19 files changed, 797 insertions, 304 deletions

diff --git a/scene/resources/audio_stream_sample.cpp b/scene/resources/audio_stream_sample.cpp
index 06a91fb2f8..9a9f019dda 100644
--- a/scene/resources/audio_stream_sample.cpp
+++ b/scene/resources/audio_stream_sample.cpp
@@ -490,9 +490,9 @@ void AudioStreamSample::set_data(const Vector<uint8_t> &p_data) {
 		const uint8_t *r = p_data.ptr();
 		int alloc_len = datalen + DATA_PAD * 2;
 		data = memalloc(alloc_len); //alloc with some padding for interpolation
-		zeromem(data, alloc_len);
+		memset(data, 0, alloc_len);
 		uint8_t *dataptr = (uint8_t *)data;
-		copymem(dataptr + DATA_PAD, r, datalen);
+		memcpy(dataptr + DATA_PAD, r, datalen);
 		data_bytes = datalen;
 	}
 
@@ -507,7 +507,7 @@ Vector<uint8_t> AudioStreamSample::get_data() const {
 		{
 			uint8_t *w = pv.ptrw();
 			uint8_t *dataptr = (uint8_t *)data;
-			copymem(w, dataptr + DATA_PAD, data_bytes);
+			memcpy(w, dataptr + DATA_PAD, data_bytes);
 		}
 	}
 
diff --git a/scene/resources/bit_map.cpp b/scene/resources/bit_map.cpp
index 3cc1af59ae..e9bfac3653 100644
--- a/scene/resources/bit_map.cpp
+++ b/scene/resources/bit_map.cpp
@@ -39,7 +39,7 @@ void BitMap::create(const Size2 &p_size) {
 	width = p_size.width;
 	height = p_size.height;
 	bitmask.resize(((width * height) / 8) + 1);
-	zeromem(bitmask.ptrw(), bitmask.size());
+	memset(bitmask.ptrw(), 0, bitmask.size());
 }
 
 void BitMap::create_from_image_alpha(const Ref<Image> &p_image, float p_threshold) {
diff --git a/scene/resources/curve.cpp b/scene/resources/curve.cpp
index bc479e557a..846da39221 100644
--- a/scene/resources/curve.cpp
+++ b/scene/resources/curve.cpp
@@ -445,10 +445,10 @@ void Curve::set_bake_resolution(int p_resolution) {
 	_baked_cache_dirty = true;
 }
 
-real_t Curve::interpolate_baked(real_t offset) {
+real_t Curve::interpolate_baked(real_t offset) const {
 	if (_baked_cache_dirty) {
 		// Last-second bake if not done already
-		bake();
+		const_cast<Curve *>(this)->bake();
 	}
 
 	// Special cases if the cache is too small
diff --git a/scene/resources/curve.h b/scene/resources/curve.h
index 402c893cd8..746c6fa597 100644
--- a/scene/resources/curve.h
+++ b/scene/resources/curve.h
@@ -122,7 +122,7 @@ public:
 	void bake();
 	int get_bake_resolution() const { return _bake_resolution; }
 	void set_bake_resolution(int p_resolution);
-	real_t interpolate_baked(real_t offset);
+	real_t interpolate_baked(real_t offset) const;
 
 	void ensure_default_setup(float p_min, float p_max);
 
diff --git a/scene/resources/default_theme/default_theme.cpp b/scene/resources/default_theme/default_theme.cpp
index b9f4a7a741..7c00c6d146 100644
--- a/scene/resources/default_theme/default_theme.cpp
+++ b/scene/resources/default_theme/default_theme.cpp
@@ -830,7 +830,6 @@ void fill_default_theme(Ref<Theme> &theme, const Ref<Font> &default_font, const
 	theme->set_stylebox("tab_selected", "Tabs", sb_expand(make_stylebox(tab_current_png, 4, 3, 4, 1, 16, 3, 16, 2), 2, 2, 2, 2));
 	theme->set_stylebox("tab_unselected", "Tabs", sb_expand(make_stylebox(tab_behind_png, 5, 4, 5, 1, 16, 5, 16, 2), 3, 3, 3, 3));
 	theme->set_stylebox("tab_disabled", "Tabs", sb_expand(make_stylebox(tab_disabled_png, 5, 5, 5, 1, 16, 6, 16, 4), 3, 0, 3, 3));
-	theme->set_stylebox("panel", "Tabs", tc_sb);
 	theme->set_stylebox("button_pressed", "Tabs", make_stylebox(button_pressed_png, 4, 4, 4, 4));
 	theme->set_stylebox("button", "Tabs", make_stylebox(button_normal_png, 4, 4, 4, 4));
 
diff --git a/scene/resources/material.cpp b/scene/resources/material.cpp
index d5a018ef41..e8157c7165 100644
--- a/scene/resources/material.cpp
+++ b/scene/resources/material.cpp
@@ -543,6 +543,9 @@ void BaseMaterial3D::_update_shader() {
 	if (flags[FLAG_DISABLE_DEPTH_TEST]) {
 		code += ",depth_test_disabled";
 	}
+	if (flags[FLAG_PARTICLE_TRAILS_MODE]) {
+		code += ",particle_trails";
+	}
 	if (shading_mode == SHADING_MODE_PER_VERTEX) {
 		code += ",vertex_lighting";
 	}
@@ -1597,6 +1600,9 @@ void BaseMaterial3D::set_flag(Flags p_flag, bool p_enabled) {
 	if (p_flag == FLAG_USE_SHADOW_TO_OPACITY || p_flag == FLAG_USE_TEXTURE_REPEAT || p_flag == FLAG_SUBSURFACE_MODE_SKIN || p_flag == FLAG_USE_POINT_SIZE) {
 		notify_property_list_changed();
 	}
+	if (p_flag == FLAG_PARTICLE_TRAILS_MODE) {
+		update_configuration_warning();
+	}
 	_queue_shader_change();
 }
 
@@ -2177,6 +2183,8 @@ Shader::Mode BaseMaterial3D::get_shader_mode() const {
 }
 
 void BaseMaterial3D::_bind_methods() {
+	static_assert(sizeof(MaterialKey) == 16, "MaterialKey should be 16 bytes");
+
 	ClassDB::bind_method(D_METHOD("set_albedo", "albedo"), &BaseMaterial3D::set_albedo);
 	ClassDB::bind_method(D_METHOD("get_albedo"), &BaseMaterial3D::get_albedo);
 
@@ -2534,6 +2542,7 @@ void BaseMaterial3D::_bind_methods() {
 	ADD_PROPERTYI(PropertyInfo(Variant::BOOL, "fixed_size"), "set_flag", "get_flag", FLAG_FIXED_SIZE);
 	ADD_PROPERTYI(PropertyInfo(Variant::BOOL, "use_point_size"), "set_flag", "get_flag", FLAG_USE_POINT_SIZE);
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "point_size", PROPERTY_HINT_RANGE, "0.1,128,0.1"), "set_point_size", "get_point_size");
+	ADD_PROPERTYI(PropertyInfo(Variant::BOOL, "use_particle_trails"), "set_flag", "get_flag", FLAG_PARTICLE_TRAILS_MODE);
 	ADD_GROUP("Proximity Fade", "proximity_fade_");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "proximity_fade_enable"), "set_proximity_fade", "is_proximity_fade_enabled");
 	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "proximity_fade_distance", PROPERTY_HINT_RANGE, "0,4096,0.01"), "set_proximity_fade_distance", "get_proximity_fade_distance");
@@ -2635,6 +2644,7 @@ void BaseMaterial3D::_bind_methods() {
 	BIND_ENUM_CONSTANT(FLAG_USE_TEXTURE_REPEAT);
 	BIND_ENUM_CONSTANT(FLAG_INVERT_HEIGHTMAP);
 	BIND_ENUM_CONSTANT(FLAG_SUBSURFACE_MODE_SKIN);
+	BIND_ENUM_CONSTANT(FLAG_PARTICLE_TRAILS_MODE);
 	BIND_ENUM_CONSTANT(FLAG_MAX);
 
 	BIND_ENUM_CONSTANT(DIFFUSE_BURLEY);
diff --git a/scene/resources/material.h b/scene/resources/material.h
index 70452a5f74..ad1b7b3e33 100644
--- a/scene/resources/material.h
+++ b/scene/resources/material.h
@@ -235,6 +235,7 @@ public:
 		FLAG_USE_TEXTURE_REPEAT,
 		FLAG_INVERT_HEIGHTMAP,
 		FLAG_SUBSURFACE_MODE_SKIN,
+		FLAG_PARTICLE_TRAILS_MODE,
 		FLAG_MAX
 	};
 
@@ -305,16 +306,15 @@ private:
 		uint64_t roughness_channel : get_num_bits(TEXTURE_CHANNEL_MAX - 1);
 		uint64_t emission_op : get_num_bits(EMISSION_OP_MAX - 1);
 		uint64_t distance_fade : get_num_bits(DISTANCE_FADE_MAX - 1);
-
-		// flag bitfield
-		uint64_t feature_mask : FEATURE_MAX - 1;
-		uint64_t flags : FLAG_MAX - 1;
-
 		// booleans
 		uint64_t deep_parallax : 1;
 		uint64_t grow : 1;
 		uint64_t proximity_fade : 1;
 
+		// flag bitfield
+		uint32_t feature_mask;
+		uint32_t flags;
+
 		MaterialKey() {
 			memset(this, 0, sizeof(MaterialKey));
 		}
diff --git a/scene/resources/mesh.cpp b/scene/resources/mesh.cpp
index f8e1ce6a61..33ad15b938 100644
--- a/scene/resources/mesh.cpp
+++ b/scene/resources/mesh.cpp
@@ -579,6 +579,13 @@ Vector<Ref<Shape3D>> Mesh::convex_decompose() const {
 	return ret;
 }
 
+int Mesh::get_builtin_bind_pose_count() const {
+	return 0;
+}
+Transform Mesh::get_builtin_bind_pose(int p_index) const {
+	return Transform();
+}
+
 Mesh::Mesh() {
 }
 
@@ -1394,7 +1401,7 @@ void ArrayMesh::regen_normal_maps() {
 }
 
 //dirty hack
-bool (*array_mesh_lightmap_unwrap_callback)(float p_texel_size, const float *p_vertices, const float *p_normals, int p_vertex_count, const int *p_indices, int p_index_count, float **r_uv, int **r_vertex, int *r_vertex_count, int **r_index, int *r_index_count, int *r_size_hint_x, int *r_size_hint_y, int *&r_cache_data, unsigned int &r_cache_size, bool &r_used_cache);
+bool (*array_mesh_lightmap_unwrap_callback)(float p_texel_size, const float *p_vertices, const float *p_normals, int p_vertex_count, const int *p_indices, int p_index_count, const uint8_t *p_cache_data, bool *r_use_cache, uint8_t **r_mesh_cache, int *r_mesh_cache_size, float **r_uv, int **r_vertex, int *r_vertex_count, int **r_index, int *r_index_count, int *r_size_hint_x, int *r_size_hint_y) = NULL;
 
 struct ArrayMeshLightmapSurface {
 	Ref<Material> material;
@@ -1404,28 +1411,28 @@ struct ArrayMeshLightmapSurface {
 };
 
 Error ArrayMesh::lightmap_unwrap(const Transform &p_base_transform, float p_texel_size) {
-	int *cache_data = nullptr;
-	unsigned int cache_size = 0;
-	bool use_cache = false; // Don't use cache
-	return lightmap_unwrap_cached(cache_data, cache_size, use_cache, p_base_transform, p_texel_size);
+	Vector<uint8_t> null_cache;
+	return lightmap_unwrap_cached(p_base_transform, p_texel_size, null_cache, null_cache, false);
 }
 
-Error ArrayMesh::lightmap_unwrap_cached(int *&r_cache_data, unsigned int &r_cache_size, bool &r_used_cache, const Transform &p_base_transform, float p_texel_size) {
+Error ArrayMesh::lightmap_unwrap_cached(const Transform &p_base_transform, float p_texel_size, const Vector<uint8_t> &p_src_cache, Vector<uint8_t> &r_dst_cache, bool p_generate_cache) {
 	ERR_FAIL_COND_V(!array_mesh_lightmap_unwrap_callback, ERR_UNCONFIGURED);
 	ERR_FAIL_COND_V_MSG(blend_shapes.size() != 0, ERR_UNAVAILABLE, "Can't unwrap mesh with blend shapes.");
 
-	Vector<float> vertices;
-	Vector<float> normals;
-	Vector<int> indices;
-	Vector<float> uv;
-	Vector<Pair<int, int>> uv_indices;
+	LocalVector<float> vertices;
+	LocalVector<float> normals;
+	LocalVector<int> indices;
+	LocalVector<float> uv;
+	LocalVector<Pair<int, int>> uv_indices;
 
 	Vector<ArrayMeshLightmapSurface> lightmap_surfaces;
 
 	// Keep only the scale
-	Transform transform = p_base_transform;
-	transform.origin = Vector3();
-	transform.looking_at(Vector3(1, 0, 0), Vector3(0, 1, 0));
+	Basis basis = p_base_transform.get_basis();
+	Vector3 scale = Vector3(basis.get_axis(0).length(), basis.get_axis(1).length(), basis.get_axis(2).length());
+
+	Transform transform;
+	transform.scale(scale);
 
 	Basis normal_basis = transform.basis.inverse().transposed();
 
@@ -1439,14 +1446,12 @@ Error ArrayMesh::lightmap_unwrap_cached(int *&r_cache_data, unsigned int &r_cach
 
 		Array arrays = surface_get_arrays(i);
 		s.material = surface_get_material(i);
-		SurfaceTool::create_vertex_array_from_triangle_arrays(arrays, s.vertices);
+		SurfaceTool::create_vertex_array_from_triangle_arrays(arrays, s.vertices, &s.format);
 
-		Vector<Vector3> rvertices = arrays[Mesh::ARRAY_VERTEX];
+		PackedVector3Array rvertices = arrays[Mesh::ARRAY_VERTEX];
 		int vc = rvertices.size();
-		const Vector3 *r = rvertices.ptr();
 
-		Vector<Vector3> rnormals = arrays[Mesh::ARRAY_NORMAL];
-		const Vector3 *rn = rnormals.ptr();
+		PackedVector3Array rnormals = arrays[Mesh::ARRAY_NORMAL];
 
 		int vertex_ofs = vertices.size() / 3;
 
@@ -1455,24 +1460,29 @@ Error ArrayMesh::lightmap_unwrap_cached(int *&r_cache_data, unsigned int &r_cach
 		uv_indices.resize(vertex_ofs + vc);
 
 		for (int j = 0; j < vc; j++) {
-			Vector3 v = transform.xform(r[j]);
-			Vector3 n = normal_basis.xform(rn[j]).normalized();
-
-			vertices.write[(j + vertex_ofs) * 3 + 0] = v.x;
-			vertices.write[(j + vertex_ofs) * 3 + 1] = v.y;
-			vertices.write[(j + vertex_ofs) * 3 + 2] = v.z;
-			normals.write[(j + vertex_ofs) * 3 + 0] = n.x;
-			normals.write[(j + vertex_ofs) * 3 + 1] = n.y;
-			normals.write[(j + vertex_ofs) * 3 + 2] = n.z;
-			uv_indices.write[j + vertex_ofs] = Pair<int, int>(i, j);
+			Vector3 v = transform.xform(rvertices[j]);
+			Vector3 n = normal_basis.xform(rnormals[j]).normalized();
+
+			vertices[(j + vertex_ofs) * 3 + 0] = v.x;
+			vertices[(j + vertex_ofs) * 3 + 1] = v.y;
+			vertices[(j + vertex_ofs) * 3 + 2] = v.z;
+			normals[(j + vertex_ofs) * 3 + 0] = n.x;
+			normals[(j + vertex_ofs) * 3 + 1] = n.y;
+			normals[(j + vertex_ofs) * 3 + 2] = n.z;
+			uv_indices[j + vertex_ofs] = Pair<int, int>(i, j);
 		}
 
-		Vector<int> rindices = arrays[Mesh::ARRAY_INDEX];
+		PackedInt32Array rindices = arrays[Mesh::ARRAY_INDEX];
 		int ic = rindices.size();
 
+		float eps = 1.19209290e-7F; // Taken from xatlas.h
 		if (ic == 0) {
 			for (int j = 0; j < vc / 3; j++) {
-				if (Face3(r[j * 3 + 0], r[j * 3 + 1], r[j * 3 + 2]).is_degenerate()) {
+				Vector3 p0 = transform.xform(rvertices[j * 3 + 0]);
+				Vector3 p1 = transform.xform(rvertices[j * 3 + 1]);
+				Vector3 p2 = transform.xform(rvertices[j * 3 + 2]);
+
+				if ((p0 - p1).length_squared() < eps || (p1 - p2).length_squared() < eps || (p2 - p0).length_squared() < eps) {
 					continue;
 				}
 
@@ -1482,15 +1492,18 @@ Error ArrayMesh::lightmap_unwrap_cached(int *&r_cache_data, unsigned int &r_cach
 			}
 
 		} else {
-			const int *ri = rindices.ptr();
-
 			for (int j = 0; j < ic / 3; j++) {
-				if (Face3(r[ri[j * 3 + 0]], r[ri[j * 3 + 1]], r[ri[j * 3 + 2]]).is_degenerate()) {
+				Vector3 p0 = transform.xform(rvertices[rindices[j * 3 + 0]]);
+				Vector3 p1 = transform.xform(rvertices[rindices[j * 3 + 1]]);
+				Vector3 p2 = transform.xform(rvertices[rindices[j * 3 + 2]]);
+
+				if ((p0 - p1).length_squared() < eps || (p1 - p2).length_squared() < eps || (p2 - p0).length_squared() < eps) {
 					continue;
 				}
-				indices.push_back(vertex_ofs + ri[j * 3 + 0]);
-				indices.push_back(vertex_ofs + ri[j * 3 + 1]);
-				indices.push_back(vertex_ofs + ri[j * 3 + 2]);
+
+				indices.push_back(vertex_ofs + rindices[j * 3 + 0]);
+				indices.push_back(vertex_ofs + rindices[j * 3 + 1]);
+				indices.push_back(vertex_ofs + rindices[j * 3 + 2]);
 			}
 		}
 
@@ -1499,6 +1512,9 @@ Error ArrayMesh::lightmap_unwrap_cached(int *&r_cache_data, unsigned int &r_cach
 
 	//unwrap
 
+	bool use_cache = p_generate_cache; // Used to request cache generation and to know if cache was used
+	uint8_t *gen_cache;
+	int gen_cache_size;
 	float *gen_uvs;
 	int *gen_vertices;
 	int *gen_indices;
@@ -1507,17 +1523,16 @@ Error ArrayMesh::lightmap_unwrap_cached(int *&r_cache_data, unsigned int &r_cach
 	int size_x;
 	int size_y;
 
-	bool ok = array_mesh_lightmap_unwrap_callback(p_texel_size, vertices.ptr(), normals.ptr(), vertices.size() / 3, indices.ptr(), indices.size(), &gen_uvs, &gen_vertices, &gen_vertex_count, &gen_indices, &gen_index_count, &size_x, &size_y, r_cache_data, r_cache_size, r_used_cache);
+	bool ok = array_mesh_lightmap_unwrap_callback(p_texel_size, vertices.ptr(), normals.ptr(), vertices.size() / 3, indices.ptr(), indices.size(), p_src_cache.ptr(), &use_cache, &gen_cache, &gen_cache_size, &gen_uvs, &gen_vertices, &gen_vertex_count, &gen_indices, &gen_index_count, &size_x, &size_y);
 
 	if (!ok) {
 		return ERR_CANT_CREATE;
 	}
 
-	//remove surfaces
 	clear_surfaces();
 
 	//create surfacetools for each surface..
-	Vector<Ref<SurfaceTool>> surfaces_tools;
+	LocalVector<Ref<SurfaceTool>> surfaces_tools;
 
 	for (int i = 0; i < lightmap_surfaces.size(); i++) {
 		Ref<SurfaceTool> st;
@@ -1528,11 +1543,12 @@ Error ArrayMesh::lightmap_unwrap_cached(int *&r_cache_data, unsigned int &r_cach
 	}
 
 	print_verbose("Mesh: Gen indices: " + itos(gen_index_count));
+
 	//go through all indices
 	for (int i = 0; i < gen_index_count; i += 3) {
-		ERR_FAIL_INDEX_V(gen_vertices[gen_indices[i + 0]], uv_indices.size(), ERR_BUG);
-		ERR_FAIL_INDEX_V(gen_vertices[gen_indices[i + 1]], uv_indices.size(), ERR_BUG);
-		ERR_FAIL_INDEX_V(gen_vertices[gen_indices[i + 2]], uv_indices.size(), ERR_BUG);
+		ERR_FAIL_INDEX_V(gen_vertices[gen_indices[i + 0]], (int)uv_indices.size(), ERR_BUG);
+		ERR_FAIL_INDEX_V(gen_vertices[gen_indices[i + 1]], (int)uv_indices.size(), ERR_BUG);
+		ERR_FAIL_INDEX_V(gen_vertices[gen_indices[i + 2]], (int)uv_indices.size(), ERR_BUG);
 
 		ERR_FAIL_COND_V(uv_indices[gen_vertices[gen_indices[i + 0]]].first != uv_indices[gen_vertices[gen_indices[i + 1]]].first || uv_indices[gen_vertices[gen_indices[i + 0]]].first != uv_indices[gen_vertices[gen_indices[i + 2]]].first, ERR_BUG);
 
@@ -1542,48 +1558,53 @@ Error ArrayMesh::lightmap_unwrap_cached(int *&r_cache_data, unsigned int &r_cach
 			SurfaceTool::Vertex v = lightmap_surfaces[surface].vertices[uv_indices[gen_vertices[gen_indices[i + j]]].second];
 
 			if (lightmap_surfaces[surface].format & ARRAY_FORMAT_COLOR) {
-				surfaces_tools.write[surface]->set_color(v.color);
+				surfaces_tools[surface]->set_color(v.color);
 			}
 			if (lightmap_surfaces[surface].format & ARRAY_FORMAT_TEX_UV) {
-				surfaces_tools.write[surface]->set_uv(v.uv);
+				surfaces_tools[surface]->set_uv(v.uv);
 			}
 			if (lightmap_surfaces[surface].format & ARRAY_FORMAT_NORMAL) {
-				surfaces_tools.write[surface]->set_normal(v.normal);
+				surfaces_tools[surface]->set_normal(v.normal);
 			}
 			if (lightmap_surfaces[surface].format & ARRAY_FORMAT_TANGENT) {
 				Plane t;
 				t.normal = v.tangent;
 				t.d = v.binormal.dot(v.normal.cross(v.tangent)) < 0 ? -1 : 1;
-				surfaces_tools.write[surface]->set_tangent(t);
+				surfaces_tools[surface]->set_tangent(t);
 			}
 			if (lightmap_surfaces[surface].format & ARRAY_FORMAT_BONES) {
-				surfaces_tools.write[surface]->set_bones(v.bones);
+				surfaces_tools[surface]->set_bones(v.bones);
 			}
 			if (lightmap_surfaces[surface].format & ARRAY_FORMAT_WEIGHTS) {
-				surfaces_tools.write[surface]->set_weights(v.weights);
+				surfaces_tools[surface]->set_weights(v.weights);
 			}
 
 			Vector2 uv2(gen_uvs[gen_indices[i + j] * 2 + 0], gen_uvs[gen_indices[i + j] * 2 + 1]);
-			surfaces_tools.write[surface]->set_uv2(uv2);
+			surfaces_tools[surface]->set_uv2(uv2);
 
-			surfaces_tools.write[surface]->add_vertex(v.vertex);
+			surfaces_tools[surface]->add_vertex(v.vertex);
 		}
 	}
 
 	//generate surfaces
-
-	for (int i = 0; i < surfaces_tools.size(); i++) {
-		surfaces_tools.write[i]->index();
-		surfaces_tools.write[i]->commit(Ref<ArrayMesh>((ArrayMesh *)this), lightmap_surfaces[i].format);
+	for (unsigned int i = 0; i < surfaces_tools.size(); i++) {
+		surfaces_tools[i]->index();
+		surfaces_tools[i]->commit(Ref<ArrayMesh>((ArrayMesh *)this), lightmap_surfaces[i].format);
 	}
 
 	set_lightmap_size_hint(Size2(size_x, size_y));
 
-	if (!r_used_cache) {
-		//free stuff
-		::free(gen_vertices);
-		::free(gen_indices);
-		::free(gen_uvs);
+	if (gen_cache_size > 0) {
+		r_dst_cache.resize(gen_cache_size);
+		memcpy(r_dst_cache.ptrw(), gen_cache, gen_cache_size);
+		memfree(gen_cache);
+	}
+
+	if (!use_cache) {
+		// Cache was not used, free the buffers
+		memfree(gen_vertices);
+		memfree(gen_indices);
+		memfree(gen_uvs);
 	}
 
 	return OK;
diff --git a/scene/resources/mesh.h b/scene/resources/mesh.h
index 9a462d5719..aa830d7b50 100644
--- a/scene/resources/mesh.h
+++ b/scene/resources/mesh.h
@@ -165,6 +165,9 @@ public:
 
 	Vector<Ref<Shape3D>> convex_decompose() const;
 
+	virtual int get_builtin_bind_pose_count() const;
+	virtual Transform get_builtin_bind_pose(int p_index) const;
+
 	Mesh();
 };
 
@@ -260,7 +263,7 @@ public:
 	void regen_normal_maps();
 
 	Error lightmap_unwrap(const Transform &p_base_transform = Transform(), float p_texel_size = 0.05);
-	Error lightmap_unwrap_cached(int *&r_cache_data, unsigned int &r_cache_size, bool &r_used_cache, const Transform &p_base_transform = Transform(), float p_texel_size = 0.05);
+	Error lightmap_unwrap_cached(const Transform &p_base_transform, float p_texel_size, const Vector<uint8_t> &p_src_cache, Vector<uint8_t> &r_dst_cache, bool p_generate_cache = true);
 
 	virtual void reload_from_file() override;
 
diff --git a/scene/resources/navigation_mesh.cpp b/scene/resources/navigation_mesh.cpp
index 8c12f59a00..0a25bb2ed1 100644
--- a/scene/resources/navigation_mesh.cpp
+++ b/scene/resources/navigation_mesh.cpp
@@ -92,6 +92,7 @@ uint32_t NavigationMesh::get_collision_mask() const {
 }
 
 void NavigationMesh::set_collision_mask_bit(int p_bit, bool p_value) {
+	ERR_FAIL_INDEX_MSG(p_bit, 32, "Collision mask bit must be between 0 and 31 inclusive.");
 	uint32_t mask = get_collision_mask();
 	if (p_value) {
 		mask |= 1 << p_bit;
@@ -102,6 +103,7 @@ void NavigationMesh::set_collision_mask_bit(int p_bit, bool p_value) {
 }
 
 bool NavigationMesh::get_collision_mask_bit(int p_bit) const {
+	ERR_FAIL_INDEX_V_MSG(p_bit, 32, false, "Collision mask bit must be between 0 and 31 inclusive.");
 	return get_collision_mask() & (1 << p_bit);
 }
 
diff --git a/scene/resources/particles_material.cpp b/scene/resources/particles_material.cpp
index bb47eebe9b..59e699326d 100644
--- a/scene/resources/particles_material.cpp
+++ b/scene/resources/particles_material.cpp
@@ -615,7 +615,7 @@ void ParticlesMaterial::_update_shader() {
 		}
 		// turn particle by rotation in Y
 		if (particle_flags[PARTICLE_FLAG_ROTATE_Y]) {
-			code += "	TRANSFORM = TRANSFORM * mat4(vec4(cos(CUSTOM.x), 0.0, -sin(CUSTOM.x), 0.0), vec4(0.0, 1.0, 0.0, 0.0), vec4(sin(CUSTOM.x), 0.0, cos(CUSTOM.x), 0.0), vec4(0.0, 0.0, 0.0, 1.0));\n";
+			code += "	TRANSFORM = mat4(vec4(cos(CUSTOM.x), 0.0, -sin(CUSTOM.x), 0.0), vec4(0.0, 1.0, 0.0, 0.0), vec4(sin(CUSTOM.x), 0.0, cos(CUSTOM.x), 0.0), vec4(0.0, 0.0, 0.0, 1.0));\n";
 		}
 	}
 	//scale by scale
diff --git a/scene/resources/primitive_meshes.cpp b/scene/resources/primitive_meshes.cpp
index 1be511e8f1..c3d84aeda2 100644
--- a/scene/resources/primitive_meshes.cpp
+++ b/scene/resources/primitive_meshes.cpp
@@ -1538,3 +1538,552 @@ void PointMesh::_create_mesh_array(Array &p_arr) const {
 PointMesh::PointMesh() {
 	primitive_type = PRIMITIVE_POINTS;
 }
+// TUBE TRAIL
+
+void TubeTrailMesh::set_radius(const float p_radius) {
+	radius = p_radius;
+	_request_update();
+}
+float TubeTrailMesh::get_radius() const {
+	return radius;
+}
+
+void TubeTrailMesh::set_radial_steps(const int p_radial_steps) {
+	ERR_FAIL_COND(p_radial_steps < 3 || p_radial_steps > 128);
+	radial_steps = p_radial_steps;
+	_request_update();
+}
+int TubeTrailMesh::get_radial_steps() const {
+	return radial_steps;
+}
+
+void TubeTrailMesh::set_sections(const int p_sections) {
+	ERR_FAIL_COND(p_sections < 2 || p_sections > 128);
+	sections = p_sections;
+	_request_update();
+}
+int TubeTrailMesh::get_sections() const {
+	return sections;
+}
+
+void TubeTrailMesh::set_section_length(float p_section_length) {
+	section_length = p_section_length;
+	_request_update();
+}
+float TubeTrailMesh::get_section_length() const {
+	return section_length;
+}
+
+void TubeTrailMesh::set_section_rings(const int p_section_rings) {
+	ERR_FAIL_COND(p_section_rings < 1 || p_section_rings > 1024);
+	section_rings = p_section_rings;
+	_request_update();
+}
+int TubeTrailMesh::get_section_rings() const {
+	return section_rings;
+}
+
+void TubeTrailMesh::set_curve(const Ref<Curve> &p_curve) {
+	if (curve == p_curve) {
+		return;
+	}
+	if (curve.is_valid()) {
+		curve->disconnect("changed", callable_mp(this, &TubeTrailMesh::_curve_changed));
+	}
+	curve = p_curve;
+	if (curve.is_valid()) {
+		curve->connect("changed", callable_mp(this, &TubeTrailMesh::_curve_changed));
+	}
+	_request_update();
+}
+Ref<Curve> TubeTrailMesh::get_curve() const {
+	return curve;
+}
+
+void TubeTrailMesh::_curve_changed() {
+	_request_update();
+}
+int TubeTrailMesh::get_builtin_bind_pose_count() const {
+	return sections + 1;
+}
+
+Transform TubeTrailMesh::get_builtin_bind_pose(int p_index) const {
+	float depth = section_length * sections;
+
+	Transform xform;
+	xform.origin.y = depth / 2.0 - section_length * float(p_index);
+	xform.origin.y = -xform.origin.y; //bind is an inverse transform, so negate y
+
+	return xform;
+}
+
+void TubeTrailMesh::_create_mesh_array(Array &p_arr) const {
+	PackedVector3Array points;
+	PackedVector3Array normals;
+	PackedFloat32Array tangents;
+	PackedVector2Array uvs;
+	PackedInt32Array bone_indices;
+	PackedFloat32Array bone_weights;
+	PackedInt32Array indices;
+
+	int point = 0;
+
+#define ADD_TANGENT(m_x, m_y, m_z, m_d) \
+	tangents.push_back(m_x);            \
+	tangents.push_back(m_y);            \
+	tangents.push_back(m_z);            \
+	tangents.push_back(m_d);
+
+	int thisrow = 0;
+	int prevrow = 0;
+
+	int total_rings = section_rings * sections;
+	float depth = section_length * sections;
+
+	for (int j = 0; j <= total_rings; j++) {
+		float v = j;
+		v /= total_rings;
+
+		float y = depth * v;
+		y = (depth * 0.5) - y;
+
+		int bone = j / section_rings;
+		float blend = 1.0 - float(j % section_rings) / float(section_rings);
+
+		for (int i = 0; i <= radial_steps; i++) {
+			float u = i;
+			u /= radial_steps;
+
+			float r = radius;
+			if (curve.is_valid() && curve->get_point_count() > 0) {
+				r *= curve->interpolate_baked(v);
+			}
+			float x = sin(u * Math_TAU);
+			float z = cos(u * Math_TAU);
+
+			Vector3 p = Vector3(x * r, y, z * r);
+			points.push_back(p);
+			normals.push_back(Vector3(x, 0, z));
+			ADD_TANGENT(z, 0.0, -x, 1.0)
+			uvs.push_back(Vector2(u, v * 0.5));
+			point++;
+			{
+				bone_indices.push_back(bone);
+				bone_indices.push_back(MIN(sections, bone + 1));
+				bone_indices.push_back(0);
+				bone_indices.push_back(0);
+
+				bone_weights.push_back(blend);
+				bone_weights.push_back(1.0 - blend);
+				bone_weights.push_back(0);
+				bone_weights.push_back(0);
+			}
+
+			if (i > 0 && j > 0) {
+				indices.push_back(prevrow + i - 1);
+				indices.push_back(prevrow + i);
+				indices.push_back(thisrow + i - 1);
+
+				indices.push_back(prevrow + i);
+				indices.push_back(thisrow + i);
+				indices.push_back(thisrow + i - 1);
+			}
+		}
+
+		prevrow = thisrow;
+		thisrow = point;
+	}
+
+	// add top
+	float scale_pos = 1.0;
+	if (curve.is_valid() && curve->get_point_count() > 0) {
+		scale_pos = curve->interpolate_baked(0);
+	}
+
+	if (scale_pos > CMP_EPSILON) {
+		float y = depth * 0.5;
+
+		thisrow = point;
+		points.push_back(Vector3(0.0, y, 0));
+		normals.push_back(Vector3(0.0, 1.0, 0.0));
+		ADD_TANGENT(1.0, 0.0, 0.0, 1.0)
+		uvs.push_back(Vector2(0.25, 0.75));
+		point++;
+
+		bone_indices.push_back(0);
+		bone_indices.push_back(0);
+		bone_indices.push_back(0);
+		bone_indices.push_back(0);
+
+		bone_weights.push_back(1.0);
+		bone_weights.push_back(0);
+		bone_weights.push_back(0);
+		bone_weights.push_back(0);
+
+		float rm = radius * scale_pos;
+
+		for (int i = 0; i <= radial_steps; i++) {
+			float r = i;
+			r /= radial_steps;
+
+			float x = sin(r * Math_TAU);
+			float z = cos(r * Math_TAU);
+
+			float u = ((x + 1.0) * 0.25);
+			float v = 0.5 + ((z + 1.0) * 0.25);
+
+			Vector3 p = Vector3(x * rm, y, z * rm);
+			points.push_back(p);
+			normals.push_back(Vector3(0.0, 1.0, 0.0));
+			ADD_TANGENT(1.0, 0.0, 0.0, 1.0)
+			uvs.push_back(Vector2(u, v));
+			point++;
+
+			bone_indices.push_back(0);
+			bone_indices.push_back(0);
+			bone_indices.push_back(0);
+			bone_indices.push_back(0);
+
+			bone_weights.push_back(1.0);
+			bone_weights.push_back(0);
+			bone_weights.push_back(0);
+			bone_weights.push_back(0);
+
+			if (i > 0) {
+				indices.push_back(thisrow);
+				indices.push_back(point - 1);
+				indices.push_back(point - 2);
+			};
+		};
+	};
+
+	float scale_neg = 1.0;
+	if (curve.is_valid() && curve->get_point_count() > 0) {
+		scale_neg = curve->interpolate_baked(1.0);
+	}
+
+	// add bottom
+	if (scale_neg > CMP_EPSILON) {
+		float y = depth * -0.5;
+
+		thisrow = point;
+		points.push_back(Vector3(0.0, y, 0.0));
+		normals.push_back(Vector3(0.0, -1.0, 0.0));
+		ADD_TANGENT(1.0, 0.0, 0.0, 1.0)
+		uvs.push_back(Vector2(0.75, 0.75));
+		point++;
+
+		bone_indices.push_back(sections);
+		bone_indices.push_back(0);
+		bone_indices.push_back(0);
+		bone_indices.push_back(0);
+
+		bone_weights.push_back(1.0);
+		bone_weights.push_back(0);
+		bone_weights.push_back(0);
+		bone_weights.push_back(0);
+
+		float rm = radius * scale_neg;
+
+		for (int i = 0; i <= radial_steps; i++) {
+			float r = i;
+			r /= radial_steps;
+
+			float x = sin(r * Math_TAU);
+			float z = cos(r * Math_TAU);
+
+			float u = 0.5 + ((x + 1.0) * 0.25);
+			float v = 1.0 - ((z + 1.0) * 0.25);
+
+			Vector3 p = Vector3(x * rm, y, z * rm);
+			points.push_back(p);
+			normals.push_back(Vector3(0.0, -1.0, 0.0));
+			ADD_TANGENT(1.0, 0.0, 0.0, 1.0)
+			uvs.push_back(Vector2(u, v));
+			point++;
+
+			bone_indices.push_back(sections);
+			bone_indices.push_back(0);
+			bone_indices.push_back(0);
+			bone_indices.push_back(0);
+
+			bone_weights.push_back(1.0);
+			bone_weights.push_back(0);
+			bone_weights.push_back(0);
+			bone_weights.push_back(0);
+
+			if (i > 0) {
+				indices.push_back(thisrow);
+				indices.push_back(point - 2);
+				indices.push_back(point - 1);
+			};
+		};
+	};
+
+	p_arr[RS::ARRAY_VERTEX] = points;
+	p_arr[RS::ARRAY_NORMAL] = normals;
+	p_arr[RS::ARRAY_TANGENT] = tangents;
+	p_arr[RS::ARRAY_TEX_UV] = uvs;
+	p_arr[RS::ARRAY_BONES] = bone_indices;
+	p_arr[RS::ARRAY_WEIGHTS] = bone_weights;
+	p_arr[RS::ARRAY_INDEX] = indices;
+}
+
+void TubeTrailMesh::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("set_radius", "radius"), &TubeTrailMesh::set_radius);
+	ClassDB::bind_method(D_METHOD("get_radius"), &TubeTrailMesh::get_radius);
+
+	ClassDB::bind_method(D_METHOD("set_radial_steps", "radial_steps"), &TubeTrailMesh::set_radial_steps);
+	ClassDB::bind_method(D_METHOD("get_radial_steps"), &TubeTrailMesh::get_radial_steps);
+
+	ClassDB::bind_method(D_METHOD("set_sections", "sections"), &TubeTrailMesh::set_sections);
+	ClassDB::bind_method(D_METHOD("get_sections"), &TubeTrailMesh::get_sections);
+
+	ClassDB::bind_method(D_METHOD("set_section_length", "section_length"), &TubeTrailMesh::set_section_length);
+	ClassDB::bind_method(D_METHOD("get_section_length"), &TubeTrailMesh::get_section_length);
+
+	ClassDB::bind_method(D_METHOD("set_section_rings", "section_rings"), &TubeTrailMesh::set_section_rings);
+	ClassDB::bind_method(D_METHOD("get_section_rings"), &TubeTrailMesh::get_section_rings);
+
+	ClassDB::bind_method(D_METHOD("set_curve", "curve"), &TubeTrailMesh::set_curve);
+	ClassDB::bind_method(D_METHOD("get_curve"), &TubeTrailMesh::get_curve);
+
+	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "radius", PROPERTY_HINT_RANGE, "0.001,100.0,0.001,or_greater"), "set_radius", "get_radius");
+
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "radial_steps", PROPERTY_HINT_RANGE, "3,128,1"), "set_radial_steps", "get_radial_steps");
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "sections", PROPERTY_HINT_RANGE, "2,128,1"), "set_sections", "get_sections");
+
+	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "section_length", PROPERTY_HINT_RANGE, "0.001,1024.0,0.001,or_greater"), "set_section_length", "get_section_length");
+
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "section_rings", PROPERTY_HINT_RANGE, "1,128,1"), "set_section_rings", "get_section_rings");
+
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "curve", PROPERTY_HINT_RESOURCE_TYPE, "Curve"), "set_curve", "get_curve");
+}
+
+TubeTrailMesh::TubeTrailMesh() {
+}
+
+// TUBE TRAIL
+
+void RibbonTrailMesh::set_shape(Shape p_shape) {
+	shape = p_shape;
+	_request_update();
+}
+RibbonTrailMesh::Shape RibbonTrailMesh::get_shape() const {
+	return shape;
+}
+
+void RibbonTrailMesh::set_size(const float p_size) {
+	size = p_size;
+	_request_update();
+}
+float RibbonTrailMesh::get_size() const {
+	return size;
+}
+
+void RibbonTrailMesh::set_sections(const int p_sections) {
+	ERR_FAIL_COND(p_sections < 2 || p_sections > 128);
+	sections = p_sections;
+	_request_update();
+}
+int RibbonTrailMesh::get_sections() const {
+	return sections;
+}
+
+void RibbonTrailMesh::set_section_length(float p_section_length) {
+	section_length = p_section_length;
+	_request_update();
+}
+float RibbonTrailMesh::get_section_length() const {
+	return section_length;
+}
+
+void RibbonTrailMesh::set_section_segments(const int p_section_segments) {
+	ERR_FAIL_COND(p_section_segments < 1 || p_section_segments > 1024);
+	section_segments = p_section_segments;
+	_request_update();
+}
+int RibbonTrailMesh::get_section_segments() const {
+	return section_segments;
+}
+
+void RibbonTrailMesh::set_curve(const Ref<Curve> &p_curve) {
+	if (curve == p_curve) {
+		return;
+	}
+	if (curve.is_valid()) {
+		curve->disconnect("changed", callable_mp(this, &RibbonTrailMesh::_curve_changed));
+	}
+	curve = p_curve;
+	if (curve.is_valid()) {
+		curve->connect("changed", callable_mp(this, &RibbonTrailMesh::_curve_changed));
+	}
+	_request_update();
+}
+Ref<Curve> RibbonTrailMesh::get_curve() const {
+	return curve;
+}
+
+void RibbonTrailMesh::_curve_changed() {
+	_request_update();
+}
+int RibbonTrailMesh::get_builtin_bind_pose_count() const {
+	return sections + 1;
+}
+
+Transform RibbonTrailMesh::get_builtin_bind_pose(int p_index) const {
+	float depth = section_length * sections;
+
+	Transform xform;
+	xform.origin.y = depth / 2.0 - section_length * float(p_index);
+	xform.origin.y = -xform.origin.y; //bind is an inverse transform, so negate y
+
+	return xform;
+}
+
+void RibbonTrailMesh::_create_mesh_array(Array &p_arr) const {
+	PackedVector3Array points;
+	PackedVector3Array normals;
+	PackedFloat32Array tangents;
+	PackedVector2Array uvs;
+	PackedInt32Array bone_indices;
+	PackedFloat32Array bone_weights;
+	PackedInt32Array indices;
+
+#define ADD_TANGENT(m_x, m_y, m_z, m_d) \
+	tangents.push_back(m_x);            \
+	tangents.push_back(m_y);            \
+	tangents.push_back(m_z);            \
+	tangents.push_back(m_d);
+
+	int total_segments = section_segments * sections;
+	float depth = section_length * sections;
+
+	for (int j = 0; j <= total_segments; j++) {
+		float v = j;
+		v /= total_segments;
+
+		float y = depth * v;
+		y = (depth * 0.5) - y;
+
+		int bone = j / section_segments;
+		float blend = 1.0 - float(j % section_segments) / float(section_segments);
+
+		float s = size;
+
+		if (curve.is_valid() && curve->get_point_count() > 0) {
+			s *= curve->interpolate_baked(v);
+		}
+
+		points.push_back(Vector3(-s * 0.5, y, 0));
+		points.push_back(Vector3(+s * 0.5, y, 0));
+		if (shape == SHAPE_CROSS) {
+			points.push_back(Vector3(0, y, -s * 0.5));
+			points.push_back(Vector3(0, y, +s * 0.5));
+		}
+
+		normals.push_back(Vector3(0, 0, 1));
+		normals.push_back(Vector3(0, 0, 1));
+		if (shape == SHAPE_CROSS) {
+			normals.push_back(Vector3(1, 0, 0));
+			normals.push_back(Vector3(1, 0, 0));
+		}
+
+		uvs.push_back(Vector2(0, v));
+		uvs.push_back(Vector2(1, v));
+		if (shape == SHAPE_CROSS) {
+			uvs.push_back(Vector2(0, v));
+			uvs.push_back(Vector2(1, v));
+		}
+
+		ADD_TANGENT(0.0, 1.0, 0.0, 1.0)
+		ADD_TANGENT(0.0, 1.0, 0.0, 1.0)
+		if (shape == SHAPE_CROSS) {
+			ADD_TANGENT(0.0, 1.0, 0.0, 1.0)
+			ADD_TANGENT(0.0, 1.0, 0.0, 1.0)
+		}
+
+		for (int i = 0; i < (shape == SHAPE_CROSS ? 4 : 2); i++) {
+			bone_indices.push_back(bone);
+			bone_indices.push_back(MIN(sections, bone + 1));
+			bone_indices.push_back(0);
+			bone_indices.push_back(0);
+
+			bone_weights.push_back(blend);
+			bone_weights.push_back(1.0 - blend);
+			bone_weights.push_back(0);
+			bone_weights.push_back(0);
+		}
+
+		if (j > 0) {
+			if (shape == SHAPE_CROSS) {
+				int base = j * 4 - 4;
+				indices.push_back(base + 0);
+				indices.push_back(base + 1);
+				indices.push_back(base + 4);
+
+				indices.push_back(base + 1);
+				indices.push_back(base + 5);
+				indices.push_back(base + 4);
+
+				indices.push_back(base + 2);
+				indices.push_back(base + 3);
+				indices.push_back(base + 6);
+
+				indices.push_back(base + 3);
+				indices.push_back(base + 7);
+				indices.push_back(base + 6);
+			} else {
+				int base = j * 2 - 2;
+				indices.push_back(base + 0);
+				indices.push_back(base + 1);
+				indices.push_back(base + 2);
+
+				indices.push_back(base + 1);
+				indices.push_back(base + 3);
+				indices.push_back(base + 2);
+			}
+		}
+	}
+
+	p_arr[RS::ARRAY_VERTEX] = points;
+	p_arr[RS::ARRAY_NORMAL] = normals;
+	p_arr[RS::ARRAY_TANGENT] = tangents;
+	p_arr[RS::ARRAY_TEX_UV] = uvs;
+	p_arr[RS::ARRAY_BONES] = bone_indices;
+	p_arr[RS::ARRAY_WEIGHTS] = bone_weights;
+	p_arr[RS::ARRAY_INDEX] = indices;
+}
+
+void RibbonTrailMesh::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("set_size", "size"), &RibbonTrailMesh::set_size);
+	ClassDB::bind_method(D_METHOD("get_size"), &RibbonTrailMesh::get_size);
+
+	ClassDB::bind_method(D_METHOD("set_sections", "sections"), &RibbonTrailMesh::set_sections);
+	ClassDB::bind_method(D_METHOD("get_sections"), &RibbonTrailMesh::get_sections);
+
+	ClassDB::bind_method(D_METHOD("set_section_length", "section_length"), &RibbonTrailMesh::set_section_length);
+	ClassDB::bind_method(D_METHOD("get_section_length"), &RibbonTrailMesh::get_section_length);
+
+	ClassDB::bind_method(D_METHOD("set_section_segments", "section_segments"), &RibbonTrailMesh::set_section_segments);
+	ClassDB::bind_method(D_METHOD("get_section_segments"), &RibbonTrailMesh::get_section_segments);
+
+	ClassDB::bind_method(D_METHOD("set_curve", "curve"), &RibbonTrailMesh::set_curve);
+	ClassDB::bind_method(D_METHOD("get_curve"), &RibbonTrailMesh::get_curve);
+
+	ClassDB::bind_method(D_METHOD("set_shape", "shape"), &RibbonTrailMesh::set_shape);
+	ClassDB::bind_method(D_METHOD("get_shape"), &RibbonTrailMesh::get_shape);
+
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "shape", PROPERTY_HINT_ENUM, "Flat,Cross"), "set_shape", "get_shape");
+	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "size", PROPERTY_HINT_RANGE, "0.001,100.0,0.001,or_greater"), "set_size", "get_size");
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "sections", PROPERTY_HINT_RANGE, "2,128,1"), "set_sections", "get_sections");
+	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "section_length", PROPERTY_HINT_RANGE, "0.001,1024.0,0.001,or_greater"), "set_section_length", "get_section_length");
+	ADD_PROPERTY(PropertyInfo(Variant::INT, "section_segments", PROPERTY_HINT_RANGE, "1,128,1"), "set_section_segments", "get_section_segments");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "curve", PROPERTY_HINT_RESOURCE_TYPE, "Curve"), "set_curve", "get_curve");
+
+	BIND_ENUM_CONSTANT(SHAPE_FLAT)
+	BIND_ENUM_CONSTANT(SHAPE_CROSS)
+}
+
+RibbonTrailMesh::RibbonTrailMesh() {
+}
diff --git a/scene/resources/primitive_meshes.h b/scene/resources/primitive_meshes.h
index 65ecdfc19d..ec5806489e 100644
--- a/scene/resources/primitive_meshes.h
+++ b/scene/resources/primitive_meshes.h
@@ -336,4 +336,98 @@ public:
 	PointMesh();
 };
 
+class TubeTrailMesh : public PrimitiveMesh {
+	GDCLASS(TubeTrailMesh, PrimitiveMesh);
+
+private:
+	float radius = 1.0;
+	int radial_steps = 8;
+	int sections = 5;
+	float section_length = 0.2;
+	int section_rings = 3;
+
+	Ref<Curve> curve;
+
+	void _curve_changed();
+
+protected:
+	static void _bind_methods();
+	virtual void _create_mesh_array(Array &p_arr) const override;
+
+public:
+	void set_radius(const float p_radius);
+	float get_radius() const;
+
+	void set_radial_steps(const int p_radial_steps);
+	int get_radial_steps() const;
+
+	void set_sections(const int p_sections);
+	int get_sections() const;
+
+	void set_section_length(float p_sectionlength);
+	float get_section_length() const;
+
+	void set_section_rings(const int p_section_rings);
+	int get_section_rings() const;
+
+	void set_curve(const Ref<Curve> &p_curve);
+	Ref<Curve> get_curve() const;
+
+	virtual int get_builtin_bind_pose_count() const override;
+	virtual Transform get_builtin_bind_pose(int p_index) const override;
+
+	TubeTrailMesh();
+};
+
+class RibbonTrailMesh : public PrimitiveMesh {
+	GDCLASS(RibbonTrailMesh, PrimitiveMesh);
+
+public:
+	enum Shape {
+		SHAPE_FLAT,
+		SHAPE_CROSS
+	};
+
+private:
+	float size = 1.0;
+	int sections = 5;
+	float section_length = 0.2;
+	int section_segments = 3;
+
+	Shape shape = SHAPE_CROSS;
+
+	Ref<Curve> curve;
+
+	void _curve_changed();
+
+protected:
+	static void _bind_methods();
+	virtual void _create_mesh_array(Array &p_arr) const override;
+
+public:
+	void set_shape(Shape p_shape);
+	Shape get_shape() const;
+
+	void set_size(const float p_size);
+	float get_size() const;
+
+	void set_sections(const int p_sections);
+	int get_sections() const;
+
+	void set_section_length(float p_sectionlength);
+	float get_section_length() const;
+
+	void set_section_segments(const int p_section_segments);
+	int get_section_segments() const;
+
+	void set_curve(const Ref<Curve> &p_curve);
+	Ref<Curve> get_curve() const;
+
+	virtual int get_builtin_bind_pose_count() const override;
+	virtual Transform get_builtin_bind_pose(int p_index) const override;
+
+	RibbonTrailMesh();
+};
+
+VARIANT_ENUM_CAST(RibbonTrailMesh::Shape)
 #endif
diff --git a/scene/resources/surface_tool.cpp b/scene/resources/surface_tool.cpp
index 3d3900ecc5..c30bd7927d 100644
--- a/scene/resources/surface_tool.cpp
+++ b/scene/resources/surface_tool.cpp
@@ -1105,7 +1105,7 @@ void SurfaceTool::optimize_indices_for_cache() {
 	ERR_FAIL_COND(index_array.size() == 0);
 
 	LocalVector old_index_array = index_array;
-	zeromem(index_array.ptr(), index_array.size() * sizeof(int));
+	memset(index_array.ptr(), 0, index_array.size() * sizeof(int));
 	optimize_vertex_cache_func((unsigned int *)index_array.ptr(), (unsigned int *)old_index_array.ptr(), old_index_array.size(), vertex_array.size());
 }
 
diff --git a/scene/resources/texture.cpp b/scene/resources/texture.cpp
index b6a2f24b8b..624eae0411 100644
--- a/scene/resources/texture.cpp
+++ b/scene/resources/texture.cpp
@@ -410,7 +410,7 @@ Ref<Image> StreamTexture2D::load_image_from_file(FileAccess *f, int p_size_limit
 					Vector<uint8_t> id = mipmap_images[i]->get_data();
 					int len = id.size();
 					const uint8_t *r = id.ptr();
-					copymem(&wr[ofs], r, len);
+					memcpy(&wr[ofs], r, len);
 					ofs += len;
 				}
 			}
@@ -1405,185 +1405,6 @@ MeshTexture::MeshTexture() {
 
 //////////////////////////////////////////
 
-int LargeTexture::get_width() const {
-	return size.width;
-}
-
-int LargeTexture::get_height() const {
-	return size.height;
-}
-
-RID LargeTexture::get_rid() const {
-	return RID();
-}
-
-bool LargeTexture::has_alpha() const {
-	for (int i = 0; i < pieces.size(); i++) {
-		if (pieces[i].texture->has_alpha()) {
-			return true;
-		}
-	}
-
-	return false;
-}
-
-int LargeTexture::add_piece(const Point2 &p_offset, const Ref<Texture2D> &p_texture) {
-	ERR_FAIL_COND_V(p_texture.is_null(), -1);
-	Piece p;
-	p.offset = p_offset;
-	p.texture = p_texture;
-	pieces.push_back(p);
-
-	return pieces.size() - 1;
-}
-
-void LargeTexture::set_piece_offset(int p_idx, const Point2 &p_offset) {
-	ERR_FAIL_INDEX(p_idx, pieces.size());
-	pieces.write[p_idx].offset = p_offset;
-};
-
-void LargeTexture::set_piece_texture(int p_idx, const Ref<Texture2D> &p_texture) {
-	ERR_FAIL_COND(p_texture == this);
-	ERR_FAIL_COND(p_texture.is_null());
-	ERR_FAIL_INDEX(p_idx, pieces.size());
-	pieces.write[p_idx].texture = p_texture;
-};
-
-void LargeTexture::set_size(const Size2 &p_size) {
-	size = p_size;
-}
-
-void LargeTexture::clear() {
-	pieces.clear();
-	size = Size2i();
-}
-
-Array LargeTexture::_get_data() const {
-	Array arr;
-	for (int i = 0; i < pieces.size(); i++) {
-		arr.push_back(pieces[i].offset);
-		arr.push_back(pieces[i].texture);
-	}
-	arr.push_back(Size2(size));
-	return arr;
-}
-
-void LargeTexture::_set_data(const Array &p_array) {
-	ERR_FAIL_COND(p_array.size() < 1);
-	ERR_FAIL_COND(!(p_array.size() & 1));
-	clear();
-	for (int i = 0; i < p_array.size() - 1; i += 2) {
-		add_piece(p_array[i], p_array[i + 1]);
-	}
-	size = Size2(p_array[p_array.size() - 1]);
-}
-
-int LargeTexture::get_piece_count() const {
-	return pieces.size();
-}
-
-Vector2 LargeTexture::get_piece_offset(int p_idx) const {
-	ERR_FAIL_INDEX_V(p_idx, pieces.size(), Vector2());
-	return pieces[p_idx].offset;
-}
-
-Ref<Texture2D> LargeTexture::get_piece_texture(int p_idx) const {
-	ERR_FAIL_INDEX_V(p_idx, pieces.size(), Ref<Texture2D>());
-	return pieces[p_idx].texture;
-}
-
-Ref<Image> LargeTexture::to_image() const {
-	Ref<Image> img = memnew(Image(this->get_width(), this->get_height(), false, Image::FORMAT_RGBA8));
-	for (int i = 0; i < pieces.size(); i++) {
-		Ref<Image> src_img = pieces[i].texture->get_image();
-		img->blit_rect(src_img, Rect2(0, 0, src_img->get_width(), src_img->get_height()), pieces[i].offset);
-	}
-
-	return img;
-}
-
-void LargeTexture::_bind_methods() {
-	ClassDB::bind_method(D_METHOD("add_piece", "ofs", "texture"), &LargeTexture::add_piece);
-	ClassDB::bind_method(D_METHOD("set_piece_offset", "idx", "ofs"), &LargeTexture::set_piece_offset);
-	ClassDB::bind_method(D_METHOD("set_piece_texture", "idx", "texture"), &LargeTexture::set_piece_texture);
-	ClassDB::bind_method(D_METHOD("set_size", "size"), &LargeTexture::set_size);
-	ClassDB::bind_method(D_METHOD("clear"), &LargeTexture::clear);
-
-	ClassDB::bind_method(D_METHOD("get_piece_count"), &LargeTexture::get_piece_count);
-	ClassDB::bind_method(D_METHOD("get_piece_offset", "idx"), &LargeTexture::get_piece_offset);
-	ClassDB::bind_method(D_METHOD("get_piece_texture", "idx"), &LargeTexture::get_piece_texture);
-
-	ClassDB::bind_method(D_METHOD("_set_data", "data"), &LargeTexture::_set_data);
-	ClassDB::bind_method(D_METHOD("_get_data"), &LargeTexture::_get_data);
-
-	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "_data", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NOEDITOR | PROPERTY_USAGE_INTERNAL), "_set_data", "_get_data");
-}
-
-void LargeTexture::draw(RID p_canvas_item, const Point2 &p_pos, const Color &p_modulate, bool p_transpose) const {
-	for (int i = 0; i < pieces.size(); i++) {
-		// TODO
-		pieces[i].texture->draw(p_canvas_item, pieces[i].offset + p_pos, p_modulate, p_transpose);
-	}
-}
-
-void LargeTexture::draw_rect(RID p_canvas_item, const Rect2 &p_rect, bool p_tile, const Color &p_modulate, bool p_transpose) const {
-	//tiling not supported for this
-	if (size.x == 0 || size.y == 0) {
-		return;
-	}
-
-	Size2 scale = p_rect.size / size;
-
-	for (int i = 0; i < pieces.size(); i++) {
-		// TODO
-		pieces[i].texture->draw_rect(p_canvas_item, Rect2(pieces[i].offset * scale + p_rect.position, pieces[i].texture->get_size() * scale), false, p_modulate, p_transpose);
-	}
-}
-
-void LargeTexture::draw_rect_region(RID p_canvas_item, const Rect2 &p_rect, const Rect2 &p_src_rect, const Color &p_modulate, bool p_transpose, bool p_clip_uv) const {
-	//tiling not supported for this
-	if (p_src_rect.size.x == 0 || p_src_rect.size.y == 0) {
-		return;
-	}
-
-	Size2 scale = p_rect.size / p_src_rect.size;
-
-	for (int i = 0; i < pieces.size(); i++) {
-		// TODO
-		Rect2 rect(pieces[i].offset, pieces[i].texture->get_size());
-		if (!p_src_rect.intersects(rect)) {
-			continue;
-		}
-		Rect2 local = p_src_rect.intersection(rect);
-		Rect2 target = local;
-		target.size *= scale;
-		target.position = p_rect.position + (p_src_rect.position + rect.position) * scale;
-		local.position -= rect.position;
-		pieces[i].texture->draw_rect_region(p_canvas_item, target, local, p_modulate, p_transpose, false);
-	}
-}
-
-bool LargeTexture::is_pixel_opaque(int p_x, int p_y) const {
-	for (int i = 0; i < pieces.size(); i++) {
-		// TODO
-		if (!pieces[i].texture.is_valid()) {
-			continue;
-		}
-
-		Rect2 rect(pieces[i].offset, pieces[i].texture->get_size());
-		if (rect.has_point(Point2(p_x, p_y))) {
-			return pieces[i].texture->is_pixel_opaque(p_x - rect.position.x, p_y - rect.position.y);
-		}
-	}
-
-	return true;
-}
-
-LargeTexture::LargeTexture() {
-}
-
-///////////////////
-
 void CurveTexture::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_width", "width"), &CurveTexture::set_width);
 
diff --git a/scene/resources/texture.h b/scene/resources/texture.h
index 16c98f2891..264d85d187 100644
--- a/scene/resources/texture.h
+++ b/scene/resources/texture.h
@@ -297,51 +297,6 @@ public:
 	MeshTexture();
 };
 
-class LargeTexture : public Texture2D {
-	GDCLASS(LargeTexture, Texture2D);
-	RES_BASE_EXTENSION("largetex");
-
-protected:
-	struct Piece {
-		Point2 offset;
-		Ref<Texture2D> texture;
-	};
-
-	Vector<Piece> pieces;
-	Size2i size;
-
-	Array _get_data() const;
-	void _set_data(const Array &p_array);
-	static void _bind_methods();
-
-public:
-	virtual int get_width() const override;
-	virtual int get_height() const override;
-	virtual RID get_rid() const override;
-
-	virtual bool has_alpha() const override;
-
-	int add_piece(const Point2 &p_offset, const Ref<Texture2D> &p_texture);
-	void set_piece_offset(int p_idx, const Point2 &p_offset);
-	void set_piece_texture(int p_idx, const Ref<Texture2D> &p_texture);
-
-	void set_size(const Size2 &p_size);
-	void clear();
-
-	int get_piece_count() const;
-	Vector2 get_piece_offset(int p_idx) const;
-	Ref<Texture2D> get_piece_texture(int p_idx) const;
-	Ref<Image> to_image() const;
-
-	virtual void draw(RID p_canvas_item, const Point2 &p_pos, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false) const override;
-	virtual void draw_rect(RID p_canvas_item, const Rect2 &p_rect, bool p_tile = false, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false) const override;
-	virtual void draw_rect_region(RID p_canvas_item, const Rect2 &p_rect, const Rect2 &p_src_rect, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, bool p_clip_uv = true) const override;
-
-	bool is_pixel_opaque(int p_x, int p_y) const override;
-
-	LargeTexture();
-};
-
 class TextureLayered : public Texture {
 	GDCLASS(TextureLayered, Texture);
 
diff --git a/scene/resources/visual_shader.cpp b/scene/resources/visual_shader.cpp
index d09cf4b971..b810f9562e 100644
--- a/scene/resources/visual_shader.cpp
+++ b/scene/resources/visual_shader.cpp
@@ -300,6 +300,30 @@ String VisualShaderNodeCustom::generate_global_per_node(Shader::Mode p_mode, Vis
 	return "";
 }
 
+void VisualShaderNodeCustom::set_input_port_default_value(int p_port, const Variant &p_value) {
+	if (!is_initialized) {
+		VisualShaderNode::set_input_port_default_value(p_port, p_value);
+	}
+}
+
+void VisualShaderNodeCustom::set_default_input_values(const Array &p_values) {
+	if (!is_initialized) {
+		VisualShaderNode::set_default_input_values(p_values);
+	}
+}
+
+void VisualShaderNodeCustom::_set_input_port_default_value(int p_port, const Variant &p_value) {
+	VisualShaderNode::set_input_port_default_value(p_port, p_value);
+}
+
+bool VisualShaderNodeCustom::_is_initialized() {
+	return is_initialized;
+}
+
+void VisualShaderNodeCustom::_set_initialized(bool p_enabled) {
+	is_initialized = p_enabled;
+}
+
 void VisualShaderNodeCustom::_bind_methods() {
 	BIND_VMETHOD(MethodInfo(Variant::STRING, "_get_name"));
 	BIND_VMETHOD(MethodInfo(Variant::STRING, "_get_description"));
@@ -314,6 +338,12 @@ void VisualShaderNodeCustom::_bind_methods() {
 	BIND_VMETHOD(MethodInfo(Variant::STRING, "_get_code", PropertyInfo(Variant::ARRAY, "input_vars"), PropertyInfo(Variant::ARRAY, "output_vars"), PropertyInfo(Variant::INT, "mode"), PropertyInfo(Variant::INT, "type")));
 	BIND_VMETHOD(MethodInfo(Variant::STRING, "_get_global_code", PropertyInfo(Variant::INT, "mode")));
 	BIND_VMETHOD(MethodInfo(Variant::BOOL, "_is_highend"));
+
+	ClassDB::bind_method(D_METHOD("_set_initialized", "enabled"), &VisualShaderNodeCustom::_set_initialized);
+	ClassDB::bind_method(D_METHOD("_is_initialized"), &VisualShaderNodeCustom::_is_initialized);
+	ClassDB::bind_method(D_METHOD("_set_input_port_default_value", "port", "value"), &VisualShaderNodeCustom::_set_input_port_default_value);
+
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "initialized", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NOEDITOR | PROPERTY_USAGE_INTERNAL), "_set_initialized", "_is_initialized");
 }
 
 VisualShaderNodeCustom::VisualShaderNodeCustom() {
diff --git a/scene/resources/visual_shader.h b/scene/resources/visual_shader.h
index e2e1b473ed..8af0fc9e44 100644
--- a/scene/resources/visual_shader.h
+++ b/scene/resources/visual_shader.h
@@ -223,10 +223,10 @@ public:
 	virtual PortType get_input_port_type(int p_port) const = 0;
 	virtual String get_input_port_name(int p_port) const = 0;
 
-	void set_input_port_default_value(int p_port, const Variant &p_value);
+	virtual void set_input_port_default_value(int p_port, const Variant &p_value);
 	Variant get_input_port_default_value(int p_port) const; // if NIL (default if node does not set anything) is returned, it means no default value is wanted if disconnected, thus no input var must be supplied (empty string will be supplied)
 	Array get_default_input_values() const;
-	void set_default_input_values(const Array &p_values);
+	virtual void set_default_input_values(const Array &p_values);
 
 	virtual int get_output_port_count() const = 0;
 	virtual PortType get_output_port_type(int p_port) const = 0;
@@ -272,6 +272,7 @@ class VisualShaderNodeCustom : public VisualShaderNode {
 		int type = 0;
 	};
 
+	bool is_initialized = false;
 	List<Port> input_ports;
 	List<Port> output_ports;
 
@@ -288,7 +289,12 @@ protected:
 	virtual PortType get_output_port_type(int p_port) const override;
 	virtual String get_output_port_name(int p_port) const override;
 
+	virtual void set_input_port_default_value(int p_port, const Variant &p_value) override;
+	virtual void set_default_input_values(const Array &p_values) override;
+
 protected:
+	void _set_input_port_default_value(int p_port, const Variant &p_value);
+
 	virtual String generate_code(Shader::Mode p_mode, VisualShader::Type p_type, int p_id, const String *p_input_vars, const String *p_output_vars, bool p_for_preview = false) const override;
 	virtual String generate_global_per_node(Shader::Mode p_mode, VisualShader::Type p_type, int p_id) const override;
 
@@ -297,6 +303,9 @@ protected:
 public:
 	VisualShaderNodeCustom();
 	void update_ports();
+
+	bool _is_initialized();
+	void _set_initialized(bool p_enabled);
 };
 
 /////
diff --git a/scene/resources/world_3d.cpp b/scene/resources/world_3d.cpp
index f067771d58..e811cbf57a 100644
--- a/scene/resources/world_3d.cpp
+++ b/scene/resources/world_3d.cpp
@@ -321,7 +321,7 @@ void World3D::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_environment"), &World3D::get_environment);
 	ClassDB::bind_method(D_METHOD("set_fallback_environment", "env"), &World3D::set_fallback_environment);
 	ClassDB::bind_method(D_METHOD("get_fallback_environment"), &World3D::get_fallback_environment);
-	ClassDB::bind_method(D_METHOD("set_camera_effects", "env"), &World3D::set_camera_effects);
+	ClassDB::bind_method(D_METHOD("set_camera_effects", "effects"), &World3D::set_camera_effects);
 	ClassDB::bind_method(D_METHOD("get_camera_effects"), &World3D::get_camera_effects);
 	ClassDB::bind_method(D_METHOD("get_direct_space_state"), &World3D::get_direct_space_state);
 	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "environment", PROPERTY_HINT_RESOURCE_TYPE, "Environment"), "set_environment", "get_environment");