;
@@ -123,9 +111,9 @@ class PopupMenu : public Popup {
 	void _submenu_timeout();
 
 	uint64_t popup_time_msec = 0;
-	bool hide_on_item_selection;
-	bool hide_on_checkable_item_selection;
-	bool hide_on_multistate_item_selection;
+	bool hide_on_item_selection = true;
+	bool hide_on_checkable_item_selection = true;
+	bool hide_on_multistate_item_selection = false;
 	Vector2 moved;
 
 	Array _get_items() const;
@@ -136,9 +124,9 @@ class PopupMenu : public Popup {
 	void _ref_shortcut(Ref<Shortcut> p_sc);
 	void _unref_shortcut(Ref<Shortcut> p_sc);
 
-	bool allow_search;
-	uint64_t search_time_msec;
-	String search_string;
+	bool allow_search = true;
+	uint64_t search_time_msec = 0;
+	String search_string = "";
 
 	MarginContainer *margin_container;
 	ScrollContainer *scroll_container;
diff --git a/scene/gui/progress_bar.cpp b/scene/gui/progress_bar.cpp
index 1b33cc6ffb..63174b2d7f 100644
--- a/scene/gui/progress_bar.cpp
+++ b/scene/gui/progress_bar.cpp
@@ -98,5 +98,4 @@ void ProgressBar::_bind_methods() {
 ProgressBar::ProgressBar() {
 	set_v_size_flags(0);
 	set_step(0.01);
-	percent_visible = true;
 }
diff --git a/scene/gui/progress_bar.h b/scene/gui/progress_bar.h
index 3317846108..fb6060d932 100644
--- a/scene/gui/progress_bar.h
+++ b/scene/gui/progress_bar.h
@@ -36,7 +36,7 @@
 class ProgressBar : public Range {
 	GDCLASS(ProgressBar, Range);
 
-	bool percent_visible;
+	bool percent_visible = true;
 
 protected:
 	void _notification(int p_what);
diff --git a/scene/gui/range.cpp b/scene/gui/range.cpp
index 1e33ab0758..86dc583f85 100644
--- a/scene/gui/range.cpp
+++ b/scene/gui/range.cpp
@@ -314,17 +314,7 @@ bool Range::is_lesser_allowed() const {
 
 Range::Range() {
 	shared = memnew(Shared);
-	shared->min = 0;
-	shared->max = 100;
-	shared->val = 0;
-	shared->step = 1;
-	shared->page = 0;
 	shared->owners.insert(this);
-	shared->exp_ratio = false;
-	shared->allow_greater = false;
-	shared->allow_lesser = false;
-
-	_rounded_values = false;
 }
 
 Range::~Range() {
diff --git a/scene/gui/range.h b/scene/gui/range.h
index 68ff46bd74..1072a109c6 100644
--- a/scene/gui/range.h
+++ b/scene/gui/range.h
@@ -37,11 +37,14 @@ class Range : public Control {
 	GDCLASS(Range, Control);
 
 	struct Shared {
-		double val, min, max;
-		double step, page;
-		bool exp_ratio;
-		bool allow_greater;
-		bool allow_lesser;
+		double val = 0.0;
+		double min = 0.0;
+		double max = 100.0;
+		double step = 1.0;
+		double page = 0.0;
+		bool exp_ratio = false;
+		bool allow_greater = false;
+		bool allow_lesser = false;
 		Set<Range *> owners;
 		void emit_value_changed();
 		void emit_changed(const char *p_what = "");
@@ -62,7 +65,7 @@ protected:
 
 	static void _bind_methods();
 
-	bool _rounded_values;
+	bool _rounded_values = false;
 
 public:
 	void set_value(double p_val);
diff --git a/scene/gui/rich_text_label.cpp b/scene/gui/rich_text_label.cpp
index 6d5905aedc..158f433967 100644
--- a/scene/gui/rich_text_label.cpp
+++ b/scene/gui/rich_text_label.cpp
@@ -314,7 +314,7 @@ void RichTextLabel::_resize_line(ItemFrame *p_frame, int p_line, const Ref<Font>
 				table->rows.clear();
 
 				Vector2 offset;
-				float row_height = 0;
+				float row_height = 0.0;
 
 				for (List<Item *>::Element *E = table->subitems.front(); E; E = E->next()) {
 					ERR_CONTINUE(E->get()->type != ITEM_FRAME); // Children should all be frames.
@@ -553,7 +553,7 @@ void RichTextLabel::_shape_line(ItemFrame *p_frame, int p_line, const Ref<Font>
 				table->rows.clear();
 
 				Vector2 offset;
-				float row_height = 0;
+				float row_height = 0.0;
 
 				for (List<Item *>::Element *E = table->subitems.front(); E; E = E->next()) {
 					ERR_CONTINUE(E->get()->type != ITEM_FRAME); // Children should all be frames.
@@ -1847,7 +1847,7 @@ int RichTextLabel::_find_list(Item *p_item, Vector<int> &r_index, Vector<ItemLis
 int RichTextLabel::_find_margin(Item *p_item, const Ref<Font> &p_base_font, int p_base_font_size) {
 	Item *item = p_item;
 
-	float margin = 0;
+	float margin = 0.0;
 
 	while (item) {
 		if (item->type == ITEM_INDENT) {
@@ -4066,19 +4066,6 @@ RichTextLabel::RichTextLabel() {
 	main->first_invalid_line = 0;
 	main->first_resized_line = 0;
 	current_frame = main;
-	tab_size = 4;
-	default_align = ALIGN_LEFT;
-	underline_meta = true;
-	meta_hovering = nullptr;
-	override_selected_font_color = false;
-
-	scroll_visible = false;
-	scroll_follow = false;
-	scroll_following = false;
-	updating_scroll = false;
-	scroll_active = true;
-	scroll_w = 0;
-	scroll_updated = false;
 
 	vscroll = memnew(VScrollBar);
 	add_child(vscroll);
@@ -4090,19 +4077,6 @@ RichTextLabel::RichTextLabel() {
 	vscroll->connect("value_changed", callable_mp(this, &RichTextLabel::_scroll_changed));
 	vscroll->set_step(1);
 	vscroll->hide();
-	use_bbcode = false;
-
-	selection.click_frame = nullptr;
-	selection.click_item = nullptr;
-	selection.active = false;
-	selection.enabled = false;
-
-	visible_characters = -1;
-	percent_visible = 1;
-	visible_line_count = 0;
-
-	fixed_width = -1;
-	fit_content_height = false;
 
 	set_clip_contents(true);
 }
diff --git a/scene/gui/rich_text_label.h b/scene/gui/rich_text_label.h
index 037839dac7..84936221d5 100644
--- a/scene/gui/rich_text_label.h
+++ b/scene/gui/rich_text_label.h
@@ -147,9 +147,9 @@ private:
 	struct ItemDropcap : public Item {
 		String text;
 		Ref<Font> font;
-		int font_size;
+		int font_size = 0;
 		Color color;
-		int ol_size;
+		int ol_size = 0;
 		Color ol_color;
 		Rect2 dropcap_margins;
 		ItemDropcap() { type = ITEM_DROPCAP; }
@@ -232,11 +232,11 @@ private:
 
 	struct ItemTable : public Item {
 		struct Column {
-			bool expand;
-			int expand_ratio;
-			int min_width;
-			int max_width;
-			int width;
+			bool expand = false;
+			int expand_ratio = 0;
+			int min_width = 0;
+			int max_width = 0;
+			int width = 0;
 		};
 
 		Vector<Column> columns;
@@ -322,31 +322,31 @@ private:
 		}
 	};
 
-	ItemFrame *main;
-	Item *current;
-	ItemFrame *current_frame;
+	ItemFrame *main = nullptr;
+	Item *current = nullptr;
+	ItemFrame *current_frame = nullptr;
 
-	VScrollBar *vscroll;
+	VScrollBar *vscroll = nullptr;
 
-	bool scroll_visible;
-	bool scroll_follow;
-	bool scroll_following;
-	bool scroll_active;
-	int scroll_w;
-	bool scroll_updated;
-	bool updating_scroll;
+	bool scroll_visible = false;
+	bool scroll_follow = false;
+	bool scroll_following = false;
+	bool scroll_active = true;
+	int scroll_w = 0;
+	bool scroll_updated = false;
+	bool updating_scroll = false;
 	int current_idx = 1;
 	int current_char_ofs = 0;
-	int visible_paragraph_count;
-	int visible_line_count;
+	int visible_paragraph_count = 0;
+	int visible_line_count = 0;
 
-	int tab_size;
-	bool underline_meta;
-	bool override_selected_font_color;
+	int tab_size = 4;
+	bool underline_meta = true;
+	bool override_selected_font_color = false;
 
-	Align default_align;
+	Align default_align = ALIGN_LEFT;
 
-	ItemMeta *meta_hovering;
+	ItemMeta *meta_hovering = nullptr;
 	Variant current_meta;
 
 	Vector<Ref<RichTextEffect>> custom_effects;
@@ -363,29 +363,29 @@ private:
 	Array st_args;
 
 	struct Selection {
-		ItemFrame *click_frame;
-		int click_line;
-		Item *click_item;
-		int click_char;
-
-		ItemFrame *from_frame;
-		int from_line;
-		Item *from_item;
-		int from_char;
-
-		ItemFrame *to_frame;
-		int to_line;
-		Item *to_item;
-		int to_char;
-
-		bool active; // anything selected? i.e. from, to, etc. valid?
-		bool enabled; // allow selections?
+		ItemFrame *click_frame = nullptr;
+		int click_line = 0;
+		Item *click_item = nullptr;
+		int click_char = 0;
+
+		ItemFrame *from_frame = nullptr;
+		int from_line = 0;
+		Item *from_item = nullptr;
+		int from_char = 0;
+
+		ItemFrame *to_frame = nullptr;
+		int to_line = 0;
+		Item *to_item = nullptr;
+		int to_char = 0;
+
+		bool active = false; // anything selected? i.e. from, to, etc. valid?
+		bool enabled = false; // allow selections?
 	};
 
 	Selection selection;
 
-	int visible_characters;
-	float percent_visible;
+	int visible_characters = -1;
+	float percent_visible = 1.0;
 
 	void _find_click(ItemFrame *p_frame, const Point2i &p_click, ItemFrame **r_click_frame = nullptr, int *r_click_line = nullptr, Item **r_click_item = nullptr, int *r_click_char = nullptr, bool *r_outside = nullptr);
 
@@ -434,12 +434,12 @@ private:
 	Ref<RichTextEffect> _get_custom_effect_by_code(String p_bbcode_identifier);
 	virtual Dictionary parse_expressions_for_values(Vector<String> p_expressions);
 
-	bool use_bbcode;
+	bool use_bbcode = false;
 	String bbcode;
 
-	int fixed_width;
+	int fixed_width = -1;
 
-	bool fit_content_height;
+	bool fit_content_height = false;
 
 protected:
 	void _notification(int p_what);
diff --git a/scene/gui/scroll_bar.cpp b/scene/gui/scroll_bar.cpp
index 79a0de35fc..f2516e76a5 100644
--- a/scene/gui/scroll_bar.cpp
+++ b/scene/gui/scroll_bar.cpp
@@ -434,7 +434,7 @@ double ScrollBar::get_area_size() const {
 }
 
 double ScrollBar::get_area_offset() const {
-	double ofs = 0;
+	double ofs = 0.0;
 
 	if (orientation == VERTICAL) {
 		ofs += get_theme_stylebox("hscroll")->get_margin(SIDE_TOP);
diff --git a/scene/gui/scroll_bar.h b/scene/gui/scroll_bar.h
index 7dd71cc269..24b3b33e82 100644
--- a/scene/gui/scroll_bar.h
+++ b/scene/gui/scroll_bar.h
@@ -47,14 +47,14 @@ class ScrollBar : public Range {
 
 	Orientation orientation;
 	Size2 size;
-	float custom_step = -1;
+	float custom_step = -1.0;
 
 	HighlightStatus highlight = HIGHLIGHT_NONE;
 
 	struct Drag {
 		bool active = false;
-		float pos_at_click = 0;
-		float value_at_click = 0;
+		float pos_at_click = 0.0;
+		float value_at_click = 0.0;
 	} drag;
 
 	double get_grabber_size() const;
@@ -73,14 +73,14 @@ class ScrollBar : public Range {
 	Vector2 drag_node_accum;
 	Vector2 drag_node_from;
 	Vector2 last_drag_node_accum;
-	float last_drag_node_time;
-	float time_since_motion;
+	float last_drag_node_time = 0.0;
+	float time_since_motion = 0.0;
 	bool drag_node_touching = false;
 	bool drag_node_touching_deaccel = false;
-	bool click_handled;
+	bool click_handled = false;
 
 	bool scrolling = false;
-	double target_scroll = 0;
+	double target_scroll = 0.0;
 	bool smooth_scroll_enabled = false;
 
 	void _drag_node_exit();
diff --git a/scene/gui/scroll_container.cpp b/scene/gui/scroll_container.cpp
index 52feb2ab23..411891ece8 100644
--- a/scene/gui/scroll_container.cpp
+++ b/scene/gui/scroll_container.cpp
@@ -244,11 +244,11 @@ void ScrollContainer::_ensure_focused_visible(Control *p_control) {
 	if (is_a_parent_of(p_control)) {
 		Rect2 global_rect = get_global_rect();
 		Rect2 other_rect = p_control->get_global_rect();
-		float right_margin = 0;
+		float right_margin = 0.0;
 		if (v_scroll->is_visible()) {
 			right_margin += v_scroll->get_size().x;
 		}
-		float bottom_margin = 0;
+		float bottom_margin = 0.0;
 		if (h_scroll->is_visible()) {
 			bottom_margin += h_scroll->get_size().y;
 		}
@@ -624,15 +624,7 @@ ScrollContainer::ScrollContainer() {
 	add_child(v_scroll);
 	v_scroll->connect("value_changed", callable_mp(this, &ScrollContainer::_scroll_moved));
 
-	drag_speed = Vector2();
-	drag_touching = false;
-	drag_touching_deaccel = false;
-	beyond_deadzone = false;
-	scroll_h = true;
-	scroll_v = true;
-
 	deadzone = GLOBAL_GET("gui/common/default_scroll_deadzone");
-	follow_focus = false;
 
 	set_clip_contents(true);
 };
diff --git a/scene/gui/scroll_container.h b/scene/gui/scroll_container.h
index 7e32cbed1c..9d3ce39345 100644
--- a/scene/gui/scroll_container.h
+++ b/scene/gui/scroll_container.h
@@ -50,18 +50,18 @@ class ScrollContainer : public Container {
 	Vector2 drag_accum;
 	Vector2 drag_from;
 	Vector2 last_drag_accum;
-	float last_drag_time;
-	float time_since_motion;
-	bool drag_touching;
-	bool drag_touching_deaccel;
-	bool click_handled;
-	bool beyond_deadzone;
-
-	bool scroll_h;
-	bool scroll_v;
-
-	int deadzone;
-	bool follow_focus;
+	float last_drag_time = 0.0;
+	float time_since_motion = 0.0;
+	bool drag_touching = false;
+	bool drag_touching_deaccel = false;
+	bool click_handled = false;
+	bool beyond_deadzone = false;
+
+	bool scroll_h = true;
+	bool scroll_v = true;
+
+	int deadzone = 0;
+	bool follow_focus = false;
 
 	void _cancel_drag();
 
diff --git a/scene/gui/separator.h b/scene/gui/separator.h
index 1ac0f2c503..77162c68fa 100644
--- a/scene/gui/separator.h
+++ b/scene/gui/separator.h
@@ -36,7 +36,7 @@ class Separator : public Control {
 	GDCLASS(Separator, Control);
 
 protected:
-	Orientation orientation;
+	Orientation orientation = Orientation::HORIZONTAL;
 	void _notification(int p_what);
 
 public:
diff --git a/scene/gui/slider.cpp b/scene/gui/slider.cpp
index 0edf1856de..8b07299e30 100644
--- a/scene/gui/slider.cpp
+++ b/scene/gui/slider.cpp
@@ -269,12 +269,5 @@ void Slider::_bind_methods() {
 
 Slider::Slider(Orientation p_orientation) {
 	orientation = p_orientation;
-	mouse_inside = false;
-	grab.active = false;
-	ticks = 0;
-	ticks_on_borders = false;
-	custom_step = -1;
-	editable = true;
-	scrollable = true;
 	set_focus_mode(FOCUS_ALL);
 }
diff --git a/scene/gui/slider.h b/scene/gui/slider.h
index 292931b7b5..65a4036cd1 100644
--- a/scene/gui/slider.h
+++ b/scene/gui/slider.h
@@ -37,23 +37,23 @@ class Slider : public Range {
 	GDCLASS(Slider, Range);
 
 	struct Grab {
-		int pos;
-		float uvalue;
-		bool active;
+		int pos = 0;
+		float uvalue = 0.0;
+		bool active = false;
 	} grab;
 
-	int ticks;
-	bool mouse_inside;
+	int ticks = 0;
+	bool mouse_inside = false;
 	Orientation orientation;
-	float custom_step;
-	bool editable;
-	bool scrollable;
+	float custom_step = -1.0;
+	bool editable = true;
+	bool scrollable = true;
 
 protected:
 	void _gui_input(Ref<InputEvent> p_event);
 	void _notification(int p_what);
 	static void _bind_methods();
-	bool ticks_on_borders;
+	bool ticks_on_borders = false;
 
 public:
 	virtual Size2 get_minimum_size() const override;
diff --git a/scene/gui/spin_box.cpp b/scene/gui/spin_box.cpp
index 32c878205e..2c9720e4b6 100644
--- a/scene/gui/spin_box.cpp
+++ b/scene/gui/spin_box.cpp
@@ -268,7 +268,6 @@ void SpinBox::_bind_methods() {
 }
 
 SpinBox::SpinBox() {
-	last_w = 0;
 	line_edit = memnew(LineEdit);
 	add_child(line_edit);
 
diff --git a/scene/gui/spin_box.h b/scene/gui/spin_box.h
index a4e3d644e2..4c3adf30e8 100644
--- a/scene/gui/spin_box.h
+++ b/scene/gui/spin_box.h
@@ -39,7 +39,7 @@ class SpinBox : public Range {
 	GDCLASS(SpinBox, Range);
 
 	LineEdit *line_edit;
-	int last_w;
+	int last_w = 0;
 
 	Timer *range_click_timer;
 	void _range_click_timeout();
@@ -52,11 +52,11 @@ class SpinBox : public Range {
 	void _line_edit_input(const Ref<InputEvent> &p_event);
 
 	struct Drag {
-		float base_val = 0;
+		float base_val = 0.0;
 		bool allowed = false;
 		bool enabled = false;
 		Vector2 capture_pos;
-		float diff_y = 0;
+		float diff_y = 0.0;
 	} drag;
 
 	void _line_edit_focus_exit();
diff --git a/scene/gui/split_container.cpp b/scene/gui/split_container.cpp
index d6f2df1d8c..1a7bd8304e 100644
--- a/scene/gui/split_container.cpp
+++ b/scene/gui/split_container.cpp
@@ -359,12 +359,5 @@ void SplitContainer::_bind_methods() {
 }
 
 SplitContainer::SplitContainer(bool p_vertical) {
-	mouse_inside = false;
-	split_offset = 0;
-	should_clamp_split_offset = false;
-	middle_sep = 0;
 	vertical = p_vertical;
-	dragging = false;
-	collapsed = false;
-	dragger_visibility = DRAGGER_VISIBLE;
 }
diff --git a/scene/gui/split_container.h b/scene/gui/split_container.h
index 46a6792206..6cb94d6ecf 100644
--- a/scene/gui/split_container.h
+++ b/scene/gui/split_container.h
@@ -44,16 +44,16 @@ public:
 	};
 
 private:
-	bool should_clamp_split_offset;
-	int split_offset;
-	int middle_sep;
-	bool vertical;
-	bool dragging;
-	int drag_from;
-	int drag_ofs;
-	bool collapsed;
-	DraggerVisibility dragger_visibility;
-	bool mouse_inside;
+	bool should_clamp_split_offset = false;
+	int split_offset = 0;
+	int middle_sep = 0;
+	bool vertical = false;
+	bool dragging = false;
+	int drag_from = 0;
+	int drag_ofs = 0;
+	bool collapsed = false;
+	DraggerVisibility dragger_visibility = DRAGGER_VISIBLE;
+	bool mouse_inside = false;
 
 	Control *_getch(int p_idx) const;
 
diff --git a/scene/gui/subviewport_container.cpp b/scene/gui/subviewport_container.cpp
index 68eef0f96b..8ffdd269a4 100644
--- a/scene/gui/subviewport_container.cpp
+++ b/scene/gui/subviewport_container.cpp
@@ -203,8 +203,6 @@ void SubViewportContainer::_bind_methods() {
 }
 
 SubViewportContainer::SubViewportContainer() {
-	stretch = false;
-	shrink = 1;
 	set_process_input(true);
 	set_process_unhandled_input(true);
 }
diff --git a/scene/gui/subviewport_container.h b/scene/gui/subviewport_container.h
index 91fc29d377..77cf4c16b3 100644
--- a/scene/gui/subviewport_container.h
+++ b/scene/gui/subviewport_container.h
@@ -36,8 +36,8 @@
 class SubViewportContainer : public Container {
 	GDCLASS(SubViewportContainer, Container);
 
-	bool stretch;
-	int shrink;
+	bool stretch = false;
+	int shrink = 1;
 
 protected:
 	void _notification(int p_what);
diff --git a/scene/gui/tab_container.cpp b/scene/gui/tab_container.cpp
index 5acc789fbb..3377ac62e6 100644
--- a/scene/gui/tab_container.cpp
+++ b/scene/gui/tab_container.cpp
@@ -1243,20 +1243,5 @@ void TabContainer::_bind_methods() {
 }
 
 TabContainer::TabContainer() {
-	first_tab_cache = 0;
-	last_tab_cache = 0;
-	buttons_visible_cache = false;
-	menu_hovered = false;
-	highlight_arrow = -1;
-	tabs_ofs_cache = 0;
-	current = 0;
-	previous = 0;
-	align = ALIGN_CENTER;
-	tabs_visible = true;
-	all_tabs_in_front = false;
-	drag_to_rearrange_enabled = false;
-	tabs_rearrange_group = -1;
-	use_hidden_tabs_for_min_size = false;
-
 	connect("mouse_exited", callable_mp(this, &TabContainer::_on_mouse_exited));
 }
diff --git a/scene/gui/tab_container.h b/scene/gui/tab_container.h
index 58742c5be8..4ed5255729 100644
--- a/scene/gui/tab_container.h
+++ b/scene/gui/tab_container.h
@@ -46,23 +46,23 @@ public:
 	};
 
 private:
-	int first_tab_cache;
-	int tabs_ofs_cache;
-	int last_tab_cache;
-	int current;
-	int previous;
-	bool tabs_visible;
-	bool all_tabs_in_front;
-	bool buttons_visible_cache;
-	bool menu_hovered;
-	int highlight_arrow;
-	TabAlign align;
+	int first_tab_cache = 0;
+	int tabs_ofs_cache = 0;
+	int last_tab_cache = 0;
+	int current = 0;
+	int previous = 0;
+	bool tabs_visible = true;
+	bool all_tabs_in_front = false;
+	bool buttons_visible_cache = false;
+	bool menu_hovered = false;
+	int highlight_arrow = -1;
+	TabAlign align = ALIGN_CENTER;
 	Control *_get_tab(int p_idx) const;
 	int _get_top_margin() const;
 	mutable ObjectID popup_obj_id;
-	bool drag_to_rearrange_enabled;
-	bool use_hidden_tabs_for_min_size;
-	int tabs_rearrange_group;
+	bool drag_to_rearrange_enabled = false;
+	bool use_hidden_tabs_for_min_size = false;
+	int tabs_rearrange_group = -1;
 
 	Vector<Ref<TextLine>> text_buf;
 	Vector<Control *> _get_tabs() const;
diff --git a/scene/gui/tabs.cpp b/scene/gui/tabs.cpp
index c156b1e6f8..2ad743e7b4 100644
--- a/scene/gui/tabs.cpp
+++ b/scene/gui/tabs.cpp
@@ -1137,27 +1137,5 @@ void Tabs::_bind_methods() {
 }
 
 Tabs::Tabs() {
-	current = 0;
-	previous = 0;
-	tab_align = ALIGN_CENTER;
-	rb_hover = -1;
-	rb_pressing = false;
-	highlight_arrow = -1;
-
-	cb_hover = -1;
-	cb_pressing = false;
-	cb_displaypolicy = CLOSE_BUTTON_SHOW_NEVER;
-	offset = 0;
-	max_drawn_tab = 0;
-
-	select_with_rmb = false;
-
-	min_width = 0;
-	scrolling_enabled = true;
-	buttons_visible = false;
-	hover = -1;
-	drag_to_rearrange_enabled = false;
-	tabs_rearrange_group = -1;
-
 	connect("mouse_exited", callable_mp(this, &Tabs::_on_mouse_exited));
 }
diff --git a/scene/gui/tabs.h b/scene/gui/tabs.h
index 4396981004..86877f4d80 100644
--- a/scene/gui/tabs.h
+++ b/scene/gui/tabs.h
@@ -63,42 +63,42 @@ private:
 
 		Ref<TextLine> text_buf;
 		Ref<Texture2D> icon;
-		int ofs_cache;
-		bool disabled;
-		int size_cache;
-		int size_text;
-		int x_cache;
-		int x_size_cache;
+		int ofs_cache = 0;
+		bool disabled = false;
+		int size_cache = 0;
+		int size_text = 0;
+		int x_cache = 0;
+		int x_size_cache = 0;
 
 		Ref<Texture2D> right_button;
 		Rect2 rb_rect;
 		Rect2 cb_rect;
 	};
 
-	int offset;
-	int max_drawn_tab;
-	int highlight_arrow;
-	bool buttons_visible;
-	bool missing_right;
+	int offset = 0;
+	int max_drawn_tab = 0;
+	int highlight_arrow = -1;
+	bool buttons_visible = false;
+	bool missing_right = false;
 	Vector<Tab> tabs;
-	int current;
-	int previous;
+	int current = 0;
+	int previous = 0;
 	int _get_top_margin() const;
-	TabAlign tab_align;
-	int rb_hover;
-	bool rb_pressing;
+	TabAlign tab_align = ALIGN_CENTER;
+	int rb_hover = -1;
+	bool rb_pressing = false;
 
-	bool select_with_rmb;
+	bool select_with_rmb = false;
 
-	int cb_hover;
-	bool cb_pressing;
-	CloseButtonDisplayPolicy cb_displaypolicy;
+	int cb_hover = -1;
+	bool cb_pressing = false;
+	CloseButtonDisplayPolicy cb_displaypolicy = CLOSE_BUTTON_SHOW_NEVER;
 
-	int hover; // Hovered tab.
-	int min_width;
-	bool scrolling_enabled;
-	bool drag_to_rearrange_enabled;
-	int tabs_rearrange_group;
+	int hover = -1; // Hovered tab.
+	int min_width = 0;
+	bool scrolling_enabled = true;
+	bool drag_to_rearrange_enabled = false;
+	int tabs_rearrange_group = -1;
 
 	int get_tab_width(int p_idx) const;
 	void _ensure_no_over_offset();
diff --git a/scene/gui/text_edit.cpp b/scene/gui/text_edit.cpp
index 9285314abe..44c32d4e42 100644
--- a/scene/gui/text_edit.cpp
+++ b/scene/gui/text_edit.cpp
@@ -6128,7 +6128,7 @@ double TextEdit::get_scroll_pos_for_line(int p_line, int p_wrap_index) const {
 	}
 
 	// Count the number of visible lines up to this line.
-	double new_line_scroll_pos = 0;
+	double new_line_scroll_pos = 0.0;
 	int to = CLAMP(p_line, 0, text.size() - 1);
 	for (int i = 0; i < to; i++) {
 		if (!text.is_hidden(i)) {
@@ -7205,23 +7205,11 @@ void TextEdit::_bind_methods() {
 }
 
 TextEdit::TextEdit() {
-	setting_row = false;
-	draw_tabs = false;
-	draw_spaces = false;
-	override_selected_font_color = false;
-	draw_caret = true;
-	max_chars = 0;
 	clear();
-	wrap_enabled = false;
-	wrap_at = 0;
-	wrap_right_offset = 10;
 	set_focus_mode(FOCUS_ALL);
 	_update_caches();
-	cache.line_spacing = 1;
-	cache.font_size = 16;
 	set_default_cursor_shape(CURSOR_IBEAM);
 
-	indent_size = 4;
 	text.set_indent_size(indent_size);
 	text.clear();
 
@@ -7231,31 +7219,16 @@ TextEdit::TextEdit() {
 	add_child(h_scroll);
 	add_child(v_scroll);
 
-	updating_scrolls = false;
-	selection.active = false;
-
 	h_scroll->connect("value_changed", callable_mp(this, &TextEdit::_scroll_moved));
 	v_scroll->connect("value_changed", callable_mp(this, &TextEdit::_scroll_moved));
 
 	v_scroll->connect("scrolling", callable_mp(this, &TextEdit::_v_scroll_input));
 
-	cursor_changed_dirty = false;
-	text_changed_dirty = false;
-
-	selection.selecting_mode = SelectionMode::SELECTION_MODE_NONE;
-	selection.selecting_line = 0;
-	selection.selecting_column = 0;
-	selection.selecting_text = false;
-	selection.active = false;
-
-	block_caret = false;
-	caret_blink_enabled = false;
 	caret_blink_timer = memnew(Timer);
 	add_child(caret_blink_timer);
 	caret_blink_timer->set_wait_time(0.65);
 	caret_blink_timer->connect("timeout", callable_mp(this, &TextEdit::_toggle_draw_caret));
 	cursor_set_blink_enabled(false);
-	right_click_moves_caret = true;
 
 	idle_detect = memnew(Timer);
 	add_child(idle_detect);
@@ -7268,54 +7241,8 @@ TextEdit::TextEdit() {
 	click_select_held->set_wait_time(0.05);
 	click_select_held->connect("timeout", callable_mp(this, &TextEdit::_click_selection_held));
 
-	current_op.type = TextOperation::TYPE_NONE;
-	undo_enabled = true;
 	undo_stack_max_size = GLOBAL_GET("gui/common/text_edit_undo_stack_max_size");
-	undo_stack_pos = nullptr;
-	setting_text = false;
-	last_dblclk = 0;
-	current_op.version = 0;
-	version = 0;
-	saved_version = 0;
 
-	completion_enabled = false;
-	completion_active = false;
-	completion_line_ofs = 0;
-	tooltip_obj = nullptr;
-	line_length_guidelines = false;
-	line_length_guideline_soft_col = 80;
-	line_length_guideline_hard_col = 100;
-	hiding_enabled = false;
-	next_operation_is_complex = false;
-	scroll_past_end_of_file_enabled = false;
-	auto_brace_completion_enabled = false;
-	brace_matching_enabled = false;
-	highlight_all_occurrences = false;
-	highlight_current_line = false;
-	indent_using_spaces = false;
-	space_indent = "    ";
-	auto_indent = false;
-	insert_mode = false;
-	window_has_focus = true;
-	select_identifiers_enabled = false;
-	smooth_scroll_enabled = false;
-	scrolling = false;
-	minimap_clicked = false;
-	dragging_minimap = false;
-	can_drag_minimap = false;
-	minimap_scroll_ratio = 0;
-	minimap_scroll_click_pos = 0;
-	dragging_selection = false;
-	target_v_scroll = 0;
-	v_scroll_speed = 80;
-	draw_minimap = false;
-	minimap_width = 80;
-	minimap_char_size = Point2(1, 2);
-	minimap_line_spacing = 1;
-
-	selecting_enabled = true;
-	context_menu_enabled = true;
-	shortcut_keys_enabled = true;
 	menu = memnew(PopupMenu);
 	add_child(menu);
 
@@ -7350,12 +7277,10 @@ TextEdit::TextEdit() {
 	menu_ctl->add_item(RTR("Soft hyphen (SHY)"), MENU_INSERT_SHY);
 	menu->add_child(menu_ctl);
 
-	readonly = true; // Initialise to opposite first, so we get past the early-out in set_readonly.
 	set_readonly(false);
 	menu->connect("id_pressed", callable_mp(this, &TextEdit::menu_option));
 	menu_dir->connect("id_pressed", callable_mp(this, &TextEdit::menu_option));
 	menu_ctl->connect("id_pressed", callable_mp(this, &TextEdit::menu_option));
-	first_draw = true;
 }
 
 TextEdit::~TextEdit() {
diff --git a/scene/gui/text_edit.h b/scene/gui/text_edit.h
index dc811059c8..37299ec063 100644
--- a/scene/gui/text_edit.h
+++ b/scene/gui/text_edit.h
@@ -92,14 +92,11 @@ private:
 			Vector<Vector2i> bidi_override;
 			Ref<TextParagraph> data_buf;
 
-			bool marked;
-			bool hidden;
+			bool marked = false;
+			bool hidden = false;
 
 			Line() {
 				data_buf.instance();
-
-				marked = false;
-				hidden = false;
 			}
 		};
 
@@ -173,46 +170,31 @@ private:
 	};
 
 	struct Cursor {
-		int last_fit_x;
-		int line, column; ///< cursor
-		int x_ofs, line_ofs, wrap_ofs;
-		Cursor() {
-			last_fit_x = 0;
-			line = 0;
-			column = 0; ///< cursor
-			x_ofs = 0;
-			line_ofs = 0;
-			wrap_ofs = 0;
-		}
+		int last_fit_x = 0;
+		int line = 0;
+		int column = 0; ///< cursor
+		int x_ofs = 0;
+		int line_ofs = 0;
+		int wrap_ofs = 0;
 	} cursor;
 
 	struct Selection {
-		SelectionMode selecting_mode;
-		int selecting_line, selecting_column;
-		int selected_word_beg, selected_word_end, selected_word_origin;
-		bool selecting_text;
-
-		bool active;
-
-		int from_line, from_column;
-		int to_line, to_column;
-
-		bool shiftclick_left;
-		Selection() {
-			selecting_mode = SelectionMode::SELECTION_MODE_NONE;
-			selecting_line = 0;
-			selecting_column = 0;
-			selected_word_beg = 0;
-			selected_word_end = 0;
-			selected_word_origin = 0;
-			selecting_text = false;
-			active = false;
-			from_line = 0;
-			from_column = 0;
-			to_line = 0;
-			to_column = 0;
-			shiftclick_left = false;
-		}
+		SelectionMode selecting_mode = SelectionMode::SELECTION_MODE_NONE;
+		int selecting_line = 0;
+		int selecting_column = 0;
+		int selected_word_beg = 0;
+		int selected_word_end = 0;
+		int selected_word_origin = 0;
+		bool selecting_text = false;
+
+		bool active = false;
+
+		int from_line = 0;
+		int from_column = 0;
+		int to_line = 0;
+		int to_column = 0;
+
+		bool shiftclick_left = false;
 	} selection;
 
 	Map<int, Dictionary> syntax_highlighting_cache;
@@ -224,25 +206,16 @@ private:
 			TYPE_REMOVE
 		};
 
-		Type type;
-		int from_line, from_column;
-		int to_line, to_column;
+		Type type = TYPE_NONE;
+		int from_line = 0;
+		int from_column = 0;
+		int to_line = 0;
+		int to_column = 0;
 		String text;
-		uint32_t prev_version;
-		uint32_t version;
-		bool chain_forward;
-		bool chain_backward;
-		TextOperation() {
-			type = TYPE_NONE;
-			from_line = 0;
-			from_column = 0;
-			to_line = 0;
-			to_column = 0;
-			prev_version = 0;
-			version = 0;
-			chain_forward = false;
-			chain_backward = false;
-		}
+		uint32_t prev_version = 0;
+		uint32_t version = 0;
+		bool chain_forward = false;
+		bool chain_backward = false;
 	};
 
 	String ime_text;
@@ -251,7 +224,7 @@ private:
 	TextOperation current_op;
 
 	List<TextOperation> undo_stack;
-	List<TextOperation>::Element *undo_stack_pos;
+	List<TextOperation>::Element *undo_stack_pos = nullptr;
 	int undo_stack_max_size;
 
 	void _clear_redo();
@@ -264,20 +237,20 @@ private:
 	Dictionary _get_line_syntax_highlighting(int p_line);
 
 	Set<String> completion_prefixes;
-	bool completion_enabled;
+	bool completion_enabled = false;
 	List<ScriptCodeCompletionOption> completion_sources;
 	Vector<ScriptCodeCompletionOption> completion_options;
-	bool completion_active;
-	bool completion_forced;
+	bool completion_active = false;
+	bool completion_forced = false;
 	ScriptCodeCompletionOption completion_current;
 	String completion_base;
-	int completion_index;
+	int completion_index = 0;
 	Rect2i completion_rect;
-	int completion_line_ofs;
+	int completion_line_ofs = 0;
 	String completion_hint;
-	int completion_hint_offset;
+	int completion_hint_offset = 0;
 
-	bool setting_text;
+	bool setting_text = false;
 
 	// data
 	Text text;
@@ -290,93 +263,93 @@ private:
 	Array st_args;
 	bool draw_control_chars = false;
 
-	uint32_t version;
-	uint32_t saved_version;
+	uint32_t version = 0;
+	uint32_t saved_version = 0;
 
-	int max_chars;
-	bool readonly;
-	bool indent_using_spaces;
-	int indent_size;
-	String space_indent;
+	int max_chars = 0;
+	bool readonly = true; // Initialise to opposite first, so we get past the early-out in set_readonly.
+	bool indent_using_spaces = false;
+	int indent_size = 4;
+	String space_indent = "    ";
 
 	Timer *caret_blink_timer;
-	bool caret_blink_enabled;
-	bool draw_caret;
-	bool window_has_focus;
-	bool block_caret;
-	bool right_click_moves_caret;
+	bool caret_blink_enabled = false;
+	bool draw_caret = true;
+	bool window_has_focus = true;
+	bool block_caret = false;
+	bool right_click_moves_caret = true;
 	bool mid_grapheme_caret_enabled = false;
 
-	bool wrap_enabled;
-	int wrap_at;
-	int wrap_right_offset;
-
-	bool first_draw;
-	bool setting_row;
-	bool draw_tabs;
-	bool draw_spaces;
-	bool override_selected_font_color;
-	bool cursor_changed_dirty;
-	bool text_changed_dirty;
-	bool undo_enabled;
-	bool line_length_guidelines;
-	int line_length_guideline_soft_col;
-	int line_length_guideline_hard_col;
-	bool hiding_enabled;
-	bool draw_minimap;
-	int minimap_width;
-	Point2 minimap_char_size;
-	int minimap_line_spacing;
-
-	bool highlight_all_occurrences;
-	bool scroll_past_end_of_file_enabled;
-	bool auto_brace_completion_enabled;
-	bool brace_matching_enabled;
-	bool highlight_current_line;
-	bool auto_indent;
+	bool wrap_enabled = false;
+	int wrap_at = 0;
+	int wrap_right_offset = 10;
+
+	bool first_draw = true;
+	bool setting_row = false;
+	bool draw_tabs = false;
+	bool draw_spaces = false;
+	bool override_selected_font_color = false;
+	bool cursor_changed_dirty = false;
+	bool text_changed_dirty = false;
+	bool undo_enabled = true;
+	bool line_length_guidelines = false;
+	int line_length_guideline_soft_col = 80;
+	int line_length_guideline_hard_col = 100;
+	bool hiding_enabled = false;
+	bool draw_minimap = false;
+	int minimap_width = 80;
+	Point2 minimap_char_size = Point2(1, 2);
+	int minimap_line_spacing = 1;
+
+	bool highlight_all_occurrences = false;
+	bool scroll_past_end_of_file_enabled = false;
+	bool auto_brace_completion_enabled = false;
+	bool brace_matching_enabled = false;
+	bool highlight_current_line = false;
+	bool auto_indent = false;
 	String cut_copy_line;
-	bool insert_mode;
-	bool select_identifiers_enabled;
-
-	bool smooth_scroll_enabled;
-	bool scrolling;
-	bool dragging_selection;
-	bool dragging_minimap;
-	bool can_drag_minimap;
-	bool minimap_clicked;
-	double minimap_scroll_ratio;
-	double minimap_scroll_click_pos;
-	float target_v_scroll;
-	float v_scroll_speed;
+	bool insert_mode = false;
+	bool select_identifiers_enabled = false;
+
+	bool smooth_scroll_enabled = false;
+	bool scrolling = false;
+	bool dragging_selection = false;
+	bool dragging_minimap = false;
+	bool can_drag_minimap = false;
+	bool minimap_clicked = false;
+	double minimap_scroll_ratio = 0.0;
+	double minimap_scroll_click_pos = 0.0;
+	float target_v_scroll = 0.0;
+	float v_scroll_speed = 80.0;
 
 	String highlighted_word;
 
-	uint64_t last_dblclk;
+	uint64_t last_dblclk = 0;
 
 	Timer *idle_detect;
 	Timer *click_select_held;
 	HScrollBar *h_scroll;
 	VScrollBar *v_scroll;
-	bool updating_scrolls;
+	bool updating_scrolls = false;
 
-	Object *tooltip_obj;
+	Object *tooltip_obj = nullptr;
 	StringName tooltip_func;
 	Variant tooltip_ud;
 
-	bool next_operation_is_complex;
+	bool next_operation_is_complex = false;
 
-	bool callhint_below;
+	bool callhint_below = false;
 	Vector2 callhint_offset;
 
 	String search_text;
-	uint32_t search_flags;
-	int search_result_line;
-	int search_result_col;
+	uint32_t search_flags = 0;
+	int search_result_line = 0;
+	int search_result_col = 0;
 
-	bool selecting_enabled;
+	bool selecting_enabled = true;
 
-	bool context_menu_enabled;
-	bool shortcut_keys_enabled;
+	bool context_menu_enabled = true;
+	bool shortcut_keys_enabled = true;
 	bool virtual_keyboard_enabled = true;
 
 	void _generate_context_menu();
@@ -477,7 +450,7 @@ protected:
 		Ref<StyleBox> style_focus;
 		Ref<StyleBox> style_readonly;
 		Ref<Font> font;
-		int font_size;
+		int font_size = 16;
 		Color completion_background_color;
 		Color completion_selected_color;
 		Color completion_existing_color;
@@ -498,12 +471,8 @@ protected:
 		Color search_result_border_color;
 		Color background_color;
 
-		int line_spacing;
-		int minimap_width;
-		Cache() {
-			line_spacing = 0;
-			minimap_width = 0;
-		}
+		int line_spacing = 1;
+		int minimap_width = 0;
 	} cache;
 
 	virtual String get_tooltip(const Point2 &p_pos) const override;
diff --git a/scene/gui/texture_button.cpp b/scene/gui/texture_button.cpp
index bd670555ea..f43e3d1a9d 100644
--- a/scene/gui/texture_button.cpp
+++ b/scene/gui/texture_button.cpp
@@ -377,13 +377,4 @@ bool TextureButton::is_flipped_v() const {
 	return vflip;
 }
 
-TextureButton::TextureButton() {
-	expand = false;
-	stretch_mode = STRETCH_SCALE;
-	hflip = false;
-	vflip = false;
-
-	_texture_region = Rect2();
-	_position_rect = Rect2();
-	_tile = false;
-}
+TextureButton::TextureButton() {}
diff --git a/scene/gui/texture_button.h b/scene/gui/texture_button.h
index 4b750c3fb1..8361f3c341 100644
--- a/scene/gui/texture_button.h
+++ b/scene/gui/texture_button.h
@@ -54,15 +54,15 @@ private:
 	Ref<Texture2D> disabled;
 	Ref<Texture2D> focused;
 	Ref<BitMap> click_mask;
-	bool expand;
-	StretchMode stretch_mode;
+	bool expand = false;
+	StretchMode stretch_mode = STRETCH_SCALE;
 
 	Rect2 _texture_region;
 	Rect2 _position_rect;
-	bool _tile;
+	bool _tile = false;
 
-	bool hflip;
-	bool vflip;
+	bool hflip = false;
+	bool vflip = false;
 
 protected:
 	virtual Size2 get_minimum_size() const override;
diff --git a/scene/gui/texture_progress_bar.cpp b/scene/gui/texture_progress_bar.cpp
index 76564e2b17..46ce9d5ca9 100644
--- a/scene/gui/texture_progress_bar.cpp
+++ b/scene/gui/texture_progress_bar.cpp
@@ -145,9 +145,9 @@ Point2 TextureProgressBar::unit_val_to_uv(float val) {
 	float angle = (val * Math_TAU) - Math_PI * 0.5;
 	Point2 dir = Vector2(Math::cos(angle), Math::sin(angle));
 	float t1 = 1.0;
-	float cp = 0;
-	float cq = 0;
-	float cr = 0;
+	float cp = 0.0;
+	float cq = 0.0;
+	float cr = 0.0;
 	float edgeLeft = 0.0;
 	float edgeRight = 1.0;
 	float edgeBottom = 0.0;
@@ -540,17 +540,5 @@ void TextureProgressBar::_bind_methods() {
 }
 
 TextureProgressBar::TextureProgressBar() {
-	mode = FILL_LEFT_TO_RIGHT;
-	rad_init_angle = 0;
-	rad_center_off = Point2();
-	rad_max_degrees = 360;
 	set_mouse_filter(MOUSE_FILTER_PASS);
-
-	nine_patch_stretch = false;
-	stretch_margin[SIDE_LEFT] = 0;
-	stretch_margin[SIDE_RIGHT] = 0;
-	stretch_margin[SIDE_BOTTOM] = 0;
-	stretch_margin[SIDE_TOP] = 0;
-
-	tint_under = tint_progress = tint_over = Color(1, 1, 1);
 }
diff --git a/scene/gui/texture_progress_bar.h b/scene/gui/texture_progress_bar.h
index ee33a915f7..a3883a7017 100644
--- a/scene/gui/texture_progress_bar.h
+++ b/scene/gui/texture_progress_bar.h
@@ -98,13 +98,15 @@ public:
 	TextureProgressBar();
 
 private:
-	FillMode mode;
-	float rad_init_angle;
-	float rad_max_degrees;
+	FillMode mode = FILL_LEFT_TO_RIGHT;
+	float rad_init_angle = 0.0;
+	float rad_max_degrees = 360.0;
 	Point2 rad_center_off;
-	bool nine_patch_stretch;
-	int stretch_margin[4];
-	Color tint_under, tint_progress, tint_over;
+	bool nine_patch_stretch = false;
+	int stretch_margin[4] = {};
+	Color tint_under = Color(1, 1, 1);
+	Color tint_progress = Color(1, 1, 1);
+	Color tint_over = Color(1, 1, 1);
 
 	Point2 unit_val_to_uv(float val);
 	Point2 get_relative_center();
diff --git a/scene/gui/texture_rect.cpp b/scene/gui/texture_rect.cpp
index beb06b7739..1cba88e06f 100644
--- a/scene/gui/texture_rect.cpp
+++ b/scene/gui/texture_rect.cpp
@@ -217,11 +217,7 @@ bool TextureRect::is_flipped_v() const {
 }
 
 TextureRect::TextureRect() {
-	expand = false;
-	hflip = false;
-	vflip = false;
 	set_mouse_filter(MOUSE_FILTER_PASS);
-	stretch_mode = STRETCH_SCALE_ON_EXPAND;
 }
 
 TextureRect::~TextureRect() {
diff --git a/scene/gui/texture_rect.h b/scene/gui/texture_rect.h
index 0f3172f5bd..0f93d5732f 100644
--- a/scene/gui/texture_rect.h
+++ b/scene/gui/texture_rect.h
@@ -49,11 +49,11 @@ public:
 	};
 
 private:
-	bool expand;
-	bool hflip;
-	bool vflip;
+	bool expand = false;
+	bool hflip = false;
+	bool vflip = false;
 	Ref<Texture2D> texture;
-	StretchMode stretch_mode;
+	StretchMode stretch_mode = STRETCH_SCALE_ON_EXPAND;
 
 	void _texture_changed();
 
diff --git a/scene/gui/tree.cpp b/scene/gui/tree.cpp
index c21497a995..e8e3aeea68 100644
--- a/scene/gui/tree.cpp
+++ b/scene/gui/tree.cpp
@@ -4232,19 +4232,8 @@ void Tree::_bind_methods() {
 }
 
 Tree::Tree() {
-	selected_col = 0;
 	columns.resize(1);
-	selected_item = nullptr;
-	edited_item = nullptr;
-	selected_col = -1;
-	edited_col = -1;
 
-	hide_root = false;
-	select_mode = SELECT_SINGLE;
-	root = nullptr;
-	popup_menu = nullptr;
-	popup_edited_item = nullptr;
-	text_editor = nullptr;
 	set_focus_mode(FOCUS_ALL);
 
 	popup_menu = memnew(PopupMenu);
@@ -4288,50 +4277,9 @@ Tree::Tree() {
 
 	set_notify_transform(true);
 
-	updating_value_editor = false;
-	pressed_button = -1;
-	show_column_titles = false;
-
-	cache.click_type = Cache::CLICK_NONE;
-	cache.hover_type = Cache::CLICK_NONE;
-	cache.hover_index = -1;
-	cache.click_index = -1;
-	cache.click_id = -1;
-	cache.click_item = nullptr;
-	cache.click_column = 0;
-	cache.hover_cell = -1;
-	last_keypress = 0;
-	focus_in_id = 0;
-
-	blocked = 0;
-
-	cursor_can_exit_tree = true;
 	set_mouse_filter(MOUSE_FILTER_STOP);
 
-	drag_speed = 0;
-	drag_touching = false;
-	drag_touching_deaccel = false;
-	pressing_for_editor = false;
-	range_drag_enabled = false;
-
-	hide_folding = false;
-
-	drop_mode_flags = 0;
-	drop_mode_over = nullptr;
-	drop_mode_section = 0;
-	single_select_defer = nullptr;
-
-	scrolling = false;
-	allow_rmb_select = false;
-	force_edit_checkbox_only_on_checkbox = false;
-
 	set_clip_contents(true);
-
-	cache.hover_item = nullptr;
-	cache.hover_cell = -1;
-
-	allow_reselect = false;
-	propagate_mouse_activated = false;
 }
 
 Tree::~Tree() {
diff --git a/scene/gui/tree.h b/scene/gui/tree.h
index 854b82ebd7..c3c8052b67 100644
--- a/scene/gui/tree.h
+++ b/scene/gui/tree.h
@@ -62,7 +62,7 @@ private:
 	friend class Tree;
 
 	struct Cell {
-		TreeCellMode mode;
+		TreeCellMode mode = TreeItem::CELL_MODE_STRING;
 
 		Ref<Texture2D> icon;
 		Rect2i icon_region;
@@ -74,24 +74,27 @@ private:
 		Control::StructuredTextParser st_parser = Control::STRUCTURED_TEXT_DEFAULT;
 		Array st_args;
 		Control::TextDirection text_direction = Control::TEXT_DIRECTION_INHERITED;
-		bool dirty;
-		double min, max, step, val;
-		int icon_max_w;
-		bool expr;
-		bool checked;
-		bool editable;
-		bool selected;
-		bool selectable;
-		bool custom_color;
+		bool dirty = true;
+		double min = 0.0;
+		double max = 100.0;
+		double step = 1.0;
+		double val = 0.0;
+		int icon_max_w = 0;
+		bool expr = false;
+		bool checked = false;
+		bool editable = false;
+		bool selected = false;
+		bool selectable = true;
+		bool custom_color = false;
 		Color color;
-		bool custom_bg_color;
-		bool custom_bg_outline;
+		bool custom_bg_color = false;
+		bool custom_bg_outline = false;
 		Color bg_color;
-		bool custom_button;
-		bool expand_right;
-		Color icon_color;
+		bool custom_button = false;
+		bool expand_right = false;
+		Color icon_color = Color(1, 1, 1);
 
-		TextAlign text_align;
+		TextAlign text_align = ALIGN_LEFT;
 
 		Variant meta;
 		String tooltip;
@@ -100,42 +103,17 @@ private:
 		StringName custom_draw_callback;
 
 		struct Button {
-			int id;
-			bool disabled;
+			int id = 0;
+			bool disabled = false;
 			Ref<Texture2D> texture;
-			Color color;
+			Color color = Color(1, 1, 1, 1);
 			String tooltip;
-			Button() {
-				id = 0;
-				disabled = false;
-				color = Color(1, 1, 1, 1);
-				tooltip = "";
-			}
 		};
 
 		Vector<Button> buttons;
 
 		Cell() {
 			text_buf.instance();
-			dirty = true;
-			custom_draw_obj = ObjectID();
-			custom_button = false;
-			mode = TreeItem::CELL_MODE_STRING;
-			min = 0;
-			max = 100;
-			step = 1;
-			val = 0;
-			checked = false;
-			editable = false;
-			selected = false;
-			selectable = true;
-			custom_color = false;
-			custom_bg_color = false;
-			expr = false;
-			icon_max_w = 0;
-			text_align = ALIGN_LEFT;
-			expand_right = false;
-			icon_color = Color(1, 1, 1);
 		}
 
 		Size2 get_icon_size() const;
@@ -332,46 +310,46 @@ public:
 private:
 	friend class TreeItem;
 
-	TreeItem *root;
-	TreeItem *popup_edited_item;
-	TreeItem *selected_item;
-	TreeItem *edited_item;
+	TreeItem *root = nullptr;
+	TreeItem *popup_edited_item = nullptr;
+	TreeItem *selected_item = nullptr;
+	TreeItem *edited_item = nullptr;
 
-	TreeItem *drop_mode_over;
-	int drop_mode_section;
+	TreeItem *drop_mode_over = nullptr;
+	int drop_mode_section = 0;
 
-	TreeItem *single_select_defer;
-	int single_select_defer_column;
+	TreeItem *single_select_defer = nullptr;
+	int single_select_defer_column = 0;
 
-	int pressed_button;
-	bool pressing_for_editor;
+	int pressed_button = -1;
+	bool pressing_for_editor = false;
 	String pressing_for_editor_text;
 	Vector2 pressing_pos;
 	Rect2 pressing_item_rect;
 
-	float range_drag_base;
-	bool range_drag_enabled;
+	float range_drag_base = 0.0;
+	bool range_drag_enabled = false;
 	Vector2 range_drag_capture_pos;
 
-	bool propagate_mouse_activated;
+	bool propagate_mouse_activated = false;
 
 	//TreeItem *cursor_item;
 	//int cursor_column;
 
 	Rect2 custom_popup_rect;
-	int edited_col;
-	int selected_col;
-	int popup_edited_item_col;
-	bool hide_root;
-	SelectMode select_mode;
+	int edited_col = -1;
+	int selected_col = -1;
+	int popup_edited_item_col = -1;
+	bool hide_root = false;
+	SelectMode select_mode = SELECT_SINGLE;
 
-	int blocked;
+	int blocked = 0;
 
-	int drop_mode_flags;
+	int drop_mode_flags = 0;
 
 	struct ColumnInfo {
-		int min_width;
-		bool expand;
+		int min_width = 1;
+		bool expand = true;
 		String title;
 		Ref<TextLine> text_buf;
 		Dictionary opentype_features;
@@ -379,27 +357,25 @@ private:
 		Control::TextDirection text_direction = Control::TEXT_DIRECTION_INHERITED;
 		ColumnInfo() {
 			text_buf.instance();
-			min_width = 1;
-			expand = true;
 		}
 	};
 
-	bool show_column_titles;
+	bool show_column_titles = false;
 
 	VBoxContainer *popup_editor_vb;
 
 	Popup *popup_editor;
-	LineEdit *text_editor;
+	LineEdit *text_editor = nullptr;
 	HSlider *value_editor;
-	bool updating_value_editor;
-	uint64_t focus_in_id;
-	PopupMenu *popup_menu;
+	bool updating_value_editor = false;
+	uint64_t focus_in_id = 0;
+	PopupMenu *popup_menu = nullptr;
 
 	Vector<ColumnInfo> columns;
 
 	Timer *range_click_timer;
-	TreeItem *range_item_last;
-	bool range_up_last;
+	TreeItem *range_item_last = nullptr;
+	bool range_up_last = false;
 	void _range_click_timeout();
 
 	int compute_item_height(TreeItem *p_item) const;
@@ -434,8 +410,8 @@ private:
 	struct Cache {
 		Ref<Font> font;
 		Ref<Font> tb_font;
-		int font_size;
-		int tb_font_size;
+		int font_size = 0;
+		int tb_font_size = 0;
 		Ref<StyleBox> bg;
 		Ref<StyleBox> selected;
 		Ref<StyleBox> selected_focus;
@@ -465,15 +441,15 @@ private:
 		Color relationship_line_color;
 		Color custom_button_font_highlight;
 
-		int hseparation;
-		int vseparation;
-		int item_margin;
-		int button_margin;
+		int hseparation = 0;
+		int vseparation = 0;
+		int item_margin = 0;
+		int button_margin = 0;
 		Point2 offset;
-		int draw_relationship_lines;
-		int draw_guides;
-		int scroll_border;
-		int scroll_speed;
+		int draw_relationship_lines = 0;
+		int draw_guides = 0;
+		int scroll_border = 0;
+		int scroll_speed = 0;
 
 		enum ClickType {
 			CLICK_NONE,
@@ -482,17 +458,17 @@ private:
 
 		};
 
-		ClickType click_type;
-		ClickType hover_type;
-		int click_index;
-		int click_id;
-		TreeItem *click_item;
-		int click_column;
-		int hover_index;
+		ClickType click_type = Cache::CLICK_NONE;
+		ClickType hover_type = Cache::CLICK_NONE;
+		int click_index = -1;
+		int click_id = -1;
+		TreeItem *click_item = nullptr;
+		int click_column = 0;
+		int hover_index = -1;
 		Point2 click_pos;
 
-		TreeItem *hover_item;
-		int hover_cell;
+		TreeItem *hover_item = nullptr;
+		int hover_cell = -1;
 
 		Point2i text_editor_position;
 
@@ -510,9 +486,9 @@ private:
 
 	Rect2 search_item_rect(TreeItem *p_from, TreeItem *p_item);
 	//Rect2 get_item_rect(TreeItem *p_item);
-	uint64_t last_keypress;
+	uint64_t last_keypress = 0;
 	String incr_search;
-	bool cursor_can_exit_tree;
+	bool cursor_can_exit_tree = true;
 	void _do_incr_search(const String &p_add);
 
 	TreeItem *_search_item_text(TreeItem *p_at, const String &p_find, int *r_col, bool p_selectable, bool p_backwards = false);
@@ -526,21 +502,21 @@ private:
 	float last_drag_time;
 	float time_since_motion;*/
 
-	float drag_speed;
-	float drag_from;
-	float drag_accum;
+	float drag_speed = 0.0;
+	float drag_from = 0.0;
+	float drag_accum = 0.0;
 	Vector2 last_speed;
-	bool drag_touching;
-	bool drag_touching_deaccel;
-	bool click_handled;
-	bool allow_rmb_select;
-	bool scrolling;
+	bool drag_touching = false;
+	bool drag_touching_deaccel = false;
+	bool click_handled = false;
+	bool allow_rmb_select = false;
+	bool scrolling = false;
 
-	bool allow_reselect;
+	bool allow_reselect = false;
 
-	bool force_edit_checkbox_only_on_checkbox;
+	bool force_edit_checkbox_only_on_checkbox = false;
 
-	bool hide_folding;
+	bool hide_folding = false;
 
 	int _count_selected_items(TreeItem *p_from) const;
 	void _go_left();
diff --git a/scene/gui/video_player.cpp b/scene/gui/video_player.cpp
index 84d689369b..0590ae2415 100644
--- a/scene/gui/video_player.cpp
+++ b/scene/gui/video_player.cpp
@@ -462,25 +462,7 @@ void VideoPlayer::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::STRING_NAME, "bus", PROPERTY_HINT_ENUM, ""), "set_bus", "get_bus");
 }
 
-VideoPlayer::VideoPlayer() {
-	volume = 1;
-	loops = false;
-	paused = false;
-	autoplay = false;
-	expand = true;
-
-	audio_track = 0;
-	bus_index = 0;
-
-	buffering_ms = 500;
-
-	//	internal_stream.player=this;
-	//	stream_rid=AudioServer::get_singleton()->audio_stream_create(&internal_stream);
-	last_audio_time = 0;
-
-	wait_resampler = 0;
-	wait_resampler_limit = 2;
-};
+VideoPlayer::VideoPlayer() {}
 
 VideoPlayer::~VideoPlayer() {
 	//	if (stream_rid.is_valid())
diff --git a/scene/gui/video_player.h b/scene/gui/video_player.h
index 089337eed5..0edad296a1 100644
--- a/scene/gui/video_player.h
+++ b/scene/gui/video_player.h
@@ -41,8 +41,8 @@ class VideoPlayer : public Control {
 
 	struct Output {
 		AudioFrame vol;
-		int bus_index;
-		Viewport *viewport; //pointer only used for reference to previous mix
+		int bus_index = 0;
+		Viewport *viewport = nullptr; //pointer only used for reference to previous mix
 	};
 	Ref<VideoStreamPlayback> playback;
 	Ref<VideoStream> stream;
@@ -56,17 +56,18 @@ class VideoPlayer : public Control {
 
 	AudioRBResampler resampler;
 	Vector<AudioFrame> mix_buffer;
-	int wait_resampler, wait_resampler_limit;
-
-	bool paused;
-	bool autoplay;
-	float volume;
-	double last_audio_time;
-	bool expand;
-	bool loops;
-	int buffering_ms;
-	int audio_track;
-	int bus_index;
+	int wait_resampler = 0;
+	int wait_resampler_limit = 2;
+
+	bool paused = false;
+	bool autoplay = false;
+	float volume = 1.0;
+	double last_audio_time = 0.0;
+	bool expand = true;
+	bool loops = false;
+	int buffering_ms = 500;
+	int audio_track = 0;
+	int bus_index = 0;
 
 	StringName bus;
 
diff --git a/scene/main/canvas_item.h b/scene/main/canvas_item.h
index 64eb3f4e0a..e22f93a7ea 100644
--- a/scene/main/canvas_item.h
+++ b/scene/main/canvas_item.h
@@ -90,7 +90,7 @@ private:
 
 	struct ShaderData {
 		RID shader;
-		int users;
+		int users = 0;
 	};
 
 	static Map<MaterialKey, ShaderData> shader_map;
diff --git a/scene/main/canvas_layer.cpp b/scene/main/canvas_layer.cpp
index 9826d9d4db..91daa08ff8 100644
--- a/scene/main/canvas_layer.cpp
+++ b/scene/main/canvas_layer.cpp
@@ -303,17 +303,7 @@ void CanvasLayer::_bind_methods() {
 }
 
 CanvasLayer::CanvasLayer() {
-	vp = nullptr;
-	scale = Vector2(1, 1);
-	rot = 0;
-	locrotscale_dirty = false;
-	layer = 1;
 	canvas = RS::get_singleton()->canvas_create();
-	custom_viewport = nullptr;
-
-	sort_index = 0;
-	follow_viewport = false;
-	follow_viewport_scale = 1.0;
 }
 
 CanvasLayer::~CanvasLayer() {
diff --git a/scene/main/canvas_layer.h b/scene/main/canvas_layer.h
index cb10c6299b..181d1dd659 100644
--- a/scene/main/canvas_layer.h
+++ b/scene/main/canvas_layer.h
@@ -38,24 +38,24 @@ class Viewport;
 class CanvasLayer : public Node {
 	GDCLASS(CanvasLayer, Node);
 
-	bool locrotscale_dirty;
+	bool locrotscale_dirty = false;
 	Vector2 ofs;
-	Size2 scale;
-	real_t rot;
-	int layer;
+	Size2 scale = Vector2(1, 1);
+	real_t rot = 0.0;
+	int layer = 1;
 	Transform2D transform;
 	RID canvas;
 
 	ObjectID custom_viewport_id; // to check validity
-	Viewport *custom_viewport;
+	Viewport *custom_viewport = nullptr;
 
 	RID viewport;
-	Viewport *vp;
+	Viewport *vp = nullptr;
 
-	int sort_index;
+	int sort_index = 0;
 
-	bool follow_viewport;
-	float follow_viewport_scale;
+	bool follow_viewport = false;
+	float follow_viewport_scale = 1.0;
 
 	void _update_xform();
 	void _update_locrotscale();
diff --git a/scene/main/http_request.cpp b/scene/main/http_request.cpp
index 4c6b85d78b..384e7d2652 100644
--- a/scene/main/http_request.cpp
+++ b/scene/main/http_request.cpp
@@ -638,29 +638,11 @@ void HTTPRequest::_bind_methods() {
 }
 
 HTTPRequest::HTTPRequest() {
-	port = 80;
-	redirections = 0;
-	max_redirects = 8;
-	body_len = -1;
-	got_response = false;
-	validate_ssl = false;
-	use_ssl = false;
-	accept_gzip = true;
-	response_code = 0;
-	request_sent = false;
-	requesting = false;
 	client.instance();
-	use_threads = false;
-	thread_done = false;
-	downloaded = 0;
-	body_size_limit = -1;
-	file = nullptr;
-
 	timer = memnew(Timer);
 	timer->set_one_shot(true);
 	timer->connect("timeout", callable_mp(this, &HTTPRequest::_timeout));
 	add_child(timer);
-	timeout = 0;
 }
 
 HTTPRequest::~HTTPRequest() {
diff --git a/scene/main/http_request.h b/scene/main/http_request.h
index 9dbf561cd4..5525ea7912 100644
--- a/scene/main/http_request.h
+++ b/scene/main/http_request.h
@@ -60,42 +60,42 @@ public:
 	};
 
 private:
-	bool requesting;
+	bool requesting = false;
 
 	String request_string;
 	String url;
-	int port;
+	int port = 80;
 	Vector<String> headers;
-	bool validate_ssl;
-	bool use_ssl;
+	bool validate_ssl = false;
+	bool use_ssl = false;
 	HTTPClient::Method method;
 	Vector<uint8_t> request_data;
 
-	bool request_sent;
+	bool request_sent = false;
 	Ref<HTTPClient> client;
 	PackedByteArray body;
-	volatile bool use_threads;
-	bool accept_gzip;
+	volatile bool use_threads = false;
+	bool accept_gzip = true;
 
-	bool got_response;
-	int response_code;
+	bool got_response = false;
+	int response_code = 0;
 	Vector<String> response_headers;
 
 	String download_to_file;
 
-	FileAccess *file;
+	FileAccess *file = nullptr;
 
-	int body_len;
-	volatile int downloaded;
-	int body_size_limit;
+	int body_len = -1;
+	volatile int downloaded = 0;
+	int body_size_limit = -1;
 
-	int redirections;
+	int redirections = 0;
 
 	bool _update_connection();
 
-	int max_redirects;
+	int max_redirects = 8;
 
-	int timeout;
+	int timeout = 0;
 
 	void _redirect_request(const String &p_new_url);
 
@@ -107,8 +107,8 @@ private:
 	bool has_header(const PackedStringArray &p_headers, const String &p_header_name);
 	String get_header_value(const PackedStringArray &p_headers, const String &header_name);
 
-	volatile bool thread_done;
-	volatile bool thread_request_quit;
+	volatile bool thread_done = false;
+	volatile bool thread_request_quit = false;
 
 	Thread thread;
 
diff --git a/scene/main/node.h b/scene/main/node.h
index a0dca75791..5253ed2e45 100644
--- a/scene/main/node.h
+++ b/scene/main/node.h
@@ -80,7 +80,7 @@ private:
 
 	struct NetData {
 		StringName name;
-		MultiplayerAPI::RPCMode mode;
+		MultiplayerAPI::RPCMode mode = MultiplayerAPI::RPCMode::RPC_MODE_DISABLED;
 	};
 
 	struct Data {
@@ -297,7 +297,7 @@ public:
 
 	struct GroupInfo {
 		StringName name;
-		bool persistent;
+		bool persistent = false;
 	};
 
 	void get_groups(List<GroupInfo> *p_groups) const;
diff --git a/scene/main/scene_tree.cpp b/scene/main/scene_tree.cpp
index 4f1143b201..0161786681 100644
--- a/scene/main/scene_tree.cpp
+++ b/scene/main/scene_tree.cpp
@@ -90,10 +90,7 @@ void SceneTreeTimer::release_connections() {
 	}
 }
 
-SceneTreeTimer::SceneTreeTimer() {
-	time_left = 0;
-	process_pause = true;
-}
+SceneTreeTimer::SceneTreeTimer() {}
 
 void SceneTree::tree_changed() {
 	tree_version++;
diff --git a/scene/main/scene_tree.h b/scene/main/scene_tree.h
index 748908c8a6..35622c2031 100644
--- a/scene/main/scene_tree.h
+++ b/scene/main/scene_tree.h
@@ -51,8 +51,8 @@ class SceneDebugger;
 class SceneTreeTimer : public Reference {
 	GDCLASS(SceneTreeTimer, Reference);
 
-	float time_left;
-	bool process_pause;
+	float time_left = 0.0;
+	bool process_pause = true;
 
 protected:
 	static void _bind_methods();
@@ -80,8 +80,7 @@ public:
 private:
 	struct Group {
 		Vector<Node *> nodes;
-		bool changed;
-		Group() { changed = false; };
+		bool changed = false;
 	};
 
 	Window *root = nullptr;
diff --git a/scene/main/shader_globals_override.cpp b/scene/main/shader_globals_override.cpp
index 4485cffff5..b6b2982155 100644
--- a/scene/main/shader_globals_override.cpp
+++ b/scene/main/shader_globals_override.cpp
@@ -277,6 +277,4 @@ void ShaderGlobalsOverride::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("_activate"), &ShaderGlobalsOverride::_activate);
 }
 
-ShaderGlobalsOverride::ShaderGlobalsOverride() {
-	active = false;
-}
+ShaderGlobalsOverride::ShaderGlobalsOverride() {}
diff --git a/scene/main/shader_globals_override.h b/scene/main/shader_globals_override.h
index 9e666a0ec5..8d8794d465 100644
--- a/scene/main/shader_globals_override.h
+++ b/scene/main/shader_globals_override.h
@@ -43,7 +43,7 @@ class ShaderGlobalsOverride : public Node {
 
 	StringName *_remap(const StringName &p_name) const;
 
-	bool active;
+	bool active = false;
 	mutable HashMap<StringName, Override> overrides;
 	mutable HashMap<StringName, StringName> param_remaps;
 
diff --git a/scene/main/timer.cpp b/scene/main/timer.cpp
index d7b2292ff5..3661b6c394 100644
--- a/scene/main/timer.cpp
+++ b/scene/main/timer.cpp
@@ -217,12 +217,4 @@ void Timer::_bind_methods() {
 	BIND_ENUM_CONSTANT(TIMER_PROCESS_IDLE);
 }
 
-Timer::Timer() {
-	timer_process_mode = TIMER_PROCESS_IDLE;
-	autostart = false;
-	wait_time = 1;
-	one_shot = false;
-	time_left = -1;
-	processing = false;
-	paused = false;
-}
+Timer::Timer() {}
diff --git a/scene/main/timer.h b/scene/main/timer.h
index 0604a2d990..672290cf50 100644
--- a/scene/main/timer.h
+++ b/scene/main/timer.h
@@ -36,13 +36,13 @@
 class Timer : public Node {
 	GDCLASS(Timer, Node);
 
-	float wait_time;
-	bool one_shot;
-	bool autostart;
-	bool processing;
-	bool paused;
+	float wait_time = 1.0;
+	bool one_shot = false;
+	bool autostart = false;
+	bool processing = false;
+	bool paused = false;
 
-	double time_left;
+	double time_left = -1.0;
 
 protected:
 	void _notification(int p_what);
@@ -78,7 +78,7 @@ public:
 	Timer();
 
 private:
-	TimerProcessMode timer_process_mode;
+	TimerProcessMode timer_process_mode = TIMER_PROCESS_IDLE;
 	void _set_process(bool p_process, bool p_force = false);
 };
 
diff --git a/scene/main/viewport.cpp b/scene/main/viewport.cpp
index 1d0a6074c1..a0750b2590 100644
--- a/scene/main/viewport.cpp
+++ b/scene/main/viewport.cpp
@@ -144,7 +144,6 @@ void ViewportTexture::_bind_methods() {
 }
 
 ViewportTexture::ViewportTexture() {
-	vp = nullptr;
 	set_local_to_scene(true);
 }
 
@@ -184,26 +183,6 @@ public:
 
 /////////////////////////////////////
 
-Viewport::GUI::GUI() {
-	embed_subwindows_hint = false;
-	embedding_subwindows = false;
-
-	dragging = false;
-	mouse_focus = nullptr;
-	forced_mouse_focus = false;
-	mouse_click_grabber = nullptr;
-	mouse_focus_mask = 0;
-	key_focus = nullptr;
-	mouse_over = nullptr;
-	drag_mouse_over = nullptr;
-
-	tooltip_control = nullptr;
-	tooltip_popup = nullptr;
-	tooltip_label = nullptr;
-}
-
-/////////////////////////////////////
-
 void Viewport::update_worlds() {
 	if (!is_inside_tree()) {
 		return;
@@ -3688,26 +3667,10 @@ Viewport::Viewport() {
 	viewport_textures.insert(default_texture.ptr());
 	default_texture->proxy = RS::get_singleton()->texture_proxy_create(texture_rid);
 
-	audio_listener = false;
 	//internal_listener_2d = SpatialSound2DServer::get_singleton()->listener_create();
-	audio_listener_2d = false;
-	transparent_bg = false;
-	parent = nullptr;
-	listener = nullptr;
-	camera = nullptr;
-	override_canvas_transform = false;
 	canvas_layers.insert(nullptr); // This eases picking code (interpreted as the canvas of the Viewport)
 
-	gen_mipmaps = false;
-
 	//clear=true;
-
-	physics_object_picking = false;
-	physics_has_last_mousepos = false;
-	physics_last_mousepos = Vector2(Math_INF, Math_INF);
-
-	shadow_atlas_16_bits = true;
-	shadow_atlas_size = 2048;
 	set_shadow_atlas_size(shadow_atlas_size);
 
 	for (int i = 0; i < 4; i++) {
@@ -3726,50 +3689,11 @@ Viewport::Viewport() {
 	unhandled_input_group = "_vp_unhandled_input" + id;
 	unhandled_key_input_group = "_vp_unhandled_key_input" + id;
 
-	disable_input = false;
-
 	// Window tooltip.
-	gui.tooltip_timer = -1;
-
 	gui.tooltip_delay = GLOBAL_DEF("gui/timers/tooltip_delay_sec", 0.5);
 	ProjectSettings::get_singleton()->set_custom_property_info("gui/timers/tooltip_delay_sec", PropertyInfo(Variant::FLOAT, "gui/timers/tooltip_delay_sec", PROPERTY_HINT_RANGE, "0,5,0.01,or_greater")); // No negative numbers
 
-	gui.tooltip_control = nullptr;
-	gui.tooltip_label = nullptr;
-	gui.drag_preview = nullptr;
-	gui.drag_attempted = false;
-	gui.canvas_sort_index = 0;
-	gui.roots_order_dirty = false;
-	gui.mouse_focus = nullptr;
-	gui.forced_mouse_focus = false;
-	gui.last_mouse_focus = nullptr;
-	gui.subwindow_focused = nullptr;
-	gui.subwindow_drag = SUB_WINDOW_DRAG_DISABLED;
-
-	msaa = MSAA_DISABLED;
-	screen_space_aa = SCREEN_SPACE_AA_DISABLED;
-	debug_draw = DEBUG_DRAW_DISABLED;
-
-	snap_controls_to_pixels = true;
-	snap_2d_transforms_to_pixel = false;
-	snap_2d_vertices_to_pixel = false;
-
-	physics_last_mouse_state.alt = false;
-	physics_last_mouse_state.control = false;
-	physics_last_mouse_state.shift = false;
-	physics_last_mouse_state.meta = false;
-	physics_last_mouse_state.mouse_mask = 0;
-	local_input_handled = false;
-	handle_input_locally = true;
-
-	size_allocated = false;
-
-	default_canvas_item_texture_filter = DEFAULT_CANVAS_ITEM_TEXTURE_FILTER_LINEAR;
-	default_canvas_item_texture_repeat = DEFAULT_CANVAS_ITEM_TEXTURE_REPEAT_DISABLED;
-
-	sdf_oversize = SDF_OVERSIZE_120_PERCENT;
-	sdf_scale = SDF_SCALE_50_PERCENT;
-	set_sdf_oversize(SDF_OVERSIZE_120_PERCENT); //set to server
+	set_sdf_oversize(sdf_oversize); //set to server
 }
 
 Viewport::~Viewport() {
@@ -3901,12 +3825,6 @@ void SubViewport::_bind_methods() {
 	BIND_ENUM_CONSTANT(UPDATE_ALWAYS);
 }
 
-SubViewport::SubViewport() {
-	xr = false;
-	size_2d_override_stretch = false;
-	update_mode = UPDATE_WHEN_VISIBLE;
-	clear_mode = CLEAR_MODE_ALWAYS;
-}
+SubViewport::SubViewport() {}
 
-SubViewport::~SubViewport() {
-}
+SubViewport::~SubViewport() {}
diff --git a/scene/main/viewport.h b/scene/main/viewport.h
index bddc45206d..2a0026a561 100644
--- a/scene/main/viewport.h
+++ b/scene/main/viewport.h
@@ -56,7 +56,7 @@ class ViewportTexture : public Texture2D {
 	NodePath path;
 
 	friend class Viewport;
-	Viewport *vp;
+	Viewport *vp = nullptr;
 
 	mutable RID proxy_ph;
 	mutable RID proxy;
@@ -186,9 +186,9 @@ public:
 private:
 	friend class ViewportTexture;
 
-	Viewport *parent;
+	Viewport *parent = nullptr;
 
-	Listener3D *listener;
+	Listener3D *listener = nullptr;
 	Set<Listener3D *> listeners;
 
 	struct CameraOverrideData {
@@ -197,11 +197,11 @@ private:
 			PROJECTION_PERSPECTIVE,
 			PROJECTION_ORTHOGONAL
 		};
-		Projection projection;
-		float fov;
-		float size;
-		float z_near;
-		float z_far;
+		Projection projection = Projection::PROJECTION_PERSPECTIVE;
+		float fov = 0.0;
+		float size = 0.0;
+		float z_near = 0.0;
+		float z_far = 0.0;
 		RID rid;
 
 		operator bool() const {
@@ -209,7 +209,7 @@ private:
 		}
 	} camera_override;
 
-	Camera3D *camera;
+	Camera3D *camera = nullptr;
 	Set<Camera3D *> cameras;
 	Set<CanvasLayer *> canvas_layers;
 
@@ -217,13 +217,13 @@ private:
 	RID current_canvas;
 	RID subwindow_canvas;
 
-	bool audio_listener;
+	bool audio_listener = false;
 	RID internal_listener;
 
-	bool audio_listener_2d;
+	bool audio_listener_2d = false;
 	RID internal_listener_2d;
 
-	bool override_canvas_transform;
+	bool override_canvas_transform = false;
 
 	Transform2D canvas_transform_override;
 	Transform2D canvas_transform;
@@ -232,7 +232,7 @@ private:
 
 	Size2i size;
 	Size2i size_2d_override;
-	bool size_allocated;
+	bool size_allocated = false;
 
 	RID contact_2d_debug;
 	RID contact_3d_debug_multimesh;
@@ -240,36 +240,36 @@ private:
 
 	Rect2 last_vp_rect;
 
-	bool transparent_bg;
+	bool transparent_bg = false;
 	bool filter;
-	bool gen_mipmaps;
+	bool gen_mipmaps = false;
 
-	bool snap_controls_to_pixels;
-	bool snap_2d_transforms_to_pixel;
-	bool snap_2d_vertices_to_pixel;
+	bool snap_controls_to_pixels = true;
+	bool snap_2d_transforms_to_pixel = false;
+	bool snap_2d_vertices_to_pixel = false;
 
-	bool physics_object_picking;
+	bool physics_object_picking = false;
 	List<Ref<InputEvent>> physics_picking_events;
 	ObjectID physics_object_capture;
 	ObjectID physics_object_over;
 	Transform physics_last_object_transform;
 	Transform physics_last_camera_transform;
 	ObjectID physics_last_id;
-	bool physics_has_last_mousepos;
-	Vector2 physics_last_mousepos;
+	bool physics_has_last_mousepos = false;
+	Vector2 physics_last_mousepos = Vector2(Math_INF, Math_INF);
 	struct {
-		bool alt;
-		bool control;
-		bool shift;
-		bool meta;
-		int mouse_mask;
+		bool alt = false;
+		bool control = false;
+		bool shift = false;
+		bool meta = false;
+		int mouse_mask = 0;
 
 	} physics_last_mouse_state;
 
 	void _collision_object_input_event(CollisionObject3D *p_object, Camera3D *p_camera, const Ref<InputEvent> &p_input_event, const Vector3 &p_pos, const Vector3 &p_normal, int p_shape);
 
-	bool handle_input_locally;
-	bool local_input_handled;
+	bool handle_input_locally = true;
+	bool local_input_handled = false;
 
 	Map<ObjectID, uint64_t> physics_2d_mouseover;
 
@@ -294,22 +294,22 @@ private:
 
 	RID texture_rid;
 
-	DebugDraw debug_draw;
+	DebugDraw debug_draw = DEBUG_DRAW_DISABLED;
 
-	int shadow_atlas_size;
+	int shadow_atlas_size = 2048;
 	bool shadow_atlas_16_bits = true;
 	ShadowAtlasQuadrantSubdiv shadow_atlas_quadrant_subdiv[4];
 
-	MSAA msaa;
-	ScreenSpaceAA screen_space_aa;
+	MSAA msaa = MSAA_DISABLED;
+	ScreenSpaceAA screen_space_aa = SCREEN_SPACE_AA_DISABLED;
 	bool use_debanding = false;
 	float lod_threshold = 1.0;
 
 	Ref<ViewportTexture> default_texture;
 	Set<ViewportTexture *> viewport_textures;
 
-	SDFOversize sdf_oversize;
-	SDFScale sdf_scale;
+	SDFOversize sdf_oversize = SDF_OVERSIZE_120_PERCENT;
+	SDFScale sdf_scale = SDF_SCALE_50_PERCENT;
 
 	enum SubWindowDrag {
 		SUB_WINDOW_DRAG_DISABLED,
@@ -332,60 +332,58 @@ private:
 	};
 
 	struct SubWindow {
-		Window *window;
+		Window *window = nullptr;
 		RID canvas_item;
 	};
 
 	struct GUI {
 		// info used when this is a window
 
-		bool forced_mouse_focus; //used for menu buttons
-		bool key_event_accepted;
-		Control *mouse_focus;
-		Control *last_mouse_focus;
-		Control *mouse_click_grabber;
-		int mouse_focus_mask;
-		Control *key_focus;
-		Control *mouse_over;
-		Control *drag_mouse_over;
+		bool forced_mouse_focus = false; //used for menu buttons
+		bool key_event_accepted = false;
+		Control *mouse_focus = nullptr;
+		Control *last_mouse_focus = nullptr;
+		Control *mouse_click_grabber = nullptr;
+		int mouse_focus_mask = 0;
+		Control *key_focus = nullptr;
+		Control *mouse_over = nullptr;
+		Control *drag_mouse_over = nullptr;
 		Vector2 drag_mouse_over_pos;
-		Control *tooltip_control;
-		Window *tooltip_popup;
-		Label *tooltip_label;
+		Control *tooltip_control = nullptr;
+		Window *tooltip_popup = nullptr;
+		Label *tooltip_label = nullptr;
 		Point2 tooltip_pos;
 		Point2 last_mouse_pos;
 		Point2 drag_accum;
-		bool drag_attempted;
+		bool drag_attempted = false;
 		Variant drag_data;
-		Control *drag_preview;
-		float tooltip_timer;
-		float tooltip_delay;
+		Control *drag_preview = nullptr;
+		float tooltip_timer = -1.0;
+		float tooltip_delay = 0.0;
 		Transform2D focus_inv_xform;
-		bool roots_order_dirty;
+		bool roots_order_dirty = false;
 		List<Control *> roots;
-		int canvas_sort_index; //for sorting items with canvas as root
-		bool dragging;
-		bool embed_subwindows_hint;
-		bool embedding_subwindows;
+		int canvas_sort_index = 0; //for sorting items with canvas as root
+		bool dragging = false;
+		bool embed_subwindows_hint = false;
+		bool embedding_subwindows = false;
 
-		Window *subwindow_focused;
-		SubWindowDrag subwindow_drag;
+		Window *subwindow_focused = nullptr;
+		SubWindowDrag subwindow_drag = SUB_WINDOW_DRAG_DISABLED;
 		Vector2 subwindow_drag_from;
 		Vector2 subwindow_drag_pos;
 		Rect2i subwindow_drag_close_rect;
-		bool subwindow_drag_close_inside;
+		bool subwindow_drag_close_inside = false;
 		SubWindowResize subwindow_resize_mode;
 		Rect2i subwindow_resize_from_rect;
 
 		Vector<SubWindow> sub_windows;
-
-		GUI();
 	} gui;
 
-	DefaultCanvasItemTextureFilter default_canvas_item_texture_filter;
-	DefaultCanvasItemTextureRepeat default_canvas_item_texture_repeat;
+	DefaultCanvasItemTextureFilter default_canvas_item_texture_filter = DEFAULT_CANVAS_ITEM_TEXTURE_FILTER_LINEAR;
+	DefaultCanvasItemTextureRepeat default_canvas_item_texture_repeat = DEFAULT_CANVAS_ITEM_TEXTURE_REPEAT_DISABLED;
 
-	bool disable_input;
+	bool disable_input = false;
 
 	void _gui_call_input(Control *p_control, const Ref<InputEvent> &p_input);
 	void _gui_call_notification(Control *p_control, int p_what);
@@ -651,10 +649,10 @@ public:
 	};
 
 private:
-	UpdateMode update_mode;
-	ClearMode clear_mode;
-	bool xr;
-	bool size_2d_override_stretch;
+	UpdateMode update_mode = UPDATE_WHEN_VISIBLE;
+	ClearMode clear_mode = CLEAR_MODE_ALWAYS;
+	bool xr = false;
+	bool size_2d_override_stretch = false;
 
 protected:
 	static void _bind_methods();
diff --git a/scene/main/window.cpp b/scene/main/window.cpp
index 0a541a2d07..f39823736b 100644
--- a/scene/main/window.cpp
+++ b/scene/main/window.cpp
@@ -1466,11 +1466,6 @@ void Window::_bind_methods() {
 }
 
 Window::Window() {
-	for (int i = 0; i < FLAG_MAX; i++) {
-		flags[i] = false;
-	}
-	content_scale_mode = CONTENT_SCALE_MODE_DISABLED;
-	content_scale_aspect = CONTENT_SCALE_ASPECT_IGNORE;
 	RS::get_singleton()->viewport_set_update_mode(get_viewport_rid(), RS::VIEWPORT_UPDATE_DISABLED);
 }
 
diff --git a/scene/main/window.h b/scene/main/window.h
index 2ffeff03ff..38846ed00e 100644
--- a/scene/main/window.h
+++ b/scene/main/window.h
@@ -90,7 +90,7 @@ private:
 	mutable Size2i min_size;
 	mutable Size2i max_size;
 	mutable Mode mode = MODE_WINDOWED;
-	mutable bool flags[FLAG_MAX];
+	mutable bool flags[FLAG_MAX] = {};
 	bool visible = true;
 	bool focused = false;
 
@@ -106,8 +106,8 @@ private:
 	void _update_child_controls();
 
 	Size2i content_scale_size;
-	ContentScaleMode content_scale_mode;
-	ContentScaleAspect content_scale_aspect;
+	ContentScaleMode content_scale_mode = CONTENT_SCALE_MODE_DISABLED;
+	ContentScaleAspect content_scale_aspect = CONTENT_SCALE_ASPECT_IGNORE;
 
 	void _make_window();
 	void _clear_window();
diff --git a/scene/resources/animation.cpp b/scene/resources/animation.cpp
index 796fe1d106..62a796b492 100644
--- a/scene/resources/animation.cpp
+++ b/scene/resources/animation.cpp
@@ -1604,7 +1604,7 @@ T Animation::_interpolate(const Vector<TKey<T>> &p_keys, float p_time, Interpola
 
 	bool result = true;
 	int next = 0;
-	float c = 0;
+	float c = 0.0;
 	// prepare for all cases of interpolation
 
 	if (loop && p_loop_wrap) {
@@ -2278,8 +2278,8 @@ float Animation::bezier_track_interpolate(int p_track, float p_time) const {
 	int iterations = 10;
 
 	float duration = bt->values[idx + 1].time - bt->values[idx].time; // time duration between our two keyframes
-	float low = 0; // 0% of the current animation segment
-	float high = 1; // 100% of the current animation segment
+	float low = 0.0; // 0% of the current animation segment
+	float high = 1.0; // 100% of the current animation segment
 	float middle;
 
 	Vector2 start(0, bt->values[idx].value.value);
@@ -2836,7 +2836,7 @@ bool Animation::_transform_track_optimize_key(const TKey<TransformKey> &t0, cons
 		erase = true;
 	} else {
 		erase = true;
-		real_t lt = -1;
+		real_t lt = -1.0;
 		for (int j = 0; j < 3; j++) {
 			//search for t on first, one must be it
 			if (t[j] != -1) {
@@ -2919,11 +2919,7 @@ void Animation::optimize(float p_allowed_linear_err, float p_allowed_angular_err
 	}
 }
 
-Animation::Animation() {
-	step = 0.1;
-	loop = false;
-	length = 1;
-}
+Animation::Animation() {}
 
 Animation::~Animation() {
 	for (int i = 0; i < tracks.size(); i++) {
diff --git a/scene/resources/animation.h b/scene/resources/animation.h
index fa374e6ad2..ab3bbfacba 100644
--- a/scene/resources/animation.h
+++ b/scene/resources/animation.h
@@ -65,28 +65,19 @@ public:
 
 private:
 	struct Track {
-		TrackType type;
-		InterpolationType interpolation;
-		bool loop_wrap;
+		TrackType type = TrackType::TYPE_ANIMATION;
+		InterpolationType interpolation = INTERPOLATION_LINEAR;
+		bool loop_wrap = true;
 		NodePath path; // path to something
-		bool imported;
-		bool enabled;
-		Track() {
-			interpolation = INTERPOLATION_LINEAR;
-			imported = false;
-			loop_wrap = true;
-			enabled = true;
-		}
+		bool imported = false;
+		bool enabled = false;
+		Track() {}
 		virtual ~Track() {}
 	};
 
 	struct Key {
-		float transition;
-		float time; // time in secs
-		Key() {
-			transition = 1;
-			time = 0;
-		}
+		float transition = 1.0;
+		float time = 0.0; // time in secs
 	};
 
 	// transform key holds either Vector3 or Quaternion
@@ -112,13 +103,12 @@ private:
 	/* PROPERTY VALUE TRACK */
 
 	struct ValueTrack : public Track {
-		UpdateMode update_mode;
-		bool update_on_seek;
+		UpdateMode update_mode = UPDATE_CONTINUOUS;
+		bool update_on_seek = false;
 		Vector<TKey<Variant>> values;
 
 		ValueTrack() {
 			type = TYPE_VALUE;
-			update_mode = UPDATE_CONTINUOUS;
 		}
 	};
 
@@ -139,7 +129,7 @@ private:
 	struct BezierKey {
 		Vector2 in_handle; //relative (x always <0)
 		Vector2 out_handle; //relative (x always >0)
-		float value;
+		float value = 0.0;
 	};
 
 	struct BezierTrack : public Track {
@@ -154,11 +144,9 @@ private:
 
 	struct AudioKey {
 		RES stream;
-		float start_offset; //offset from start
-		float end_offset; //offset from end, if 0 then full length or infinite
+		float start_offset = 0.0; //offset from start
+		float end_offset = 0.0; //offset from end, if 0 then full length or infinite
 		AudioKey() {
-			start_offset = 0;
-			end_offset = 0;
 		}
 	};
 
@@ -217,9 +205,9 @@ private:
 	_FORCE_INLINE_ void _value_track_get_key_indices_in_range(const ValueTrack *vt, float from_time, float to_time, List<int> *p_indices) const;
 	_FORCE_INLINE_ void _method_track_get_key_indices_in_range(const MethodTrack *mt, float from_time, float to_time, List<int> *p_indices) const;
 
-	float length;
-	float step;
-	bool loop;
+	float length = 1.0;
+	float step = 0.1;
+	bool loop = false;
 
 	// bind helpers
 private:
diff --git a/scene/resources/audio_stream_sample.cpp b/scene/resources/audio_stream_sample.cpp
index 8fdb004e65..06a91fb2f8 100644
--- a/scene/resources/audio_stream_sample.cpp
+++ b/scene/resources/audio_stream_sample.cpp
@@ -403,11 +403,7 @@ void AudioStreamPlaybackSample::mix(AudioFrame *p_buffer, float p_rate_scale, in
 	}
 }
 
-AudioStreamPlaybackSample::AudioStreamPlaybackSample() {
-	active = false;
-	offset = 0;
-	sign = 1;
-}
+AudioStreamPlaybackSample::AudioStreamPlaybackSample() {}
 
 /////////////////////
 
@@ -651,16 +647,7 @@ void AudioStreamSample::_bind_methods() {
 	BIND_ENUM_CONSTANT(LOOP_BACKWARD);
 }
 
-AudioStreamSample::AudioStreamSample() {
-	format = FORMAT_8_BITS;
-	loop_mode = LOOP_DISABLED;
-	stereo = false;
-	loop_begin = 0;
-	loop_end = 0;
-	mix_rate = 44100;
-	data = nullptr;
-	data_bytes = 0;
-}
+AudioStreamSample::AudioStreamSample() {}
 
 AudioStreamSample::~AudioStreamSample() {
 	if (data) {
diff --git a/scene/resources/audio_stream_sample.h b/scene/resources/audio_stream_sample.h
index ba475c0888..70b8ba79ad 100644
--- a/scene/resources/audio_stream_sample.h
+++ b/scene/resources/audio_stream_sample.h
@@ -44,19 +44,19 @@ class AudioStreamPlaybackSample : public AudioStreamPlayback {
 	};
 
 	struct IMA_ADPCM_State {
-		int16_t step_index;
-		int32_t predictor;
+		int16_t step_index = 0;
+		int32_t predictor = 0;
 		/* values at loop point */
-		int16_t loop_step_index;
-		int32_t loop_predictor;
-		int32_t last_nibble;
-		int32_t loop_pos;
-		int32_t window_ofs;
+		int16_t loop_step_index = 0;
+		int32_t loop_predictor = 0;
+		int32_t last_nibble = 0;
+		int32_t loop_pos = 0;
+		int32_t window_ofs = 0;
 	} ima_adpcm[2];
 
-	int64_t offset;
-	int sign;
-	bool active;
+	int64_t offset = 0;
+	int sign = 1;
+	bool active = false;
 	friend class AudioStreamSample;
 	Ref<AudioStreamSample> base;
 
@@ -103,14 +103,14 @@ private:
 		DATA_PAD = 16 //padding for interpolation
 	};
 
-	Format format;
-	LoopMode loop_mode;
-	bool stereo;
-	int loop_begin;
-	int loop_end;
-	int mix_rate;
-	void *data;
-	uint32_t data_bytes;
+	Format format = FORMAT_8_BITS;
+	LoopMode loop_mode = LOOP_DISABLED;
+	bool stereo = false;
+	int loop_begin = 0;
+	int loop_end = 0;
+	int mix_rate = 44100;
+	void *data = nullptr;
+	uint32_t data_bytes = 0;
 
 protected:
 	static void _bind_methods();
diff --git a/scene/resources/bit_map.cpp b/scene/resources/bit_map.cpp
index dfb7a1fdfb..8ffc7b4b4c 100644
--- a/scene/resources/bit_map.cpp
+++ b/scene/resources/bit_map.cpp
@@ -346,7 +346,7 @@ static Vector<Vector2> rdp(const Vector<Vector2> &v, float optimization) {
 	}
 
 	int index = -1;
-	float dist = 0;
+	float dist = 0.0;
 	//not looping first and last point
 	for (size_t i = 1, size = v.size(); i < size - 1; ++i) {
 		float cdist = perpendicular_distance(v[i], v[0], v[v.size() - 1]);
@@ -406,8 +406,8 @@ static Vector<Vector2> reduce(const Vector<Vector2> &points, const Rect2i &rect,
 
 struct FillBitsStackEntry {
 	Point2i pos;
-	int i;
-	int j;
+	int i = 0;
+	int j = 0;
 };
 
 static void fill_bits(const BitMap *p_src, Ref<BitMap> &p_map, const Point2i &p_pos, const Rect2i &rect) {
@@ -677,9 +677,6 @@ void BitMap::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::DICTIONARY, "data", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NOEDITOR | PROPERTY_USAGE_INTERNAL), "_set_data", "_get_data");
 }
 
-BitMap::BitMap() {
-	width = 0;
-	height = 0;
-}
+BitMap::BitMap() {}
 
 //////////////////////////////////////
diff --git a/scene/resources/bit_map.h b/scene/resources/bit_map.h
index 7414265cee..68fd0b999a 100644
--- a/scene/resources/bit_map.h
+++ b/scene/resources/bit_map.h
@@ -40,8 +40,8 @@ class BitMap : public Resource {
 	OBJ_SAVE_TYPE(BitMap);
 
 	Vector<uint8_t> bitmask;
-	int width;
-	int height;
+	int width = 0;
+	int height = 0;
 
 	Vector<Vector2> _march_square(const Rect2i &rect, const Point2i &start) const;
 
diff --git a/scene/resources/camera_effects.h b/scene/resources/camera_effects.h
index cf12b6d3c0..28aa6b8660 100644
--- a/scene/resources/camera_effects.h
+++ b/scene/resources/camera_effects.h
@@ -42,12 +42,12 @@ private:
 
 	// DOF blur
 	bool dof_blur_far_enabled = false;
-	float dof_blur_far_distance = 10;
-	float dof_blur_far_transition = 5;
+	float dof_blur_far_distance = 10.0;
+	float dof_blur_far_transition = 5.0;
 
 	bool dof_blur_near_enabled = false;
-	float dof_blur_near_distance = 2;
-	float dof_blur_near_transition = 1;
+	float dof_blur_near_distance = 2.0;
+	float dof_blur_near_transition = 1.0;
 
 	float dof_blur_amount = 0.1;
 	void _update_dof_blur();
diff --git a/scene/resources/capsule_shape_2d.cpp b/scene/resources/capsule_shape_2d.cpp
index 63d90a8364..3725d855f4 100644
--- a/scene/resources/capsule_shape_2d.cpp
+++ b/scene/resources/capsule_shape_2d.cpp
@@ -112,7 +112,5 @@ void CapsuleShape2D::_bind_methods() {
 
 CapsuleShape2D::CapsuleShape2D() :
 		Shape2D(PhysicsServer2D::get_singleton()->capsule_shape_create()) {
-	radius = 10;
-	height = 20;
 	_update_shape();
 }
diff --git a/scene/resources/capsule_shape_2d.h b/scene/resources/capsule_shape_2d.h
index 8c8c1b259b..439b67e8c3 100644
--- a/scene/resources/capsule_shape_2d.h
+++ b/scene/resources/capsule_shape_2d.h
@@ -36,8 +36,8 @@
 class CapsuleShape2D : public Shape2D {
 	GDCLASS(CapsuleShape2D, Shape2D);
 
-	real_t height;
-	real_t radius;
+	real_t height = 20.0;
+	real_t radius = 10.0;
 
 	void _update_shape();
 	Vector<Vector2> _get_points() const;
diff --git a/scene/resources/capsule_shape_3d.cpp b/scene/resources/capsule_shape_3d.cpp
index a0b454a00f..3f937cdc7a 100644
--- a/scene/resources/capsule_shape_3d.cpp
+++ b/scene/resources/capsule_shape_3d.cpp
@@ -112,7 +112,5 @@ void CapsuleShape3D::_bind_methods() {
 
 CapsuleShape3D::CapsuleShape3D() :
 		Shape3D(PhysicsServer3D::get_singleton()->shape_create(PhysicsServer3D::SHAPE_CAPSULE)) {
-	radius = 1.0;
-	height = 1.0;
 	_update_shape();
 }
diff --git a/scene/resources/capsule_shape_3d.h b/scene/resources/capsule_shape_3d.h
index b5b8912445..25645ecf9d 100644
--- a/scene/resources/capsule_shape_3d.h
+++ b/scene/resources/capsule_shape_3d.h
@@ -35,8 +35,8 @@
 
 class CapsuleShape3D : public Shape3D {
 	GDCLASS(CapsuleShape3D, Shape3D);
-	float radius;
-	float height;
+	float radius = 1.0;
+	float height = 1.0;
 
 protected:
 	static void _bind_methods();
diff --git a/scene/resources/circle_shape_2d.cpp b/scene/resources/circle_shape_2d.cpp
index a44c1b68bf..735bf47482 100644
--- a/scene/resources/circle_shape_2d.cpp
+++ b/scene/resources/circle_shape_2d.cpp
@@ -83,6 +83,5 @@ void CircleShape2D::draw(const RID &p_to_rid, const Color &p_color) {
 
 CircleShape2D::CircleShape2D() :
 		Shape2D(PhysicsServer2D::get_singleton()->circle_shape_create()) {
-	radius = 10;
 	_update_shape();
 }
diff --git a/scene/resources/circle_shape_2d.h b/scene/resources/circle_shape_2d.h
index a066b773ef..333f299236 100644
--- a/scene/resources/circle_shape_2d.h
+++ b/scene/resources/circle_shape_2d.h
@@ -36,7 +36,7 @@
 class CircleShape2D : public Shape2D {
 	GDCLASS(CircleShape2D, Shape2D);
 
-	real_t radius;
+	real_t radius = 10.0;
 	void _update_shape();
 
 protected:
diff --git a/scene/resources/concave_polygon_shape_2d.cpp b/scene/resources/concave_polygon_shape_2d.cpp
index 3d6df3bb9c..0c767c8a52 100644
--- a/scene/resources/concave_polygon_shape_2d.cpp
+++ b/scene/resources/concave_polygon_shape_2d.cpp
@@ -98,7 +98,7 @@ Rect2 ConcavePolygonShape2D::get_rect() const {
 real_t ConcavePolygonShape2D::get_enclosing_radius() const {
 	Vector<Vector2> data = get_segments();
 	const Vector2 *read = data.ptr();
-	real_t r = 0;
+	real_t r = 0.0;
 	for (int i(0); i < data.size(); i++) {
 		r = MAX(read[i].length_squared(), r);
 	}
diff --git a/scene/resources/concave_polygon_shape_3d.cpp b/scene/resources/concave_polygon_shape_3d.cpp
index 358c99ad09..f067695d7d 100644
--- a/scene/resources/concave_polygon_shape_3d.cpp
+++ b/scene/resources/concave_polygon_shape_3d.cpp
@@ -63,7 +63,7 @@ Vector<Vector3> ConcavePolygonShape3D::get_debug_mesh_lines() const {
 real_t ConcavePolygonShape3D::get_enclosing_radius() const {
 	Vector<Vector3> data = get_faces();
 	const Vector3 *read = data.ptr();
-	real_t r = 0;
+	real_t r = 0.0;
 	for (int i(0); i < data.size(); i++) {
 		r = MAX(read[i].length_squared(), r);
 	}
diff --git a/scene/resources/convex_polygon_shape_2d.cpp b/scene/resources/convex_polygon_shape_2d.cpp
index 656e064356..b4b200a7ff 100644
--- a/scene/resources/convex_polygon_shape_2d.cpp
+++ b/scene/resources/convex_polygon_shape_2d.cpp
@@ -91,7 +91,7 @@ Rect2 ConvexPolygonShape2D::get_rect() const {
 }
 
 real_t ConvexPolygonShape2D::get_enclosing_radius() const {
-	real_t r = 0;
+	real_t r = 0.0;
 	for (int i(0); i < get_points().size(); i++) {
 		r = MAX(get_points()[i].length_squared(), r);
 	}
diff --git a/scene/resources/convex_polygon_shape_3d.cpp b/scene/resources/convex_polygon_shape_3d.cpp
index 770d547231..9e030bc077 100644
--- a/scene/resources/convex_polygon_shape_3d.cpp
+++ b/scene/resources/convex_polygon_shape_3d.cpp
@@ -56,7 +56,7 @@ Vector<Vector3> ConvexPolygonShape3D::get_debug_mesh_lines() const {
 real_t ConvexPolygonShape3D::get_enclosing_radius() const {
 	Vector<Vector3> data = get_points();
 	const Vector3 *read = data.ptr();
-	real_t r = 0;
+	real_t r = 0.0;
 	for (int i(0); i < data.size(); i++) {
 		r = MAX(read[i].length_squared(), r);
 	}
diff --git a/scene/resources/curve.cpp b/scene/resources/curve.cpp
index 123c77a036..bc479e557a 100644
--- a/scene/resources/curve.cpp
+++ b/scene/resources/curve.cpp
@@ -47,11 +47,6 @@ static _FORCE_INLINE_ T _bezier_interp(real_t t, T start, T control_1, T control
 const char *Curve::SIGNAL_RANGE_CHANGED = "range_changed";
 
 Curve::Curve() {
-	_bake_resolution = 100;
-	_baked_cache_dirty = false;
-	_min_value = 0;
-	_max_value = 1;
-	_minmax_set_once = 0b00;
 }
 
 int Curve::add_point(Vector2 p_pos, real_t left_tangent, real_t right_tangent, TangentMode left_mode, TangentMode right_mode) {
@@ -683,7 +678,7 @@ void Curve2D::_bake() const {
 
 	for (int i = 0; i < points.size() - 1; i++) {
 		float step = 0.1; // at least 10 substeps ought to be enough?
-		float p = 0;
+		float p = 0.0;
 
 		while (p < 1.0) {
 			float np = p + step;
@@ -993,12 +988,9 @@ void Curve2D::_bind_methods() {
 }
 
 Curve2D::Curve2D() {
-	baked_cache_dirty = false;
-	baked_max_ofs = 0;
 	/*	add_point(Vector2(-1,0,0));
 	add_point(Vector2(0,2,0));
 	add_point(Vector2(0,3,5));*/
-	bake_interval = 5;
 }
 
 /***********************************************************************************/
@@ -1178,7 +1170,7 @@ void Curve3D::_bake() const {
 
 	for (int i = 0; i < points.size() - 1; i++) {
 		float step = 0.1; // at least 10 substeps ought to be enough?
-		float p = 0;
+		float p = 0.0;
 
 		while (p < 1.0) {
 			float np = p + step;
@@ -1669,11 +1661,7 @@ void Curve3D::_bind_methods() {
 }
 
 Curve3D::Curve3D() {
-	baked_cache_dirty = false;
-	baked_max_ofs = 0;
 	/*	add_point(Vector3(-1,0,0));
 	add_point(Vector3(0,2,0));
 	add_point(Vector3(0,3,5));*/
-	bake_interval = 0.2;
-	up_vector_enabled = true;
 }
diff --git a/scene/resources/curve.h b/scene/resources/curve.h
index f33f3c5abe..402c893cd8 100644
--- a/scene/resources/curve.h
+++ b/scene/resources/curve.h
@@ -51,21 +51,17 @@ public:
 
 	struct Point {
 		Vector2 pos;
-		real_t left_tangent;
-		real_t right_tangent;
-		TangentMode left_mode;
-		TangentMode right_mode;
+		real_t left_tangent = 0.0;
+		real_t right_tangent = 0.0;
+		TangentMode left_mode = TANGENT_FREE;
+		TangentMode right_mode = TANGENT_FREE;
 
 		Point() {
-			left_tangent = 0;
-			right_tangent = 0;
-			left_mode = TANGENT_FREE;
-			right_mode = TANGENT_FREE;
 		}
 
 		Point(Vector2 p_pos,
-				real_t p_left = 0,
-				real_t p_right = 0,
+				real_t p_left = 0.0,
+				real_t p_right = 0.0,
 				TangentMode p_left_mode = TANGENT_FREE,
 				TangentMode p_right_mode = TANGENT_FREE) {
 			pos = p_pos;
@@ -137,12 +133,12 @@ private:
 	void mark_dirty();
 
 	Vector<Point> _points;
-	bool _baked_cache_dirty;
+	bool _baked_cache_dirty = false;
 	Vector<real_t> _baked_cache;
-	int _bake_resolution;
-	float _min_value;
-	float _max_value;
-	int _minmax_set_once; // Encodes whether min and max have been set a first time, first bit for min and second for max.
+	int _bake_resolution = 100;
+	float _min_value = 0.0;
+	float _max_value = 1.0;
+	int _minmax_set_once = 0b00; // Encodes whether min and max have been set a first time, first bit for min and second for max.
 };
 
 VARIANT_ENUM_CAST(Curve::TangentMode)
@@ -159,17 +155,17 @@ class Curve2D : public Resource {
 	Vector<Point> points;
 
 	struct BakedPoint {
-		float ofs;
+		float ofs = 0.0;
 		Vector2 point;
 	};
 
-	mutable bool baked_cache_dirty;
+	mutable bool baked_cache_dirty = false;
 	mutable PackedVector2Array baked_point_cache;
-	mutable float baked_max_ofs;
+	mutable float baked_max_ofs = 0.0;
 
 	void _bake() const;
 
-	float bake_interval;
+	float bake_interval = 5.0;
 
 	void _bake_segment2d(Map<float, Vector2> &r_bake, float p_begin, float p_end, const Vector2 &p_a, const Vector2 &p_out, const Vector2 &p_b, const Vector2 &p_in, int p_depth, int p_max_depth, float p_tol) const;
 	Dictionary _get_data() const;
@@ -214,28 +210,26 @@ class Curve3D : public Resource {
 		Vector3 in;
 		Vector3 out;
 		Vector3 pos;
-		float tilt;
-
-		Point() { tilt = 0; }
+		float tilt = 0.0;
 	};
 
 	Vector<Point> points;
 
 	struct BakedPoint {
-		float ofs;
+		float ofs = 0.0;
 		Vector3 point;
 	};
 
-	mutable bool baked_cache_dirty;
+	mutable bool baked_cache_dirty = false;
 	mutable PackedVector3Array baked_point_cache;
 	mutable PackedFloat32Array baked_tilt_cache;
 	mutable PackedVector3Array baked_up_vector_cache;
-	mutable float baked_max_ofs;
+	mutable float baked_max_ofs = 0.0;
 
 	void _bake() const;
 
-	float bake_interval;
-	bool up_vector_enabled;
+	float bake_interval = 0.2;
+	bool up_vector_enabled = true;
 
 	void _bake_segment3d(Map<float, Vector3> &r_bake, float p_begin, float p_end, const Vector3 &p_a, const Vector3 &p_out, const Vector3 &p_b, const Vector3 &p_in, int p_depth, int p_max_depth, float p_tol) const;
 	Dictionary _get_data() const;
diff --git a/scene/resources/cylinder_shape_3d.cpp b/scene/resources/cylinder_shape_3d.cpp
index 3e9cdca872..bd256d4bef 100644
--- a/scene/resources/cylinder_shape_3d.cpp
+++ b/scene/resources/cylinder_shape_3d.cpp
@@ -105,7 +105,5 @@ void CylinderShape3D::_bind_methods() {
 
 CylinderShape3D::CylinderShape3D() :
 		Shape3D(PhysicsServer3D::get_singleton()->shape_create(PhysicsServer3D::SHAPE_CYLINDER)) {
-	radius = 1.0;
-	height = 2.0;
 	_update_shape();
 }
diff --git a/scene/resources/cylinder_shape_3d.h b/scene/resources/cylinder_shape_3d.h
index 93e8345727..d1b8364672 100644
--- a/scene/resources/cylinder_shape_3d.h
+++ b/scene/resources/cylinder_shape_3d.h
@@ -35,8 +35,8 @@
 
 class CylinderShape3D : public Shape3D {
 	GDCLASS(CylinderShape3D, Shape3D);
-	float radius;
-	float height;
+	float radius = 1.0;
+	float height = 2.0;
 
 protected:
 	static void _bind_methods();
diff --git a/scene/resources/default_theme/default_theme.cpp b/scene/resources/default_theme/default_theme.cpp
index a0b65e9799..31bc00e528 100644
--- a/scene/resources/default_theme/default_theme.cpp
+++ b/scene/resources/default_theme/default_theme.cpp
@@ -43,7 +43,7 @@
 typedef Map<const void *, Ref<ImageTexture>> TexCacheMap;
 
 static TexCacheMap *tex_cache;
-static float scale = 1;
+static float scale = 1.0;
 
 template <class T>
 static Ref<StyleBoxTexture> make_stylebox(T p_src, float p_left, float p_top, float p_right, float p_bottom, float p_margin_left = -1, float p_margin_top = -1, float p_margin_right = -1, float p_margin_bottom = -1, bool p_draw_center = true) {
diff --git a/scene/resources/environment.h b/scene/resources/environment.h
index 62236d8362..0df2c3cc27 100644
--- a/scene/resources/environment.h
+++ b/scene/resources/environment.h
@@ -103,7 +103,7 @@ private:
 	// Background
 	BGMode bg_mode = BG_CLEAR_COLOR;
 	Ref<Sky> bg_sky;
-	float bg_sky_custom_fov = 0;
+	float bg_sky_custom_fov = 0.0;
 	Vector3 bg_sky_rotation;
 	Color bg_color;
 	float bg_energy = 1.0;
@@ -125,7 +125,7 @@ private:
 	float tonemap_white = 1.0;
 	bool tonemap_auto_exposure_enabled = false;
 	float tonemap_auto_exposure_min = 0.05;
-	float tonemap_auto_exposure_max = 8;
+	float tonemap_auto_exposure_max = 8.0;
 	float tonemap_auto_exposure_speed = 0.5;
 	float tonemap_auto_exposure_grey = 0.4;
 	void _update_tonemap();
diff --git a/scene/resources/gradient.cpp b/scene/resources/gradient.cpp
index b87235518f..7b9b942142 100644
--- a/scene/resources/gradient.cpp
+++ b/scene/resources/gradient.cpp
@@ -39,7 +39,6 @@ Gradient::Gradient() {
 	points.write[0].offset = 0;
 	points.write[1].color = Color(1, 1, 1, 1);
 	points.write[1].offset = 1;
-	is_sorted = true;
 }
 
 Gradient::~Gradient() {
diff --git a/scene/resources/gradient.h b/scene/resources/gradient.h
index 344a3fd283..cf5b179c45 100644
--- a/scene/resources/gradient.h
+++ b/scene/resources/gradient.h
@@ -39,7 +39,7 @@ class Gradient : public Resource {
 
 public:
 	struct Point {
-		float offset;
+		float offset = 0.0;
 		Color color;
 		bool operator<(const Point &p_ponit) const {
 			return offset < p_ponit.offset;
@@ -48,7 +48,7 @@ public:
 
 private:
 	Vector<Point> points;
-	bool is_sorted;
+	bool is_sorted = true;
 	_FORCE_INLINE_ void _update_sorting() {
 		if (!is_sorted) {
 			points.sort();
diff --git a/scene/resources/height_map_shape_3d.cpp b/scene/resources/height_map_shape_3d.cpp
index a32cc1c4df..33a581cc5e 100644
--- a/scene/resources/height_map_shape_3d.cpp
+++ b/scene/resources/height_map_shape_3d.cpp
@@ -193,16 +193,12 @@ void HeightMapShape3D::_bind_methods() {
 
 HeightMapShape3D::HeightMapShape3D() :
 		Shape3D(PhysicsServer3D::get_singleton()->shape_create(PhysicsServer3D::SHAPE_HEIGHTMAP)) {
-	map_width = 2;
-	map_depth = 2;
 	map_data.resize(map_width * map_depth);
 	real_t *w = map_data.ptrw();
 	w[0] = 0.0;
 	w[1] = 0.0;
 	w[2] = 0.0;
 	w[3] = 0.0;
-	min_height = 0.0;
-	max_height = 0.0;
 
 	_update_shape();
 }
diff --git a/scene/resources/height_map_shape_3d.h b/scene/resources/height_map_shape_3d.h
index eda405fc06..6fc88cff90 100644
--- a/scene/resources/height_map_shape_3d.h
+++ b/scene/resources/height_map_shape_3d.h
@@ -36,11 +36,11 @@
 class HeightMapShape3D : public Shape3D {
 	GDCLASS(HeightMapShape3D, Shape3D);
 
-	int map_width;
-	int map_depth;
+	int map_width = 2;
+	int map_depth = 2;
 	PackedFloat32Array map_data;
-	float min_height;
-	float max_height;
+	float min_height = 0.0;
+	float max_height = 0.0;
 
 protected:
 	static void _bind_methods();
diff --git a/scene/resources/line_shape_2d.cpp b/scene/resources/line_shape_2d.cpp
index 2b08c21c34..d206f12287 100644
--- a/scene/resources/line_shape_2d.cpp
+++ b/scene/resources/line_shape_2d.cpp
@@ -113,7 +113,5 @@ void LineShape2D::_bind_methods() {
 
 LineShape2D::LineShape2D() :
 		Shape2D(PhysicsServer2D::get_singleton()->line_shape_create()) {
-	normal = Vector2(0, 1);
-	distance = 0;
 	_update_shape();
 }
diff --git a/scene/resources/line_shape_2d.h b/scene/resources/line_shape_2d.h
index 043be1eebe..9f0405ad29 100644
--- a/scene/resources/line_shape_2d.h
+++ b/scene/resources/line_shape_2d.h
@@ -36,8 +36,8 @@
 class LineShape2D : public Shape2D {
 	GDCLASS(LineShape2D, Shape2D);
 
-	Vector2 normal;
-	real_t distance;
+	Vector2 normal = Vector2(0, 1);
+	real_t distance = 0.0;
 
 	void _update_shape();
 
diff --git a/scene/resources/material.cpp b/scene/resources/material.cpp
index 92d2fb1c6d..e043c4ad24 100644
--- a/scene/resources/material.cpp
+++ b/scene/resources/material.cpp
@@ -2655,9 +2655,6 @@ BaseMaterial3D::BaseMaterial3D(bool p_orm) :
 		element(this) {
 	orm = p_orm;
 	// Initialize to the same values as the shader
-	shading_mode = SHADING_MODE_PER_PIXEL;
-	transparency = TRANSPARENCY_DISABLED;
-	alpha_antialiasing_mode = ALPHA_ANTIALIASING_OFF;
 	set_albedo(Color(1.0, 1.0, 1.0, 1.0));
 	set_specular(0.5);
 	set_roughness(1.0);
@@ -2689,7 +2686,6 @@ BaseMaterial3D::BaseMaterial3D(bool p_orm) :
 	set_particles_anim_h_frames(1);
 	set_particles_anim_v_frames(1);
 	set_particles_anim_loop(false);
-	emission_op = EMISSION_OP_ADD;
 
 	set_transparency(TRANSPARENCY_DISABLED);
 	set_alpha_antialiasing(ALPHA_ANTIALIASING_OFF);
@@ -2697,8 +2693,6 @@ BaseMaterial3D::BaseMaterial3D(bool p_orm) :
 	set_alpha_hash_scale(1.0);
 	set_alpha_antialiasing_edge(0.3);
 
-	proximity_fade_enabled = false;
-	distance_fade = DISTANCE_FADE_DISABLED;
 	set_proximity_fade_distance(1);
 	set_distance_fade_min_distance(0);
 	set_distance_fade_max_distance(10);
@@ -2710,35 +2704,14 @@ BaseMaterial3D::BaseMaterial3D(bool p_orm) :
 	set_ao_texture_channel(TEXTURE_CHANNEL_RED);
 	set_refraction_texture_channel(TEXTURE_CHANNEL_RED);
 
-	grow_enabled = false;
 	set_grow(0.0);
 
-	deep_parallax = false;
-	heightmap_parallax_flip_tangent = false;
-	heightmap_parallax_flip_binormal = false;
 	set_heightmap_deep_parallax_min_layers(8);
 	set_heightmap_deep_parallax_max_layers(32);
 	set_heightmap_deep_parallax_flip_tangent(false); //also sets binormal
 
-	detail_uv = DETAIL_UV_1;
-	blend_mode = BLEND_MODE_MIX;
-	detail_blend_mode = BLEND_MODE_MIX;
-	depth_draw_mode = DEPTH_DRAW_OPAQUE_ONLY;
-	cull_mode = CULL_BACK;
-	for (int i = 0; i < FLAG_MAX; i++) {
-		flags[i] = false;
-	}
 	flags[FLAG_USE_TEXTURE_REPEAT] = true;
 
-	diffuse_mode = DIFFUSE_BURLEY;
-	specular_mode = SPECULAR_SCHLICK_GGX;
-
-	for (int i = 0; i < FEATURE_MAX; i++) {
-		features[i] = false;
-	}
-
-	texture_filter = TEXTURE_FILTER_LINEAR_WITH_MIPMAPS;
-
 	_queue_shader_change();
 }
 
diff --git a/scene/resources/material.h b/scene/resources/material.h
index 0048b43c8b..595db36a57 100644
--- a/scene/resources/material.h
+++ b/scene/resources/material.h
@@ -330,7 +330,7 @@ private:
 
 	struct ShaderData {
 		RID shader;
-		int users;
+		int users = 0;
 	};
 
 	static Map<MaterialKey, ShaderData> shader_map;
@@ -468,16 +468,16 @@ private:
 	float alpha_scissor_threshold;
 	float alpha_hash_scale;
 	float alpha_antialiasing_edge;
-	bool grow_enabled;
+	bool grow_enabled = false;
 	float ao_light_affect;
 	float grow;
 	int particles_anim_h_frames;
 	int particles_anim_v_frames;
 	bool particles_anim_loop;
-	Transparency transparency;
-	ShadingMode shading_mode;
+	Transparency transparency = TRANSPARENCY_DISABLED;
+	ShadingMode shading_mode = SHADING_MODE_PER_PIXEL;
 
-	TextureFilter texture_filter;
+	TextureFilter texture_filter = TEXTURE_FILTER_LINEAR_WITH_MIPMAPS;
 
 	Vector3 uv1_scale;
 	Vector3 uv1_offset;
@@ -487,37 +487,37 @@ private:
 	Vector3 uv2_offset;
 	float uv2_triplanar_sharpness;
 
-	DetailUV detail_uv;
+	DetailUV detail_uv = DETAIL_UV_1;
 
-	bool deep_parallax;
+	bool deep_parallax = false;
 	int deep_parallax_min_layers;
 	int deep_parallax_max_layers;
-	bool heightmap_parallax_flip_tangent;
-	bool heightmap_parallax_flip_binormal;
+	bool heightmap_parallax_flip_tangent = false;
+	bool heightmap_parallax_flip_binormal = false;
 
-	bool proximity_fade_enabled;
+	bool proximity_fade_enabled = false;
 	float proximity_fade_distance;
 
-	DistanceFadeMode distance_fade;
+	DistanceFadeMode distance_fade = DISTANCE_FADE_DISABLED;
 	float distance_fade_max_distance;
 	float distance_fade_min_distance;
 
-	BlendMode blend_mode;
-	BlendMode detail_blend_mode;
-	DepthDrawMode depth_draw_mode;
-	CullMode cull_mode;
-	bool flags[FLAG_MAX];
-	SpecularMode specular_mode;
-	DiffuseMode diffuse_mode;
+	BlendMode blend_mode = BLEND_MODE_MIX;
+	BlendMode detail_blend_mode = BLEND_MODE_MIX;
+	DepthDrawMode depth_draw_mode = DEPTH_DRAW_OPAQUE_ONLY;
+	CullMode cull_mode = CULL_BACK;
+	bool flags[FLAG_MAX] = {};
+	SpecularMode specular_mode = SPECULAR_SCHLICK_GGX;
+	DiffuseMode diffuse_mode = DIFFUSE_BURLEY;
 	BillboardMode billboard_mode;
-	EmissionOperator emission_op;
+	EmissionOperator emission_op = EMISSION_OP_ADD;
 
 	TextureChannel metallic_texture_channel;
 	TextureChannel roughness_texture_channel;
 	TextureChannel ao_texture_channel;
 	TextureChannel refraction_texture_channel;
 
-	AlphaAntiAliasing alpha_antialiasing_mode;
+	AlphaAntiAliasing alpha_antialiasing_mode = ALPHA_ANTIALIASING_OFF;
 
 	bool features[FEATURE_MAX];
 
diff --git a/scene/resources/mesh.cpp b/scene/resources/mesh.cpp
index e812ad3a01..fc23a8e65b 100644
--- a/scene/resources/mesh.cpp
+++ b/scene/resources/mesh.cpp
@@ -1375,8 +1375,8 @@ bool (*array_mesh_lightmap_unwrap_callback)(float p_texel_size, const float *p_v
 struct ArrayMeshLightmapSurface {
 	Ref<Material> material;
 	LocalVector<SurfaceTool::Vertex> vertices;
-	Mesh::PrimitiveType primitive;
-	uint32_t format;
+	Mesh::PrimitiveType primitive = Mesh::PrimitiveType::PRIMITIVE_MAX;
+	uint32_t format = 0;
 };
 
 Error ArrayMesh::lightmap_unwrap(const Transform &p_base_transform, float p_texel_size) {
@@ -1639,7 +1639,6 @@ void ArrayMesh::reload_from_file() {
 ArrayMesh::ArrayMesh() {
 	//mesh is now created on demand
 	//mesh = RenderingServer::get_singleton()->mesh_create();
-	blend_shape_mode = BLEND_SHAPE_MODE_RELATIVE;
 }
 
 ArrayMesh::~ArrayMesh() {
diff --git a/scene/resources/mesh.h b/scene/resources/mesh.h
index 1fd45c880a..8883fb9c2b 100644
--- a/scene/resources/mesh.h
+++ b/scene/resources/mesh.h
@@ -180,20 +180,20 @@ class ArrayMesh : public Mesh {
 
 private:
 	struct Surface {
-		uint32_t format;
-		int array_length;
-		int index_array_length;
-		PrimitiveType primitive;
+		uint32_t format = 0;
+		int array_length = 0;
+		int index_array_length = 0;
+		PrimitiveType primitive = PrimitiveType::PRIMITIVE_MAX;
 
 		String name;
 		AABB aabb;
 		Ref<Material> material;
-		bool is_2d;
+		bool is_2d = false;
 	};
 	Vector<Surface> surfaces;
 	mutable RID mesh;
 	AABB aabb;
-	BlendShapeMode blend_shape_mode;
+	BlendShapeMode blend_shape_mode = BLEND_SHAPE_MODE_RELATIVE;
 	Vector<StringName> blend_shapes;
 	AABB custom_aabb;
 
diff --git a/scene/resources/mesh_data_tool.h b/scene/resources/mesh_data_tool.h
index d8b8d85900..f5c8f11437 100644
--- a/scene/resources/mesh_data_tool.h
+++ b/scene/resources/mesh_data_tool.h
@@ -36,7 +36,7 @@
 class MeshDataTool : public Reference {
 	GDCLASS(MeshDataTool, Reference);
 
-	int format;
+	int format = 0;
 	struct Vertex {
 		Vector3 vertex;
 		Color color;
@@ -54,7 +54,7 @@ class MeshDataTool : public Reference {
 	Vector<Vertex> vertices;
 
 	struct Edge {
-		int vertex[2];
+		int vertex[2] = {};
 		Vector<int> faces;
 		Variant meta;
 	};
@@ -62,8 +62,8 @@ class MeshDataTool : public Reference {
 	Vector<Edge> edges;
 
 	struct Face {
-		int v[3];
-		int edges[3];
+		int v[3] = {};
+		int edges[3] = {};
 		Variant meta;
 	};
 
diff --git a/scene/resources/multimesh.cpp b/scene/resources/multimesh.cpp
index e8e159921c..4991887eb3 100644
--- a/scene/resources/multimesh.cpp
+++ b/scene/resources/multimesh.cpp
@@ -361,11 +361,6 @@ void MultiMesh::_bind_methods() {
 
 MultiMesh::MultiMesh() {
 	multimesh = RenderingServer::get_singleton()->multimesh_create();
-	use_colors = false;
-	use_custom_data = false;
-	transform_format = TRANSFORM_2D;
-	visible_instance_count = -1;
-	instance_count = 0;
 }
 
 MultiMesh::~MultiMesh() {
diff --git a/scene/resources/multimesh.h b/scene/resources/multimesh.h
index 633d754b8e..ca5c42d47a 100644
--- a/scene/resources/multimesh.h
+++ b/scene/resources/multimesh.h
@@ -47,11 +47,11 @@ public:
 private:
 	Ref<Mesh> mesh;
 	RID multimesh;
-	TransformFormat transform_format;
-	bool use_colors;
-	bool use_custom_data;
-	int instance_count;
-	int visible_instance_count;
+	TransformFormat transform_format = TRANSFORM_2D;
+	bool use_colors = false;
+	bool use_custom_data = false;
+	int instance_count = 0;
+	int visible_instance_count = -1;
 
 protected:
 	static void _bind_methods();
diff --git a/scene/resources/navigation_mesh.cpp b/scene/resources/navigation_mesh.cpp
index 43c3ef4edc..a7449fa74f 100644
--- a/scene/resources/navigation_mesh.cpp
+++ b/scene/resources/navigation_mesh.cpp
@@ -510,27 +510,4 @@ void NavigationMesh::_validate_property(PropertyInfo &property) const {
 	}
 }
 
-NavigationMesh::NavigationMesh() {
-	cell_size = 0.3f;
-	cell_height = 0.2f;
-	agent_height = 2.0f;
-	agent_radius = 0.6f;
-	agent_max_climb = 0.9f;
-	agent_max_slope = 45.0f;
-	region_min_size = 8.0f;
-	region_merge_size = 20.0f;
-	edge_max_length = 12.0f;
-	edge_max_error = 1.3f;
-	verts_per_poly = 6.0f;
-	detail_sample_distance = 6.0f;
-	detail_sample_max_error = 1.0f;
-
-	partition_type = SAMPLE_PARTITION_WATERSHED;
-	parsed_geometry_type = PARSED_GEOMETRY_MESH_INSTANCES;
-	collision_mask = 0xFFFFFFFF;
-	source_geometry_mode = SOURCE_GEOMETRY_NAVMESH_CHILDREN;
-	source_group_name = "navmesh";
-	filter_low_hanging_obstacles = false;
-	filter_ledge_spans = false;
-	filter_walkable_low_height_spans = false;
-}
+NavigationMesh::NavigationMesh() {}
diff --git a/scene/resources/navigation_mesh.h b/scene/resources/navigation_mesh.h
index 693c4184bc..966221c7c6 100644
--- a/scene/resources/navigation_mesh.h
+++ b/scene/resources/navigation_mesh.h
@@ -82,30 +82,30 @@ public:
 	};
 
 protected:
-	float cell_size;
-	float cell_height;
-	float agent_height;
-	float agent_radius;
-	float agent_max_climb;
-	float agent_max_slope;
-	float region_min_size;
-	float region_merge_size;
-	float edge_max_length;
-	float edge_max_error;
-	float verts_per_poly;
-	float detail_sample_distance;
-	float detail_sample_max_error;
-
-	SamplePartitionType partition_type;
-	ParsedGeometryType parsed_geometry_type;
-	uint32_t collision_mask;
-
-	SourceGeometryMode source_geometry_mode;
-	StringName source_group_name;
-
-	bool filter_low_hanging_obstacles;
-	bool filter_ledge_spans;
-	bool filter_walkable_low_height_spans;
+	float cell_size = 0.3f;
+	float cell_height = 0.2f;
+	float agent_height = 2.0f;
+	float agent_radius = 0.6f;
+	float agent_max_climb = 0.9f;
+	float agent_max_slope = 45.0f;
+	float region_min_size = 8.0f;
+	float region_merge_size = 20.0f;
+	float edge_max_length = 12.0f;
+	float edge_max_error = 1.3f;
+	float verts_per_poly = 6.0f;
+	float detail_sample_distance = 6.0f;
+	float detail_sample_max_error = 1.0f;
+
+	SamplePartitionType partition_type = SAMPLE_PARTITION_WATERSHED;
+	ParsedGeometryType parsed_geometry_type = PARSED_GEOMETRY_MESH_INSTANCES;
+	uint32_t collision_mask = 0xFFFFFFFF;
+
+	SourceGeometryMode source_geometry_mode = SOURCE_GEOMETRY_NAVMESH_CHILDREN;
+	StringName source_group_name = "navmesh";
+
+	bool filter_low_hanging_obstacles = false;
+	bool filter_ledge_spans = false;
+	bool filter_walkable_low_height_spans = false;
 
 public:
 	// Recast settings
diff --git a/scene/resources/packed_scene.cpp b/scene/resources/packed_scene.cpp
index 794b281100..ef0c3c830b 100644
--- a/scene/resources/packed_scene.cpp
+++ b/scene/resources/packed_scene.cpp
@@ -1589,8 +1589,6 @@ void SceneState::_bind_methods() {
 }
 
 SceneState::SceneState() {
-	base_scene_idx = -1;
-	last_modified_time = 0;
 }
 
 ////////////////
diff --git a/scene/resources/packed_scene.h b/scene/resources/packed_scene.h
index a31dcd8d39..e24b09e77f 100644
--- a/scene/resources/packed_scene.h
+++ b/scene/resources/packed_scene.h
@@ -44,7 +44,7 @@ class SceneState : public Reference {
 	mutable HashMap<NodePath, int> node_path_cache;
 	mutable Map<int, int> base_scene_node_remap;
 
-	int base_scene_idx;
+	int base_scene_idx = -1;
 
 	enum {
 		NO_PARENT_SAVED = 0x7FFFFFFF,
@@ -53,16 +53,16 @@ class SceneState : public Reference {
 	};
 
 	struct NodeData {
-		int parent;
-		int owner;
-		int type;
-		int name;
-		int instance;
-		int index;
+		int parent = 0;
+		int owner = 0;
+		int type = 0;
+		int name = 0;
+		int instance = 0;
+		int index = 0;
 
 		struct Property {
-			int name;
-			int value;
+			int name = 0;
+			int value = 0;
 		};
 
 		Vector<Property> properties;
@@ -71,18 +71,17 @@ class SceneState : public Reference {
 
 	struct PackState {
 		Ref<SceneState> state;
-		int node;
-		PackState() { node = -1; }
+		int node = -1;
 	};
 
 	Vector<NodeData> nodes;
 
 	struct ConnectionData {
-		int from;
-		int to;
-		int signal;
-		int method;
-		int flags;
+		int from = 0;
+		int to = 0;
+		int signal = 0;
+		int method = 0;
+		int flags = 0;
 		Vector<int> binds;
 	};
 
@@ -93,7 +92,7 @@ class SceneState : public Reference {
 
 	String path;
 
-	uint64_t last_modified_time;
+	uint64_t last_modified_time = 0;
 
 	_FORCE_INLINE_ Ref<SceneState> _get_base_scene_state() const;
 
diff --git a/scene/resources/particles_material.cpp b/scene/resources/particles_material.cpp
index c5a295e13f..99d93c0e43 100644
--- a/scene/resources/particles_material.cpp
+++ b/scene/resources/particles_material.cpp
@@ -1370,7 +1370,6 @@ ParticlesMaterial::ParticlesMaterial() :
 	set_emission_box_extents(Vector3(1, 1, 1));
 	set_gravity(Vector3(0, -9.8, 0));
 	set_lifetime_randomness(0);
-	emission_point_count = 1;
 
 	set_sub_emitter_mode(SUB_EMITTER_DISABLED);
 	set_sub_emitter_frequency(4);
@@ -1393,7 +1392,6 @@ ParticlesMaterial::ParticlesMaterial() :
 
 	set_color(Color(1, 1, 1, 1));
 
-	current_key.key = 0;
 	current_key.invalid_key = 1;
 
 	_queue_shader_change();
diff --git a/scene/resources/particles_material.h b/scene/resources/particles_material.h
index 49b48a01b7..3f874bd68c 100644
--- a/scene/resources/particles_material.h
+++ b/scene/resources/particles_material.h
@@ -100,7 +100,7 @@ private:
 			uint32_t collision_scale : 1;
 		};
 
-		uint32_t key;
+		uint32_t key = 0;
 
 		bool operator<(const MaterialKey &p_key) const {
 			return key < p_key.key;
@@ -109,7 +109,7 @@ private:
 
 	struct ShaderData {
 		RID shader;
-		int users;
+		int users = 0;
 	};
 
 	static Map<MaterialKey, ShaderData> shader_map;
@@ -235,7 +235,7 @@ private:
 	Ref<Texture2D> emission_point_texture;
 	Ref<Texture2D> emission_normal_texture;
 	Ref<Texture2D> emission_color_texture;
-	int emission_point_count;
+	int emission_point_count = 1;
 
 	bool anim_loop;
 
diff --git a/scene/resources/physics_material.h b/scene/resources/physics_material.h
index dfb2d1480b..d302800823 100644
--- a/scene/resources/physics_material.h
+++ b/scene/resources/physics_material.h
@@ -39,9 +39,9 @@ class PhysicsMaterial : public Resource {
 	OBJ_SAVE_TYPE(PhysicsMaterial);
 	RES_BASE_EXTENSION("phymat");
 
-	real_t friction = 1;
+	real_t friction = 1.0;
 	bool rough = false;
-	real_t bounce = 0;
+	real_t bounce = 0.0;
 	bool absorbent = false;
 
 protected:
diff --git a/scene/resources/polygon_path_finder.h b/scene/resources/polygon_path_finder.h
index 410e1dba52..2f3cb634fb 100644
--- a/scene/resources/polygon_path_finder.h
+++ b/scene/resources/polygon_path_finder.h
@@ -39,13 +39,13 @@ class PolygonPathFinder : public Resource {
 	struct Point {
 		Vector2 pos;
 		Set<int> connections;
-		float distance;
-		float penalty;
-		int prev;
+		float distance = 0.0;
+		float penalty = 0.0;
+		int prev = 0;
 	};
 
 	struct Edge {
-		int points[2];
+		int points[2] = {};
 
 		_FORCE_INLINE_ bool operator<(const Edge &p_edge) const {
 			if (points[0] == p_edge.points[0]) {
diff --git a/scene/resources/primitive_meshes.cpp b/scene/resources/primitive_meshes.cpp
index 398bce0602..2701198b64 100644
--- a/scene/resources/primitive_meshes.cpp
+++ b/scene/resources/primitive_meshes.cpp
@@ -247,18 +247,7 @@ bool PrimitiveMesh::get_flip_faces() const {
 }
 
 PrimitiveMesh::PrimitiveMesh() {
-	flip_faces = false;
-	// defaults
 	mesh = RenderingServer::get_singleton()->mesh_create();
-
-	// assume primitive triangles as the type, correct for all but one and it will change this :)
-	primitive_type = Mesh::PRIMITIVE_TRIANGLES;
-
-	// make sure we do an update after we've finished constructing our object
-	pending_request = true;
-
-	array_len = 0;
-	index_array_len = 0;
 }
 
 PrimitiveMesh::~PrimitiveMesh() {
@@ -468,13 +457,7 @@ int CapsuleMesh::get_rings() const {
 	return rings;
 }
 
-CapsuleMesh::CapsuleMesh() {
-	// defaults
-	radius = 1.0;
-	mid_height = 1.0;
-	radial_segments = 64;
-	rings = 8;
-}
+CapsuleMesh::CapsuleMesh() {}
 
 /**
   BoxMesh
@@ -725,13 +708,7 @@ int BoxMesh::get_subdivide_depth() const {
 	return subdivide_d;
 }
 
-BoxMesh::BoxMesh() {
-	// defaults
-	size = Vector3(2.0, 2.0, 2.0);
-	subdivide_w = 0;
-	subdivide_h = 0;
-	subdivide_d = 0;
-}
+BoxMesh::BoxMesh() {}
 
 /**
   CylinderMesh
@@ -938,14 +915,7 @@ int CylinderMesh::get_rings() const {
 	return rings;
 }
 
-CylinderMesh::CylinderMesh() {
-	// defaults
-	top_radius = 1.0;
-	bottom_radius = 1.0;
-	height = 2.0;
-	radial_segments = 64;
-	rings = 4;
-}
+CylinderMesh::CylinderMesh() {}
 
 /**
   PlaneMesh
@@ -1053,12 +1023,7 @@ int PlaneMesh::get_subdivide_depth() const {
 	return subdivide_d;
 }
 
-PlaneMesh::PlaneMesh() {
-	// defaults
-	size = Size2(2.0, 2.0);
-	subdivide_w = 0;
-	subdivide_d = 0;
-}
+PlaneMesh::PlaneMesh() {}
 
 /**
   PrismMesh
@@ -1338,14 +1303,7 @@ int PrismMesh::get_subdivide_depth() const {
 	return subdivide_d;
 }
 
-PrismMesh::PrismMesh() {
-	// defaults
-	left_to_right = 0.5;
-	size = Vector3(2.0, 2.0, 2.0);
-	subdivide_w = 0;
-	subdivide_h = 0;
-	subdivide_d = 0;
-}
+PrismMesh::PrismMesh() {}
 
 /**
   QuadMesh
@@ -1409,7 +1367,6 @@ void QuadMesh::_bind_methods() {
 
 QuadMesh::QuadMesh() {
 	primitive_type = PRIMITIVE_TRIANGLES;
-	size = Size2(1.0, 1.0);
 }
 
 void QuadMesh::set_size(const Size2 &p_size) {
@@ -1561,14 +1518,7 @@ bool SphereMesh::get_is_hemisphere() const {
 	return is_hemisphere;
 }
 
-SphereMesh::SphereMesh() {
-	// defaults
-	radius = 1.0;
-	height = 2.0;
-	radial_segments = 64;
-	rings = 32;
-	is_hemisphere = false;
-}
+SphereMesh::SphereMesh() {}
 
 /**
   PointMesh
diff --git a/scene/resources/primitive_meshes.h b/scene/resources/primitive_meshes.h
index d0ca4b10e7..bb3df9d10e 100644
--- a/scene/resources/primitive_meshes.h
+++ b/scene/resources/primitive_meshes.h
@@ -49,17 +49,19 @@ private:
 	mutable AABB aabb;
 	AABB custom_aabb;
 
-	mutable int array_len;
-	mutable int index_array_len;
+	mutable int array_len = 0;
+	mutable int index_array_len = 0;
 
 	Ref<Material> material;
-	bool flip_faces;
+	bool flip_faces = false;
 
-	mutable bool pending_request;
+	// make sure we do an update after we've finished constructing our object
+	mutable bool pending_request = true;
 	void _update() const;
 
 protected:
-	Mesh::PrimitiveType primitive_type;
+	// assume primitive triangles as the type, correct for all but one and it will change this :)
+	Mesh::PrimitiveType primitive_type = Mesh::PRIMITIVE_TRIANGLES;
 
 	static void _bind_methods();
 
@@ -104,10 +106,10 @@ class CapsuleMesh : public PrimitiveMesh {
 	GDCLASS(CapsuleMesh, PrimitiveMesh);
 
 private:
-	float radius;
-	float mid_height;
-	int radial_segments;
-	int rings;
+	float radius = 1.0;
+	float mid_height = 1.0;
+	int radial_segments = 64;
+	int rings = 8;
 
 protected:
 	static void _bind_methods();
@@ -136,10 +138,10 @@ class BoxMesh : public PrimitiveMesh {
 	GDCLASS(BoxMesh, PrimitiveMesh);
 
 private:
-	Vector3 size;
-	int subdivide_w;
-	int subdivide_h;
-	int subdivide_d;
+	Vector3 size = Vector3(2.0, 2.0, 2.0);
+	int subdivide_w = 0;
+	int subdivide_h = 0;
+	int subdivide_d = 0;
 
 protected:
 	static void _bind_methods();
@@ -169,11 +171,11 @@ class CylinderMesh : public PrimitiveMesh {
 	GDCLASS(CylinderMesh, PrimitiveMesh);
 
 private:
-	float top_radius;
-	float bottom_radius;
-	float height;
-	int radial_segments;
-	int rings;
+	float top_radius = 1.0;
+	float bottom_radius = 1.0;
+	float height = 2.0;
+	int radial_segments = 64;
+	int rings = 4;
 
 protected:
 	static void _bind_methods();
@@ -205,9 +207,9 @@ class PlaneMesh : public PrimitiveMesh {
 	GDCLASS(PlaneMesh, PrimitiveMesh);
 
 private:
-	Size2 size;
-	int subdivide_w;
-	int subdivide_d;
+	Size2 size = Size2(2.0, 2.0);
+	int subdivide_w = 0;
+	int subdivide_d = 0;
 
 protected:
 	static void _bind_methods();
@@ -233,11 +235,11 @@ class PrismMesh : public PrimitiveMesh {
 	GDCLASS(PrismMesh, PrimitiveMesh);
 
 private:
-	float left_to_right;
-	Vector3 size;
-	int subdivide_w;
-	int subdivide_h;
-	int subdivide_d;
+	float left_to_right = 0.5;
+	Vector3 size = Vector3(2.0, 2.0, 2.0);
+	int subdivide_w = 0;
+	int subdivide_h = 0;
+	int subdivide_d = 0;
 
 protected:
 	static void _bind_methods();
@@ -270,7 +272,7 @@ class QuadMesh : public PrimitiveMesh {
 	GDCLASS(QuadMesh, PrimitiveMesh);
 
 private:
-	Size2 size;
+	Size2 size = Size2(1.0, 1.0);
 
 protected:
 	static void _bind_methods();
@@ -290,11 +292,11 @@ class SphereMesh : public PrimitiveMesh {
 	GDCLASS(SphereMesh, PrimitiveMesh);
 
 private:
-	float radius;
-	float height;
-	int radial_segments;
-	int rings;
-	bool is_hemisphere;
+	float radius = 1.0;
+	float height = 2.0;
+	int radial_segments = 64;
+	int rings = 32;
+	bool is_hemisphere = false;
 
 protected:
 	static void _bind_methods();
diff --git a/scene/resources/ray_shape_2d.cpp b/scene/resources/ray_shape_2d.cpp
index 98fd160810..d2125445fa 100644
--- a/scene/resources/ray_shape_2d.cpp
+++ b/scene/resources/ray_shape_2d.cpp
@@ -45,7 +45,7 @@ void RayShape2D::draw(const RID &p_to_rid, const Color &p_color) {
 	Vector2 tip = Vector2(0, get_length());
 	RS::get_singleton()->canvas_item_add_line(p_to_rid, Vector2(), tip, p_color, 3);
 	Vector<Vector2> pts;
-	float tsize = 4;
+	float tsize = 4.0;
 	pts.push_back(tip + Vector2(0, tsize));
 	pts.push_back(tip + Vector2(Math_SQRT12 * tsize, 0));
 	pts.push_back(tip + Vector2(-Math_SQRT12 * tsize, 0));
@@ -99,7 +99,5 @@ bool RayShape2D::get_slips_on_slope() const {
 
 RayShape2D::RayShape2D() :
 		Shape2D(PhysicsServer2D::get_singleton()->ray_shape_create()) {
-	length = 20;
-	slips_on_slope = false;
 	_update_shape();
 }
diff --git a/scene/resources/ray_shape_2d.h b/scene/resources/ray_shape_2d.h
index 3570b7be52..56ecfa2722 100644
--- a/scene/resources/ray_shape_2d.h
+++ b/scene/resources/ray_shape_2d.h
@@ -36,8 +36,8 @@
 class RayShape2D : public Shape2D {
 	GDCLASS(RayShape2D, Shape2D);
 
-	real_t length;
-	bool slips_on_slope;
+	real_t length = 20.0;
+	bool slips_on_slope = false;
 
 	void _update_shape();
 
diff --git a/scene/resources/ray_shape_3d.cpp b/scene/resources/ray_shape_3d.cpp
index a332bb575f..e0cecdfc92 100644
--- a/scene/resources/ray_shape_3d.cpp
+++ b/scene/resources/ray_shape_3d.cpp
@@ -87,9 +87,6 @@ void RayShape3D::_bind_methods() {
 
 RayShape3D::RayShape3D() :
 		Shape3D(PhysicsServer3D::get_singleton()->shape_create(PhysicsServer3D::SHAPE_RAY)) {
-	length = 1.0;
-	slips_on_slope = false;
-
 	/* Code copied from setters to prevent the use of uninitialized variables */
 	_update_shape();
 	notify_change_to_owners();
diff --git a/scene/resources/ray_shape_3d.h b/scene/resources/ray_shape_3d.h
index 2c27d56c63..2da6311321 100644
--- a/scene/resources/ray_shape_3d.h
+++ b/scene/resources/ray_shape_3d.h
@@ -34,8 +34,8 @@
 
 class RayShape3D : public Shape3D {
 	GDCLASS(RayShape3D, Shape3D);
-	float length;
-	bool slips_on_slope;
+	float length = 1.0;
+	bool slips_on_slope = false;
 
 protected:
 	static void _bind_methods();
diff --git a/scene/resources/resource_format_text.cpp b/scene/resources/resource_format_text.cpp
index 433e3392e3..f42f957f6e 100644
--- a/scene/resources/resource_format_text.cpp
+++ b/scene/resources/resource_format_text.cpp
@@ -699,18 +699,7 @@ void ResourceLoaderText::set_translation_remapped(bool p_remapped) {
 	translation_remapped = p_remapped;
 }
 
-ResourceLoaderText::ResourceLoaderText() {
-	use_nocache = false;
-
-	resources_total = 0;
-	resource_current = 0;
-
-	progress = nullptr;
-	lines = false;
-	translation_remapped = false;
-	use_sub_threads = false;
-	error = OK;
-}
+ResourceLoaderText::ResourceLoaderText() {}
 
 ResourceLoaderText::~ResourceLoaderText() {
 	memdelete(f);
diff --git a/scene/resources/resource_format_text.h b/scene/resources/resource_format_text.h
index e67a13d41a..3fc7814fe5 100644
--- a/scene/resources/resource_format_text.h
+++ b/scene/resources/resource_format_text.h
@@ -38,12 +38,12 @@
 #include "scene/resources/packed_scene.h"
 
 class ResourceLoaderText {
-	bool translation_remapped;
+	bool translation_remapped = false;
 	String local_path;
 	String res_path;
 	String error_text;
 
-	FileAccess *f;
+	FileAccess *f = nullptr;
 
 	VariantParser::StreamFile stream;
 
@@ -53,28 +53,28 @@ class ResourceLoaderText {
 		String type;
 	};
 
-	bool is_scene;
+	bool is_scene = false;
 	String res_type;
 
-	bool ignore_resource_parsing;
+	bool ignore_resource_parsing = false;
 
 	//Map<String,String> remaps;
 
 	Map<int, ExtResource> ext_resources;
 	Map<int, RES> int_resources;
 
-	int resources_total;
-	int resource_current;
+	int resources_total = 0;
+	int resource_current = 0;
 	String resource_type;
 
 	VariantParser::Tag next_tag;
 
-	bool use_nocache;
+	bool use_nocache = false;
 
-	bool use_sub_threads;
-	float *progress;
+	bool use_sub_threads = false;
+	float *progress = nullptr;
 
-	mutable int lines;
+	mutable int lines = 0;
 
 	Map<String, String> remaps;
 	//void _printerr();
@@ -107,7 +107,7 @@ class ResourceLoaderText {
 
 	friend class ResourceFormatLoaderText;
 
-	Error error;
+	Error error = OK;
 
 	RES resource;
 
@@ -152,11 +152,11 @@ class ResourceFormatSaverTextInstance {
 
 	Ref<PackedScene> packed_scene;
 
-	bool takeover_paths;
-	bool relative_paths;
-	bool bundle_resources;
-	bool skip_editor;
-	FileAccess *f;
+	bool takeover_paths = false;
+	bool relative_paths = false;
+	bool bundle_resources = false;
+	bool skip_editor = false;
+	FileAccess *f = nullptr;
 
 	struct NonPersistentKey { //for resource properties generated on the fly
 		RES base;
@@ -173,7 +173,7 @@ class ResourceFormatSaverTextInstance {
 
 	struct ResourceSort {
 		RES resource;
-		int index;
+		int index = 0;
 		bool operator<(const ResourceSort &p_right) const {
 			return index < p_right.index;
 		}
diff --git a/scene/resources/shader.cpp b/scene/resources/shader.cpp
index 53f3dd1a4b..49d5ac8340 100644
--- a/scene/resources/shader.cpp
+++ b/scene/resources/shader.cpp
@@ -152,9 +152,7 @@ void Shader::_bind_methods() {
 }
 
 Shader::Shader() {
-	mode = MODE_SPATIAL;
 	shader = RenderingServer::get_singleton()->shader_create();
-	params_cache_dirty = true;
 }
 
 Shader::~Shader() {
diff --git a/scene/resources/shader.h b/scene/resources/shader.h
index a3f9330055..bb83d8a032 100644
--- a/scene/resources/shader.h
+++ b/scene/resources/shader.h
@@ -51,12 +51,12 @@ public:
 
 private:
 	RID shader;
-	Mode mode;
+	Mode mode = MODE_SPATIAL;
 
 	// hack the name of performance
 	// shaders keep a list of ShaderMaterial -> RenderingServer name translations, to make
 	// conversion fast and save memory.
-	mutable bool params_cache_dirty;
+	mutable bool params_cache_dirty = true;
 	mutable Map<StringName, StringName> params_cache; //map a shader param to a material param..
 	Map<StringName, Ref<Texture2D>> default_textures;
 
diff --git a/scene/resources/shape_2d.cpp b/scene/resources/shape_2d.cpp
index 6f3897b0cd..f8a5855d33 100644
--- a/scene/resources/shape_2d.cpp
+++ b/scene/resources/shape_2d.cpp
@@ -107,7 +107,6 @@ void Shape2D::_bind_methods() {
 
 Shape2D::Shape2D(const RID &p_rid) {
 	shape = p_rid;
-	custom_bias = 0;
 }
 
 Shape2D::~Shape2D() {
diff --git a/scene/resources/shape_2d.h b/scene/resources/shape_2d.h
index f5814c42f8..7b00e7e426 100644
--- a/scene/resources/shape_2d.h
+++ b/scene/resources/shape_2d.h
@@ -38,7 +38,7 @@ class Shape2D : public Resource {
 	OBJ_SAVE_TYPE(Shape2D);
 
 	RID shape;
-	real_t custom_bias;
+	real_t custom_bias = 0.0;
 
 protected:
 	static void _bind_methods();
diff --git a/scene/resources/skin.cpp b/scene/resources/skin.cpp
index e2df965138..95b63194ed 100644
--- a/scene/resources/skin.cpp
+++ b/scene/resources/skin.cpp
@@ -153,6 +153,4 @@ void Skin::_bind_methods() {
 }
 
 Skin::Skin() {
-	bind_count = 0;
-	binds_ptr = nullptr;
 }
diff --git a/scene/resources/skin.h b/scene/resources/skin.h
index 64fe24bbe4..d5f5e2085b 100644
--- a/scene/resources/skin.h
+++ b/scene/resources/skin.h
@@ -44,8 +44,8 @@ class Skin : public Resource {
 
 	Vector<Bind> binds;
 
-	Bind *binds_ptr;
-	int bind_count;
+	Bind *binds_ptr = nullptr;
+	int bind_count = 0;
 
 protected:
 	bool _set(const StringName &p_name, const Variant &p_value);
diff --git a/scene/resources/sky.cpp b/scene/resources/sky.cpp
index 8fcd92bb89..71424ba8ac 100644
--- a/scene/resources/sky.cpp
+++ b/scene/resources/sky.cpp
@@ -102,8 +102,6 @@ void Sky::_bind_methods() {
 }
 
 Sky::Sky() {
-	mode = PROCESS_MODE_AUTOMATIC;
-	radiance_size = RADIANCE_SIZE_256;
 	sky = RS::get_singleton()->sky_create();
 }
 
diff --git a/scene/resources/sky.h b/scene/resources/sky.h
index 46f645a53d..f0226d321d 100644
--- a/scene/resources/sky.h
+++ b/scene/resources/sky.h
@@ -59,8 +59,8 @@ public:
 
 private:
 	RID sky;
-	ProcessMode mode;
-	RadianceSize radiance_size;
+	ProcessMode mode = PROCESS_MODE_AUTOMATIC;
+	RadianceSize radiance_size = RADIANCE_SIZE_256;
 	Ref<Material> sky_material;
 
 protected:
diff --git a/scene/resources/style_box.cpp b/scene/resources/style_box.cpp
index 7504a05a49..d091af8ac9 100644
--- a/scene/resources/style_box.cpp
+++ b/scene/resources/style_box.cpp
@@ -320,20 +320,9 @@ void StyleBoxTexture::_bind_methods() {
 	BIND_ENUM_CONSTANT(AXIS_STRETCH_MODE_TILE_FIT);
 }
 
-StyleBoxTexture::StyleBoxTexture() {
-	for (int i = 0; i < 4; i++) {
-		margin[i] = 0;
-		expand_margin[i] = 0;
-	}
-	draw_center = true;
-	modulate = Color(1, 1, 1, 1);
+StyleBoxTexture::StyleBoxTexture() {}
 
-	axis_h = AXIS_STRETCH_MODE_STRETCH;
-	axis_v = AXIS_STRETCH_MODE_STRETCH;
-}
-
-StyleBoxTexture::~StyleBoxTexture() {
-}
+StyleBoxTexture::~StyleBoxTexture() {}
 
 ////////////////
 
@@ -888,38 +877,9 @@ void StyleBoxFlat::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "anti_aliasing_size", PROPERTY_HINT_RANGE, "1,5,1"), "set_aa_size", "get_aa_size");
 }
 
-StyleBoxFlat::StyleBoxFlat() {
-	bg_color = Color(0.6, 0.6, 0.6);
-	shadow_color = Color(0, 0, 0, 0.6);
-	border_color = Color(0.8, 0.8, 0.8);
-
-	blend_border = false;
-	draw_center = true;
-	anti_aliased = true;
-
-	shadow_size = 0;
-	shadow_offset = Point2(0, 0);
-	corner_detail = 8;
-	aa_size = 1;
+StyleBoxFlat::StyleBoxFlat() {}
 
-	border_width[0] = 0;
-	border_width[1] = 0;
-	border_width[2] = 0;
-	border_width[3] = 0;
-
-	expand_margin[0] = 0;
-	expand_margin[1] = 0;
-	expand_margin[2] = 0;
-	expand_margin[3] = 0;
-
-	corner_radius[0] = 0;
-	corner_radius[1] = 0;
-	corner_radius[2] = 0;
-	corner_radius[3] = 0;
-}
-
-StyleBoxFlat::~StyleBoxFlat() {
-}
+StyleBoxFlat::~StyleBoxFlat() {}
 
 void StyleBoxLine::set_color(const Color &p_color) {
 	color = p_color;
@@ -1011,12 +971,6 @@ void StyleBoxLine::draw(RID p_canvas_item, const Rect2 &p_rect) const {
 	vs->canvas_item_add_rect(p_canvas_item, r, color);
 }
 
-StyleBoxLine::StyleBoxLine() {
-	grow_begin = 1.0;
-	grow_end = 1.0;
-	thickness = 1;
-	color = Color(0.0, 0.0, 0.0);
-	vertical = false;
-}
+StyleBoxLine::StyleBoxLine() {}
 
 StyleBoxLine::~StyleBoxLine() {}
diff --git a/scene/resources/style_box.h b/scene/resources/style_box.h
index c133f0c825..8a273afbfd 100644
--- a/scene/resources/style_box.h
+++ b/scene/resources/style_box.h
@@ -86,14 +86,14 @@ public:
 	};
 
 private:
-	float expand_margin[4];
-	float margin[4];
+	float expand_margin[4] = {};
+	float margin[4] = {};
 	Rect2 region_rect;
 	Ref<Texture2D> texture;
-	bool draw_center;
-	Color modulate;
-	AxisStretchMode axis_h;
-	AxisStretchMode axis_v;
+	bool draw_center = true;
+	Color modulate = Color(1, 1, 1, 1);
+	AxisStretchMode axis_h = AXIS_STRETCH_MODE_STRETCH;
+	AxisStretchMode axis_v = AXIS_STRETCH_MODE_STRETCH;
 
 protected:
 	virtual float get_style_margin(Side p_side) const override;
@@ -139,22 +139,22 @@ VARIANT_ENUM_CAST(StyleBoxTexture::AxisStretchMode)
 class StyleBoxFlat : public StyleBox {
 	GDCLASS(StyleBoxFlat, StyleBox);
 
-	Color bg_color;
-	Color shadow_color;
-	Color border_color;
+	Color bg_color = Color(0.6, 0.6, 0.6);
+	Color shadow_color = Color(0, 0, 0, 0.6);
+	Color border_color = Color(0.8, 0.8, 0.8);
 
-	int border_width[4];
-	int expand_margin[4];
-	int corner_radius[4];
+	int border_width[4] = {};
+	int expand_margin[4] = {};
+	int corner_radius[4] = {};
 
-	bool draw_center;
-	bool blend_border;
-	bool anti_aliased;
+	bool draw_center = true;
+	bool blend_border = false;
+	bool anti_aliased = true;
 
-	int corner_detail;
-	int shadow_size;
+	int corner_detail = 8;
+	int shadow_size = 0;
 	Point2 shadow_offset;
-	int aa_size;
+	int aa_size = 1;
 
 protected:
 	virtual float get_style_margin(Side p_side) const override;
@@ -231,10 +231,10 @@ public:
 class StyleBoxLine : public StyleBox {
 	GDCLASS(StyleBoxLine, StyleBox);
 	Color color;
-	int thickness;
-	bool vertical;
-	float grow_begin;
-	float grow_end;
+	int thickness = 1;
+	bool vertical = false;
+	float grow_begin = 1.0;
+	float grow_end = 1.0;
 
 protected:
 	virtual float get_style_margin(Side p_side) const override;
diff --git a/scene/resources/surface_tool.cpp b/scene/resources/surface_tool.cpp
index dbf5268762..5ce3532d42 100644
--- a/scene/resources/surface_tool.cpp
+++ b/scene/resources/surface_tool.cpp
@@ -160,7 +160,7 @@ void SurfaceTool::add_vertex(const Vector3 &p_vertex) {
 			//cap
 			weights.resize(expected_vertices);
 			//renormalize
-			float total = 0;
+			float total = 0.0;
 			for (int i = 0; i < expected_vertices; i++) {
 				total += weights[i].weight;
 			}
@@ -1196,12 +1196,7 @@ void SurfaceTool::_bind_methods() {
 }
 
 SurfaceTool::SurfaceTool() {
-	first = false;
-	begun = false;
 	for (int i = 0; i < RS::ARRAY_CUSTOM_COUNT; i++) {
 		last_custom_format[i] = CUSTOM_MAX;
 	}
-	primitive = Mesh::PRIMITIVE_LINES;
-	skin_weights = SKIN_4_WEIGHTS;
-	format = 0;
 }
diff --git a/scene/resources/surface_tool.h b/scene/resources/surface_tool.h
index ea6069e7c1..17efdcba71 100644
--- a/scene/resources/surface_tool.h
+++ b/scene/resources/surface_tool.h
@@ -89,17 +89,17 @@ private:
 	};
 
 	struct WeightSort {
-		int index;
-		float weight;
+		int index = 0;
+		float weight = 0.0;
 		bool operator<(const WeightSort &p_right) const {
 			return weight < p_right.weight;
 		}
 	};
 
-	bool begun;
-	bool first;
-	Mesh::PrimitiveType primitive;
-	uint32_t format;
+	bool begun = false;
+	bool first = false;
+	Mesh::PrimitiveType primitive = Mesh::PRIMITIVE_LINES;
+	uint32_t format = 0;
 	Ref<Material> material;
 	//arrays
 	LocalVector<Vertex> vertex_array;
@@ -115,7 +115,7 @@ private:
 	Plane last_tangent;
 	uint32_t last_smooth_group = 0;
 
-	SkinWeightCount skin_weights;
+	SkinWeightCount skin_weights = SKIN_4_WEIGHTS;
 
 	Color last_custom[RS::ARRAY_CUSTOM_COUNT];
 
diff --git a/scene/resources/syntax_highlighter.h b/scene/resources/syntax_highlighter.h
index c9db8e31a2..f3964b0c8f 100644
--- a/scene/resources/syntax_highlighter.h
+++ b/scene/resources/syntax_highlighter.h
@@ -75,7 +75,7 @@ private:
 		Color color;
 		String start_key;
 		String end_key;
-		bool line_only;
+		bool line_only = false;
 	};
 	Vector<ColorRegion> color_regions;
 	Map<int, int> color_region_cache;
diff --git a/scene/resources/text_line.h b/scene/resources/text_line.h
index 3e0a74a84b..74d4f2c32c 100644
--- a/scene/resources/text_line.h
+++ b/scene/resources/text_line.h
@@ -45,7 +45,7 @@ class TextLine : public Reference {
 
 	bool dirty = true;
 
-	float width = -1;
+	float width = -1.0;
 	uint8_t flags = TextServer::JUSTIFICATION_WORD_BOUND | TextServer::JUSTIFICATION_KASHIDA;
 	HAlign align = HALIGN_LEFT;
 
diff --git a/scene/resources/text_paragraph.h b/scene/resources/text_paragraph.h
index e58c157b01..a16fa8c3c4 100644
--- a/scene/resources/text_paragraph.h
+++ b/scene/resources/text_paragraph.h
@@ -50,7 +50,7 @@ class TextParagraph : public Reference {
 
 	bool dirty_lines = true;
 
-	float width = -1;
+	float width = -1.0;
 	uint8_t flags = TextServer::BREAK_MANDATORY | TextServer::BREAK_WORD_BOUND | TextServer::JUSTIFICATION_WORD_BOUND | TextServer::JUSTIFICATION_KASHIDA;
 	HAlign align = HALIGN_LEFT;
 
diff --git a/scene/resources/texture.cpp b/scene/resources/texture.cpp
index 9a987ae8b1..0d3fa09ba8 100644
--- a/scene/resources/texture.cpp
+++ b/scene/resources/texture.cpp
@@ -310,12 +310,7 @@ void ImageTexture::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("_reload_hook", "rid"), &ImageTexture::_reload_hook);
 }
 
-ImageTexture::ImageTexture() {
-	w = h = 0;
-	image_stored = false;
-	mipmaps = false;
-	format = Image::FORMAT_L8;
-}
+ImageTexture::ImageTexture() {}
 
 ImageTexture::~ImageTexture() {
 	if (texture.is_valid()) {
@@ -733,11 +728,7 @@ void StreamTexture2D::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::STRING, "load_path", PROPERTY_HINT_FILE, "*.stex"), "load", "get_load_path");
 }
 
-StreamTexture2D::StreamTexture2D() {
-	format = Image::FORMAT_MAX;
-	w = 0;
-	h = 0;
-}
+StreamTexture2D::StreamTexture2D() {}
 
 StreamTexture2D::~StreamTexture2D() {
 	if (texture.is_valid()) {
@@ -1033,13 +1024,7 @@ void StreamTexture3D::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::STRING, "load_path", PROPERTY_HINT_FILE, "*.stex"), "load", "get_load_path");
 }
 
-StreamTexture3D::StreamTexture3D() {
-	format = Image::FORMAT_MAX;
-	w = 0;
-	h = 0;
-	d = 0;
-	mipmaps = false;
-}
+StreamTexture3D::StreamTexture3D() {}
 
 StreamTexture3D::~StreamTexture3D() {
 	if (texture.is_valid()) {
@@ -1295,9 +1280,7 @@ bool AtlasTexture::is_pixel_opaque(int p_x, int p_y) const {
 	return atlas->is_pixel_opaque(x, y);
 }
 
-AtlasTexture::AtlasTexture() {
-	filter_clip = false;
-}
+AtlasTexture::AtlasTexture() {}
 
 /////////////////////////////////////////
 
@@ -1698,9 +1681,7 @@ RID CurveTexture::get_rid() const {
 	return _texture;
 }
 
-CurveTexture::CurveTexture() {
-	_width = 2048;
-}
+CurveTexture::CurveTexture() {}
 
 CurveTexture::~CurveTexture() {
 	if (_texture.is_valid()) {
@@ -1711,9 +1692,6 @@ CurveTexture::~CurveTexture() {
 //////////////////
 
 GradientTexture::GradientTexture() {
-	update_pending = false;
-	width = 2048;
-
 	_queue_update();
 }
 
@@ -2128,13 +2106,6 @@ AnimatedTexture::AnimatedTexture() {
 	proxy = RS::get_singleton()->texture_proxy_create(proxy_ph);
 
 	RenderingServer::get_singleton()->texture_set_force_redraw_if_visible(proxy, true);
-	time = 0;
-	frame_count = 1;
-	fps = 4;
-	prev_ticks = 0;
-	current_frame = 0;
-	pause = false;
-	oneshot = false;
 	RenderingServer::get_singleton()->connect("frame_pre_draw", callable_mp(this, &AnimatedTexture::_update_proxy));
 }
 
@@ -2288,11 +2259,6 @@ void ImageTextureLayered::_bind_methods() {
 
 ImageTextureLayered::ImageTextureLayered(LayeredType p_layered_type) {
 	layered_type = p_layered_type;
-	format = Image::FORMAT_MAX;
-
-	width = 0;
-	height = 0;
-	layers = 0;
 }
 
 ImageTextureLayered::~ImageTextureLayered() {
@@ -2460,11 +2426,6 @@ void StreamTextureLayered::_bind_methods() {
 
 StreamTextureLayered::StreamTextureLayered(LayeredType p_type) {
 	layered_type = p_type;
-	format = Image::FORMAT_MAX;
-	w = 0;
-	h = 0;
-	layers = 0;
-	mipmaps = false;
 }
 
 StreamTextureLayered::~StreamTextureLayered() {
@@ -2626,10 +2587,7 @@ bool CameraTexture::get_camera_active() const {
 	}
 }
 
-CameraTexture::CameraTexture() {
-	camera_feed_id = 0;
-	which_feed = CameraServer::FEED_RGBA_IMAGE;
-}
+CameraTexture::CameraTexture() {}
 
 CameraTexture::~CameraTexture() {
 	// nothing to do here yet
diff --git a/scene/resources/texture.h b/scene/resources/texture.h
index 83ef0c44ae..ce2cf44530 100644
--- a/scene/resources/texture.h
+++ b/scene/resources/texture.h
@@ -83,12 +83,13 @@ class ImageTexture : public Texture2D {
 	RES_BASE_EXTENSION("tex");
 
 	mutable RID texture;
-	Image::Format format;
-	bool mipmaps;
-	int w, h;
+	Image::Format format = Image::FORMAT_L8;
+	bool mipmaps = false;
+	int w = 0;
+	int h = 0;
 	Size2 size_override;
 	mutable Ref<BitMap> alpha_cache;
-	bool image_stored;
+	bool image_stored = false;
 
 protected:
 	virtual void reload_from_file() override;
@@ -160,8 +161,9 @@ private:
 	Error _load_data(const String &p_path, int &tw, int &th, int &tw_custom, int &th_custom, Ref<Image> &image, bool &r_request_3d, bool &r_request_normal, bool &r_request_roughness, int &mipmap_limit, int p_size_limit = 0);
 	String path_to_file;
 	mutable RID texture;
-	Image::Format format;
-	int w, h;
+	Image::Format format = Image::FORMAT_MAX;
+	int w = 0;
+	int h = 0;
 	mutable Ref<BitMap> alpha_cache;
 
 	virtual void reload_from_file() override;
@@ -223,7 +225,7 @@ protected:
 	Ref<Texture2D> atlas;
 	Rect2 region;
 	Rect2 margin;
-	bool filter_clip;
+	bool filter_clip = false;
 
 	static void _bind_methods();
 
@@ -370,12 +372,12 @@ class ImageTextureLayered : public TextureLayered {
 	LayeredType layered_type;
 
 	mutable RID texture;
-	Image::Format format;
+	Image::Format format = Image::FORMAT_MAX;
 
-	int width;
-	int height;
-	int layers;
-	bool mipmaps;
+	int width = 0;
+	int height = 0;
+	int layers = 0;
+	bool mipmaps = false;
 
 	Error _create_from_images(const Array &p_images);
 
@@ -453,10 +455,12 @@ private:
 	Error _load_data(const String &p_path, Vector<Ref<Image>> &images, int &mipmap_limit, int p_size_limit = 0);
 	String path_to_file;
 	mutable RID texture;
-	Image::Format format;
-	int w, h, layers;
-	bool mipmaps;
-	LayeredType layered_type;
+	Image::Format format = Image::FORMAT_MAX;
+	int w = 0;
+	int h = 0;
+	int layers = 0;
+	bool mipmaps = false;
+	LayeredType layered_type = LayeredType::LAYERED_TYPE_2D_ARRAY;
 
 	virtual void reload_from_file() override;
 
@@ -594,9 +598,11 @@ private:
 	Error _load_data(const String &p_path, Vector<Ref<Image>> &r_data, Image::Format &r_format, int &r_width, int &r_height, int &r_depth, bool &r_mipmaps);
 	String path_to_file;
 	mutable RID texture;
-	Image::Format format;
-	int w, h, d;
-	bool mipmaps;
+	Image::Format format = Image::FORMAT_MAX;
+	int w = 0;
+	int h = 0;
+	int d = 0;
+	bool mipmaps = false;
 
 	virtual void reload_from_file() override;
 
@@ -638,7 +644,7 @@ class CurveTexture : public Texture2D {
 private:
 	mutable RID _texture;
 	Ref<Curve> _curve;
-	int _width;
+	int _width = 2048;
 
 	void _update();
 
@@ -680,7 +686,7 @@ class GradientTexture : public Texture2D {
 
 public:
 	struct Point {
-		float offset;
+		float offset = 0.0;
 		Color color;
 		bool operator<(const Point &p_ponit) const {
 			return offset < p_ponit.offset;
@@ -689,9 +695,9 @@ public:
 
 private:
 	Ref<Gradient> gradient;
-	bool update_pending;
+	bool update_pending = false;
 	RID texture;
-	int width;
+	int width = 2048;
 
 	void _queue_update();
 	void _update();
@@ -758,23 +764,19 @@ private:
 
 	struct Frame {
 		Ref<Texture2D> texture;
-		float delay_sec;
-
-		Frame() {
-			delay_sec = 0;
-		}
+		float delay_sec = 0.0;
 	};
 
 	Frame frames[MAX_FRAMES];
-	int frame_count;
-	int current_frame;
-	bool pause;
-	bool oneshot;
-	float fps;
+	int frame_count = 1.0;
+	int current_frame = 0;
+	bool pause = false;
+	bool oneshot = false;
+	float fps = 4.0;
 
-	float time;
+	float time = 0.0;
 
-	uint64_t prev_ticks;
+	uint64_t prev_ticks = 0;
 
 	void _update_proxy();
 
@@ -822,8 +824,8 @@ class CameraTexture : public Texture2D {
 	GDCLASS(CameraTexture, Texture2D);
 
 private:
-	int camera_feed_id;
-	CameraServer::FeedImage which_feed;
+	int camera_feed_id = 0;
+	CameraServer::FeedImage which_feed = CameraServer::FEED_RGBA_IMAGE;
 
 protected:
 	static void _bind_methods();
diff --git a/scene/resources/visual_shader.h b/scene/resources/visual_shader.h
index 9396a53e8b..57732cc7e3 100644
--- a/scene/resources/visual_shader.h
+++ b/scene/resources/visual_shader.h
@@ -57,10 +57,10 @@ public:
 	};
 
 	struct Connection {
-		int from_node;
-		int from_port;
-		int to_node;
-		int to_port;
+		int from_node = 0;
+		int from_port = 0;
+		int to_node = 0;
+		int to_port = 0;
 	};
 
 	struct DefaultTextureParam {
@@ -90,7 +90,7 @@ private:
 	Vector2 graph_offset;
 
 	struct RenderModeEnums {
-		Shader::Mode mode;
+		Shader::Mode mode = Shader::Mode::MODE_MAX;
 		const char *string;
 	};
 
@@ -107,7 +107,7 @@ private:
 			uint64_t node : 32;
 			uint64_t port : 32;
 		};
-		uint64_t key;
+		uint64_t key = 0;
 		bool operator<(const ConnectionKey &p_key) const {
 			return key < p_key.key;
 		}
@@ -265,7 +265,7 @@ class VisualShaderNodeCustom : public VisualShaderNode {
 
 	struct Port {
 		String name;
-		int type;
+		int type = 0;
 	};
 
 	List<Port> input_ports;
@@ -305,9 +305,9 @@ class VisualShaderNodeInput : public VisualShaderNode {
 	Shader::Mode shader_mode = Shader::MODE_MAX;
 
 	struct Port {
-		Shader::Mode mode;
-		VisualShader::Type shader_type;
-		PortType type;
+		Shader::Mode mode = Shader::Mode::MODE_MAX;
+		VisualShader::Type shader_type = VisualShader::Type::TYPE_MAX;
+		PortType type = PortType::PORT_TYPE_MAX;
 		const char *name;
 		const char *string;
 	};
@@ -356,13 +356,13 @@ class VisualShaderNodeOutput : public VisualShaderNode {
 
 public:
 	friend class VisualShader;
-	VisualShader::Type shader_type;
-	Shader::Mode shader_mode;
+	VisualShader::Type shader_type = VisualShader::Type::TYPE_MAX;
+	Shader::Mode shader_mode = Shader::Mode::MODE_MAX;
 
 	struct Port {
-		Shader::Mode mode;
-		VisualShader::Type shader_type;
-		PortType type;
+		Shader::Mode mode = Shader::Mode::MODE_MAX;
+		VisualShader::Type shader_type = VisualShader::Type::TYPE_MAX;
+		PortType type = PortType::PORT_TYPE_MAX;
 		const char *name;
 		const char *string;
 	};
@@ -519,7 +519,7 @@ protected:
 	bool editable = false;
 
 	struct Port {
-		PortType type;
+		PortType type = PortType::PORT_TYPE_MAX;
 		String name;
 	};
 
diff --git a/scene/resources/world_2d.cpp b/scene/resources/world_2d.cpp
index cadbd93fed..156c7d0576 100644
--- a/scene/resources/world_2d.cpp
+++ b/scene/resources/world_2d.cpp
@@ -39,7 +39,7 @@
 
 struct SpatialIndexer2D {
 	struct CellRef {
-		int ref;
+		int ref = 0;
 
 		_FORCE_INLINE_ int inc() {
 			ref++;
@@ -49,10 +49,6 @@ struct SpatialIndexer2D {
 			ref--;
 			return ref;
 		}
-
-		_FORCE_INLINE_ CellRef() {
-			ref = 0;
-		}
 	};
 
 	struct CellKey {
@@ -61,7 +57,7 @@ struct SpatialIndexer2D {
 				int32_t x;
 				int32_t y;
 			};
-			uint64_t key;
+			uint64_t key = 0;
 		};
 
 		bool operator==(const CellKey &p_key) const { return key == p_key.key; }
@@ -86,9 +82,9 @@ struct SpatialIndexer2D {
 
 	Map<Viewport *, ViewportData> viewports;
 
-	bool changed;
+	bool changed = false;
 
-	uint64_t pass;
+	uint64_t pass = 0;
 
 	void _notifier_update_cells(VisibilityNotifier2D *p_notifier, const Rect2 &p_rect, bool p_add) {
 		Point2i begin = p_rect.position;
@@ -287,8 +283,6 @@ struct SpatialIndexer2D {
 	}
 
 	SpatialIndexer2D() {
-		pass = 0;
-		changed = false;
 		cell_size = GLOBAL_DEF("world/2d/cell_size", 100);
 	}
 };