Merge pull request #44468 from reduz/implement-lod

Implement automatic LOD (Level of Detail)

16 files changed, 214 insertions, 86 deletions

diff --git a/servers/rendering/renderer_rd/renderer_scene_render_forward.cpp b/servers/rendering/renderer_rd/renderer_scene_render_forward.cpp
index 9de7af3c22..123be779ef 100644
--- a/servers/rendering/renderer_rd/renderer_scene_render_forward.cpp
+++ b/servers/rendering/renderer_rd/renderer_scene_render_forward.cpp
@@ -953,7 +953,7 @@ void RendererSceneRenderForward::_fill_instances(RenderList::Element **p_element
 
 /// RENDERING ///
 
-void RendererSceneRenderForward::_render_list(RenderingDevice::DrawListID p_draw_list, RenderingDevice::FramebufferFormatID p_framebuffer_Format, RenderList::Element **p_elements, int p_element_count, bool p_reverse_cull, PassMode p_pass_mode, bool p_no_gi, RID p_render_pass_uniform_set, bool p_force_wireframe, const Vector2 &p_uv_offset) {
+void RendererSceneRenderForward::_render_list(RenderingDevice::DrawListID p_draw_list, RenderingDevice::FramebufferFormatID p_framebuffer_Format, RenderList::Element **p_elements, int p_element_count, bool p_reverse_cull, PassMode p_pass_mode, bool p_no_gi, RID p_render_pass_uniform_set, bool p_force_wireframe, const Vector2 &p_uv_offset, const Plane &p_lod_plane, float p_lod_distance_multiplier, float p_screen_lod_threshold) {
 	RD::DrawListID draw_list = p_draw_list;
 	RD::FramebufferFormatID framebuffer_format = p_framebuffer_Format;
 
@@ -996,10 +996,13 @@ void RendererSceneRenderForward::_render_list(RenderingDevice::DrawListID p_draw
 
 		//find primitive and vertex format
 		RS::PrimitiveType primitive;
+		void *mesh_surface = nullptr;
 
 		switch (e->instance->base_type) {
 			case RS::INSTANCE_MESH: {
-				primitive = storage->mesh_surface_get_primitive(e->instance->base, e->surface_index);
+				mesh_surface = storage->mesh_get_surface(e->instance->base, e->surface_index);
+
+				primitive = storage->mesh_surface_get_primitive(mesh_surface);
 				if (e->instance->skeleton.is_valid()) {
 					xforms_uniform_set = storage->skeleton_get_3d_uniform_set(e->instance->skeleton, default_shader_rd, TRANSFORMS_UNIFORM_SET);
 				}
@@ -1007,7 +1010,10 @@ void RendererSceneRenderForward::_render_list(RenderingDevice::DrawListID p_draw
 			case RS::INSTANCE_MULTIMESH: {
 				RID mesh = storage->multimesh_get_mesh(e->instance->base);
 				ERR_CONTINUE(!mesh.is_valid()); //should be a bug
-				primitive = storage->mesh_surface_get_primitive(mesh, e->surface_index);
+
+				mesh_surface = storage->mesh_get_surface(e->instance->base, e->surface_index);
+
+				primitive = storage->mesh_surface_get_primitive(mesh_surface);
 
 				xforms_uniform_set = storage->multimesh_get_3d_uniform_set(e->instance->base, default_shader_rd, TRANSFORMS_UNIFORM_SET);
 
@@ -1018,7 +1024,10 @@ void RendererSceneRenderForward::_render_list(RenderingDevice::DrawListID p_draw
 			case RS::INSTANCE_PARTICLES: {
 				RID mesh = storage->particles_get_draw_pass_mesh(e->instance->base, e->surface_index >> 16);
 				ERR_CONTINUE(!mesh.is_valid()); //should be a bug
-				primitive = storage->mesh_surface_get_primitive(mesh, e->surface_index & 0xFFFF);
+
+				mesh_surface = storage->mesh_get_surface(e->instance->base, e->surface_index & 0xFFFF);
+
+				primitive = storage->mesh_surface_get_primitive(mesh_surface);
 
 				xforms_uniform_set = storage->particles_get_instance_buffer_uniform_set(e->instance->base, default_shader_rd, TRANSFORMS_UNIFORM_SET);
 
@@ -1077,29 +1086,39 @@ void RendererSceneRenderForward::_render_list(RenderingDevice::DrawListID p_draw
 		RID vertex_array_rd;
 		RID index_array_rd;
 
-		switch (e->instance->base_type) {
-			case RS::INSTANCE_MESH: {
-				if (e->instance->mesh_instance.is_valid()) { //skeleton and blend shape
-					storage->mesh_instance_surface_get_arrays_and_format(e->instance->mesh_instance, e->surface_index, pipeline->get_vertex_input_mask(), vertex_array_rd, index_array_rd, vertex_format);
-				} else {
-					storage->mesh_surface_get_arrays_and_format(e->instance->base, e->surface_index, pipeline->get_vertex_input_mask(), vertex_array_rd, index_array_rd, vertex_format);
+		if (mesh_surface) {
+			if (e->instance->mesh_instance.is_valid()) { //skeleton and blend shape
+				storage->mesh_instance_surface_get_vertex_arrays_and_format(e->instance->mesh_instance, e->surface_index, pipeline->get_vertex_input_mask(), vertex_array_rd, vertex_format);
+			} else {
+				storage->mesh_surface_get_vertex_arrays_and_format(mesh_surface, pipeline->get_vertex_input_mask(), vertex_array_rd, vertex_format);
+			}
+
+			if (p_screen_lod_threshold > 0.0 && storage->mesh_surface_has_lod(mesh_surface)) {
+				Vector3 support_min = e->instance->transformed_aabb.get_support(-p_lod_plane.normal);
+				Vector3 support_max = e->instance->transformed_aabb.get_support(p_lod_plane.normal);
+
+				float distance_min = p_lod_plane.distance_to(support_min);
+				float distance_max = p_lod_plane.distance_to(support_max);
+
+				float distance = 0.0;
+
+				if (distance_min * distance_max < 0.0) {
+					//crossing plane
+					distance = 0.0;
+				} else if (distance_min >= 0.0) {
+					distance = distance_min;
+				} else if (distance_max <= 0.0) {
+					distance = -distance_max;
 				}
-			} break;
-			case RS::INSTANCE_MULTIMESH: {
-				RID mesh = storage->multimesh_get_mesh(e->instance->base);
-				ERR_CONTINUE(!mesh.is_valid()); //should be a bug
-				storage->mesh_surface_get_arrays_and_format(mesh, e->surface_index, pipeline->get_vertex_input_mask(), vertex_array_rd, index_array_rd, vertex_format);
-			} break;
-			case RS::INSTANCE_IMMEDIATE: {
-				ERR_CONTINUE(true); //should be a bug
-			} break;
-			case RS::INSTANCE_PARTICLES: {
-				RID mesh = storage->particles_get_draw_pass_mesh(e->instance->base, e->surface_index >> 16);
-				ERR_CONTINUE(!mesh.is_valid()); //should be a bug
-				storage->mesh_surface_get_arrays_and_format(mesh, e->surface_index & 0xFFFF, pipeline->get_vertex_input_mask(), vertex_array_rd, index_array_rd, vertex_format);
-			} break;
-			default: {
-				ERR_CONTINUE(true); //should be a bug
+
+				Vector3 model_scale_vec = e->instance->transform.basis.get_scale_abs();
+
+				float model_scale = MAX(model_scale_vec.x, MAX(model_scale_vec.y, model_scale_vec.z));
+
+				index_array_rd = storage->mesh_surface_get_index_array_with_lod(mesh_surface, model_scale * e->instance->lod_bias, distance * p_lod_distance_multiplier, p_screen_lod_threshold);
+
+			} else {
+				index_array_rd = storage->mesh_surface_get_index_array(mesh_surface);
 			}
 		}
 
@@ -1635,7 +1654,7 @@ void RendererSceneRenderForward::_setup_lightmaps(InstanceBase **p_lightmap_cull
 	}
 }
 
-void RendererSceneRenderForward::_render_scene(RID p_render_buffer, const Transform &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_ortogonal, InstanceBase **p_cull_result, int p_cull_count, int p_directional_light_count, RID *p_gi_probe_cull_result, int p_gi_probe_cull_count, InstanceBase **p_lightmap_cull_result, int p_lightmap_cull_count, RID p_environment, RID p_camera_effects, RID p_shadow_atlas, RID p_reflection_atlas, RID p_reflection_probe, int p_reflection_probe_pass, const Color &p_default_bg_color) {
+void RendererSceneRenderForward::_render_scene(RID p_render_buffer, const Transform &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_ortogonal, InstanceBase **p_cull_result, int p_cull_count, int p_directional_light_count, RID *p_gi_probe_cull_result, int p_gi_probe_cull_count, InstanceBase **p_lightmap_cull_result, int p_lightmap_cull_count, RID p_environment, RID p_camera_effects, RID p_shadow_atlas, RID p_reflection_atlas, RID p_reflection_probe, int p_reflection_probe_pass, const Color &p_default_bg_color, float p_screen_lod_threshold) {
 	RenderBufferDataForward *render_buffer = nullptr;
 	if (p_render_buffer.is_valid()) {
 		render_buffer = (RenderBufferDataForward *)render_buffers_get_data(p_render_buffer);
@@ -1654,6 +1673,13 @@ void RendererSceneRenderForward::_render_scene(RID p_render_buffer, const Transf
 		scene_state.ubo.reflection_multiplier = 1.0;
 	}
 
+	float lod_distance_multiplier = p_cam_projection.get_lod_multiplier();
+	Plane lod_camera_plane(p_cam_transform.get_origin(), -p_cam_transform.basis.get_axis(Vector3::AXIS_Z));
+
+	if (get_debug_draw_mode() == RS::VIEWPORT_DEBUG_DRAW_DISABLE_LOD) {
+		p_screen_lod_threshold = 0.0;
+	}
+
 	//scene_state.ubo.subsurface_scatter_width = subsurface_scatter_size;
 
 	Vector2 vp_he = p_cam_projection.get_viewport_half_extents();
@@ -1856,7 +1882,7 @@ void RendererSceneRenderForward::_render_scene(RID p_render_buffer, const Transf
 
 		bool finish_depth = using_ssao || using_sdfgi || using_giprobe;
 		RD::DrawListID draw_list = RD::get_singleton()->draw_list_begin(depth_framebuffer, RD::INITIAL_ACTION_CLEAR, RD::FINAL_ACTION_READ, RD::INITIAL_ACTION_CLEAR, finish_depth ? RD::FINAL_ACTION_READ : RD::FINAL_ACTION_CONTINUE, depth_pass_clear);
-		_render_list(draw_list, RD::get_singleton()->framebuffer_get_format(depth_framebuffer), render_list.elements, render_list.element_count, false, depth_pass_mode, render_buffer == nullptr, rp_uniform_set, get_debug_draw_mode() == RS::VIEWPORT_DEBUG_DRAW_WIREFRAME);
+		_render_list(draw_list, RD::get_singleton()->framebuffer_get_format(depth_framebuffer), render_list.elements, render_list.element_count, false, depth_pass_mode, render_buffer == nullptr, rp_uniform_set, get_debug_draw_mode() == RS::VIEWPORT_DEBUG_DRAW_WIREFRAME, Vector2(), lod_camera_plane, lod_distance_multiplier, p_screen_lod_threshold);
 		RD::get_singleton()->draw_list_end();
 
 		if (render_buffer && render_buffer->msaa != RS::VIEWPORT_MSAA_DISABLED) {
@@ -1904,7 +1930,7 @@ void RendererSceneRenderForward::_render_scene(RID p_render_buffer, const Transf
 
 		RID framebuffer = using_separate_specular ? opaque_specular_framebuffer : opaque_framebuffer;
 		RD::DrawListID draw_list = RD::get_singleton()->draw_list_begin(framebuffer, keep_color ? RD::INITIAL_ACTION_KEEP : RD::INITIAL_ACTION_CLEAR, will_continue_color ? RD::FINAL_ACTION_CONTINUE : RD::FINAL_ACTION_READ, depth_pre_pass ? (continue_depth ? RD::INITIAL_ACTION_KEEP : RD::INITIAL_ACTION_CONTINUE) : RD::INITIAL_ACTION_CLEAR, will_continue_depth ? RD::FINAL_ACTION_CONTINUE : RD::FINAL_ACTION_READ, c, 1.0, 0);
-		_render_list(draw_list, RD::get_singleton()->framebuffer_get_format(framebuffer), render_list.elements, render_list.element_count, false, using_separate_specular ? PASS_MODE_COLOR_SPECULAR : PASS_MODE_COLOR, render_buffer == nullptr, rp_uniform_set, get_debug_draw_mode() == RS::VIEWPORT_DEBUG_DRAW_WIREFRAME);
+		_render_list(draw_list, RD::get_singleton()->framebuffer_get_format(framebuffer), render_list.elements, render_list.element_count, false, using_separate_specular ? PASS_MODE_COLOR_SPECULAR : PASS_MODE_COLOR, render_buffer == nullptr, rp_uniform_set, get_debug_draw_mode() == RS::VIEWPORT_DEBUG_DRAW_WIREFRAME, Vector2(), lod_camera_plane, lod_distance_multiplier, p_screen_lod_threshold);
 		RD::get_singleton()->draw_list_end();
 
 		if (will_continue_color && using_separate_specular) {
@@ -1992,7 +2018,7 @@ void RendererSceneRenderForward::_render_scene(RID p_render_buffer, const Transf
 
 	{
 		RD::DrawListID draw_list = RD::get_singleton()->draw_list_begin(alpha_framebuffer, can_continue_color ? RD::INITIAL_ACTION_CONTINUE : RD::INITIAL_ACTION_KEEP, RD::FINAL_ACTION_READ, can_continue_depth ? RD::INITIAL_ACTION_CONTINUE : RD::INITIAL_ACTION_KEEP, RD::FINAL_ACTION_READ);
-		_render_list(draw_list, RD::get_singleton()->framebuffer_get_format(alpha_framebuffer), &render_list.elements[render_list.max_elements - render_list.alpha_element_count], render_list.alpha_element_count, false, PASS_MODE_COLOR, render_buffer == nullptr, rp_uniform_set, get_debug_draw_mode() == RS::VIEWPORT_DEBUG_DRAW_WIREFRAME);
+		_render_list(draw_list, RD::get_singleton()->framebuffer_get_format(alpha_framebuffer), &render_list.elements[render_list.max_elements - render_list.alpha_element_count], render_list.alpha_element_count, false, PASS_MODE_COLOR, render_buffer == nullptr, rp_uniform_set, get_debug_draw_mode() == RS::VIEWPORT_DEBUG_DRAW_WIREFRAME, Vector2(), lod_camera_plane, lod_distance_multiplier, p_screen_lod_threshold);
 		RD::get_singleton()->draw_list_end();
 	}
 
@@ -2001,7 +2027,7 @@ void RendererSceneRenderForward::_render_scene(RID p_render_buffer, const Transf
 	}
 }
 
-void RendererSceneRenderForward::_render_shadow(RID p_framebuffer, InstanceBase **p_cull_result, int p_cull_count, const CameraMatrix &p_projection, const Transform &p_transform, float p_zfar, float p_bias, float p_normal_bias, bool p_use_dp, bool p_use_dp_flip, bool p_use_pancake) {
+void RendererSceneRenderForward::_render_shadow(RID p_framebuffer, InstanceBase **p_cull_result, int p_cull_count, const CameraMatrix &p_projection, const Transform &p_transform, float p_zfar, float p_bias, float p_normal_bias, bool p_use_dp, bool p_use_dp_flip, bool p_use_pancake, const Plane &p_camera_plane, float p_lod_distance_multiplier, float p_screen_lod_threshold) {
 	RENDER_TIMESTAMP("Setup Rendering Shadow");
 
 	_update_render_base_uniform_set();
@@ -2012,6 +2038,10 @@ void RendererSceneRenderForward::_render_shadow(RID p_framebuffer, InstanceBase
 
 	_setup_environment(RID(), RID(), p_projection, p_transform, RID(), true, Vector2(1, 1), RID(), true, Color(), 0, p_zfar, false, p_use_pancake);
 
+	if (get_debug_draw_mode() == RS::VIEWPORT_DEBUG_DRAW_DISABLE_LOD) {
+		p_screen_lod_threshold = 0.0;
+	}
+
 	render_list.clear();
 
 	PassMode pass_mode = p_use_dp ? PASS_MODE_SHADOW_DP : PASS_MODE_SHADOW;
@@ -2029,7 +2059,7 @@ void RendererSceneRenderForward::_render_shadow(RID p_framebuffer, InstanceBase
 	{
 		//regular forward for now
 		RD::DrawListID draw_list = RD::get_singleton()->draw_list_begin(p_framebuffer, RD::INITIAL_ACTION_CLEAR, RD::FINAL_ACTION_READ, RD::INITIAL_ACTION_CLEAR, RD::FINAL_ACTION_READ);
-		_render_list(draw_list, RD::get_singleton()->framebuffer_get_format(p_framebuffer), render_list.elements, render_list.element_count, p_use_dp_flip, pass_mode, true, rp_uniform_set);
+		_render_list(draw_list, RD::get_singleton()->framebuffer_get_format(p_framebuffer), render_list.elements, render_list.element_count, p_use_dp_flip, pass_mode, true, rp_uniform_set, false, Vector2(), p_camera_plane, p_lod_distance_multiplier, p_screen_lod_threshold);
 		RD::get_singleton()->draw_list_end();
 	}
 }
diff --git a/servers/rendering/renderer_rd/renderer_scene_render_forward.h b/servers/rendering/renderer_rd/renderer_scene_render_forward.h
index 6d76d5f0eb..94284e509c 100644
--- a/servers/rendering/renderer_rd/renderer_scene_render_forward.h
+++ b/servers/rendering/renderer_rd/renderer_scene_render_forward.h
@@ -570,7 +570,7 @@ class RendererSceneRenderForward : public RendererSceneRenderRD {
 	void _setup_lightmaps(InstanceBase **p_lightmap_cull_result, int p_lightmap_cull_count, const Transform &p_cam_transform);
 
 	void _fill_instances(RenderList::Element **p_elements, int p_element_count, bool p_for_depth, bool p_has_sdfgi = false, bool p_has_opaque_gi = false);
-	void _render_list(RenderingDevice::DrawListID p_draw_list, RenderingDevice::FramebufferFormatID p_framebuffer_Format, RenderList::Element **p_elements, int p_element_count, bool p_reverse_cull, PassMode p_pass_mode, bool p_no_gi, RID p_render_pass_uniform_set, bool p_force_wireframe = false, const Vector2 &p_uv_offset = Vector2());
+	void _render_list(RenderingDevice::DrawListID p_draw_list, RenderingDevice::FramebufferFormatID p_framebuffer_Format, RenderList::Element **p_elements, int p_element_count, bool p_reverse_cull, PassMode p_pass_mode, bool p_no_gi, RID p_render_pass_uniform_set, bool p_force_wireframe = false, const Vector2 &p_uv_offset = Vector2(), const Plane &p_lod_plane = Plane(), float p_lod_distance_multiplier = 0.0, float p_screen_lod_threshold = 0.0);
 	_FORCE_INLINE_ void _add_geometry(InstanceBase *p_instance, uint32_t p_surface, RID p_material, PassMode p_pass_mode, uint32_t p_geometry_index, bool p_using_sdfgi = false);
 	_FORCE_INLINE_ void _add_geometry_with_material(InstanceBase *p_instance, uint32_t p_surface, MaterialData *p_material, RID p_material_rid, PassMode p_pass_mode, uint32_t p_geometry_index, bool p_using_sdfgi = false);
 
@@ -581,8 +581,8 @@ class RendererSceneRenderForward : public RendererSceneRenderRD {
 	bool low_end = false;
 
 protected:
-	virtual void _render_scene(RID p_render_buffer, const Transform &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_ortogonal, InstanceBase **p_cull_result, int p_cull_count, int p_directional_light_count, RID *p_gi_probe_cull_result, int p_gi_probe_cull_count, InstanceBase **p_lightmap_cull_result, int p_lightmap_cull_count, RID p_environment, RID p_camera_effects, RID p_shadow_atlas, RID p_reflection_atlas, RID p_reflection_probe, int p_reflection_probe_pass, const Color &p_default_bg_color);
-	virtual void _render_shadow(RID p_framebuffer, InstanceBase **p_cull_result, int p_cull_count, const CameraMatrix &p_projection, const Transform &p_transform, float p_zfar, float p_bias, float p_normal_bias, bool p_use_dp, bool p_use_dp_flip, bool p_use_pancake);
+	virtual void _render_scene(RID p_render_buffer, const Transform &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_ortogonal, InstanceBase **p_cull_result, int p_cull_count, int p_directional_light_count, RID *p_gi_probe_cull_result, int p_gi_probe_cull_count, InstanceBase **p_lightmap_cull_result, int p_lightmap_cull_count, RID p_environment, RID p_camera_effects, RID p_shadow_atlas, RID p_reflection_atlas, RID p_reflection_probe, int p_reflection_probe_pass, const Color &p_default_bg_color, float p_lod_threshold);
+	virtual void _render_shadow(RID p_framebuffer, InstanceBase **p_cull_result, int p_cull_count, const CameraMatrix &p_projection, const Transform &p_transform, float p_zfar, float p_bias, float p_normal_bias, bool p_use_dp, bool p_use_dp_flip, bool p_use_pancake, const Plane &p_camera_plane = Plane(), float p_lod_distance_multiplier = 0, float p_screen_lod_threshold = 0.0);
 	virtual void _render_material(const Transform &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_ortogonal, InstanceBase **p_cull_result, int p_cull_count, RID p_framebuffer, const Rect2i &p_region);
 	virtual void _render_uv2(InstanceBase **p_cull_result, int p_cull_count, RID p_framebuffer, const Rect2i &p_region);
 	virtual void _render_sdfgi(RID p_render_buffers, const Vector3i &p_from, const Vector3i &p_size, const AABB &p_bounds, InstanceBase **p_cull_result, int p_cull_count, const RID &p_albedo_texture, const RID &p_emission_texture, const RID &p_emission_aniso_texture, const RID &p_geom_facing_texture);
diff --git a/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp b/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp
index f880eb7d8a..4543ced8dc 100644
--- a/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp
+++ b/servers/rendering/renderer_rd/renderer_scene_render_rd.cpp
@@ -3255,6 +3255,13 @@ void RendererSceneRenderRD::reflection_atlas_set_size(RID p_ref_atlas, int p_ref
 	}
 }
 
+int RendererSceneRenderRD::reflection_atlas_get_size(RID p_ref_atlas) const {
+	ReflectionAtlas *ra = reflection_atlas_owner.getornull(p_ref_atlas);
+	ERR_FAIL_COND_V(!ra, 0);
+
+	return ra->size;
+}
+
 ////////////////////////
 RID RendererSceneRenderRD::reflection_probe_instance_create(RID p_probe) {
 	ReflectionProbeInstance rpi;
@@ -7012,7 +7019,7 @@ void RendererSceneRenderRD::_update_volumetric_fog(RID p_render_buffers, RID p_e
 	RD::get_singleton()->compute_list_end();
 }
 
-void RendererSceneRenderRD::render_scene(RID p_render_buffers, const Transform &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_ortogonal, InstanceBase **p_cull_result, int p_cull_count, RID *p_light_cull_result, int p_light_cull_count, RID *p_reflection_probe_cull_result, int p_reflection_probe_cull_count, RID *p_gi_probe_cull_result, int p_gi_probe_cull_count, RID *p_decal_cull_result, int p_decal_cull_count, InstanceBase **p_lightmap_cull_result, int p_lightmap_cull_count, RID p_environment, RID p_camera_effects, RID p_shadow_atlas, RID p_reflection_atlas, RID p_reflection_probe, int p_reflection_probe_pass) {
+void RendererSceneRenderRD::render_scene(RID p_render_buffers, const Transform &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_ortogonal, InstanceBase **p_cull_result, int p_cull_count, RID *p_light_cull_result, int p_light_cull_count, RID *p_reflection_probe_cull_result, int p_reflection_probe_cull_count, RID *p_gi_probe_cull_result, int p_gi_probe_cull_count, RID *p_decal_cull_result, int p_decal_cull_count, InstanceBase **p_lightmap_cull_result, int p_lightmap_cull_count, RID p_environment, RID p_camera_effects, RID p_shadow_atlas, RID p_reflection_atlas, RID p_reflection_probe, int p_reflection_probe_pass, float p_screen_lod_threshold) {
 	Color clear_color;
 	if (p_render_buffers.is_valid()) {
 		RenderBuffers *rb = render_buffers_owner.getornull(p_render_buffers);
@@ -7069,7 +7076,7 @@ void RendererSceneRenderRD::render_scene(RID p_render_buffers, const Transform &
 		_update_volumetric_fog(p_render_buffers, p_environment, p_cam_projection, p_cam_transform, p_shadow_atlas, directional_light_count, directional_shadows, positional_light_count, gi_probe_count);
 	}
 
-	_render_scene(p_render_buffers, p_cam_transform, p_cam_projection, p_cam_ortogonal, p_cull_result, p_cull_count, directional_light_count, p_gi_probe_cull_result, p_gi_probe_cull_count, p_lightmap_cull_result, p_lightmap_cull_count, p_environment, p_camera_effects, p_shadow_atlas, p_reflection_atlas, p_reflection_probe, p_reflection_probe_pass, clear_color);
+	_render_scene(p_render_buffers, p_cam_transform, p_cam_projection, p_cam_ortogonal, p_cull_result, p_cull_count, directional_light_count, p_gi_probe_cull_result, p_gi_probe_cull_count, p_lightmap_cull_result, p_lightmap_cull_count, p_environment, p_camera_effects, p_shadow_atlas, p_reflection_atlas, p_reflection_probe, p_reflection_probe_pass, clear_color, p_screen_lod_threshold);
 
 	if (p_render_buffers.is_valid()) {
 		RENDER_TIMESTAMP("Tonemap");
@@ -7082,7 +7089,7 @@ void RendererSceneRenderRD::render_scene(RID p_render_buffers, const Transform &
 	}
 }
 
-void RendererSceneRenderRD::render_shadow(RID p_light, RID p_shadow_atlas, int p_pass, InstanceBase **p_cull_result, int p_cull_count) {
+void RendererSceneRenderRD::render_shadow(RID p_light, RID p_shadow_atlas, int p_pass, InstanceBase **p_cull_result, int p_cull_count, const Plane &p_camera_plane, float p_lod_distance_multiplier, float p_screen_lod_threshold) {
 	LightInstance *light_instance = light_instance_owner.getornull(p_light);
 	ERR_FAIL_COND(!light_instance);
 
@@ -7233,7 +7240,7 @@ void RendererSceneRenderRD::render_shadow(RID p_light, RID p_shadow_atlas, int p
 
 	if (render_cubemap) {
 		//rendering to cubemap
-		_render_shadow(render_fb, p_cull_result, p_cull_count, light_projection, light_transform, zfar, 0, 0, false, false, use_pancake);
+		_render_shadow(render_fb, p_cull_result, p_cull_count, light_projection, light_transform, zfar, 0, 0, false, false, use_pancake, p_camera_plane, p_lod_distance_multiplier, p_screen_lod_threshold);
 		if (finalize_cubemap) {
 			//reblit
 			atlas_rect.size.height /= 2;
@@ -7244,7 +7251,7 @@ void RendererSceneRenderRD::render_shadow(RID p_light, RID p_shadow_atlas, int p
 	} else {
 		//render shadow
 
-		_render_shadow(render_fb, p_cull_result, p_cull_count, light_projection, light_transform, zfar, bias, normal_bias, using_dual_paraboloid, using_dual_paraboloid_flip, use_pancake);
+		_render_shadow(render_fb, p_cull_result, p_cull_count, light_projection, light_transform, zfar, bias, normal_bias, using_dual_paraboloid, using_dual_paraboloid_flip, use_pancake, p_camera_plane, p_lod_distance_multiplier, p_screen_lod_threshold);
 
 		//copy to atlas
 		if (use_linear_depth) {
diff --git a/servers/rendering/renderer_rd/renderer_scene_render_rd.h b/servers/rendering/renderer_rd/renderer_scene_render_rd.h
index e3dfee2da7..3afe6e3f4a 100644
--- a/servers/rendering/renderer_rd/renderer_scene_render_rd.h
+++ b/servers/rendering/renderer_rd/renderer_scene_render_rd.h
@@ -109,8 +109,8 @@ protected:
 	void _setup_reflections(RID *p_reflection_probe_cull_result, int p_reflection_probe_cull_count, const Transform &p_camera_inverse_transform, RID p_environment);
 	void _setup_giprobes(RID p_render_buffers, const Transform &p_transform, RID *p_gi_probe_cull_result, int p_gi_probe_cull_count, uint32_t &r_gi_probes_used);
 
-	virtual void _render_scene(RID p_render_buffer, const Transform &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_ortogonal, InstanceBase **p_cull_result, int p_cull_count, int p_directional_light_count, RID *p_gi_probe_cull_result, int p_gi_probe_cull_count, InstanceBase **p_lightmap_cull_result, int p_lightmap_cull_count, RID p_environment, RID p_camera_effects, RID p_shadow_atlas, RID p_reflection_atlas, RID p_reflection_probe, int p_reflection_probe_pass, const Color &p_default_color) = 0;
-	virtual void _render_shadow(RID p_framebuffer, InstanceBase **p_cull_result, int p_cull_count, const CameraMatrix &p_projection, const Transform &p_transform, float p_zfar, float p_bias, float p_normal_bias, bool p_use_dp, bool use_dp_flip, bool p_use_pancake) = 0;
+	virtual void _render_scene(RID p_render_buffer, const Transform &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_ortogonal, InstanceBase **p_cull_result, int p_cull_count, int p_directional_light_count, RID *p_gi_probe_cull_result, int p_gi_probe_cull_count, InstanceBase **p_lightmap_cull_result, int p_lightmap_cull_count, RID p_environment, RID p_camera_effects, RID p_shadow_atlas, RID p_reflection_atlas, RID p_reflection_probe, int p_reflection_probe_pass, const Color &p_default_color, float p_screen_lod_threshold) = 0;
+	virtual void _render_shadow(RID p_framebuffer, InstanceBase **p_cull_result, int p_cull_count, const CameraMatrix &p_projection, const Transform &p_transform, float p_zfar, float p_bias, float p_normal_bias, bool p_use_dp, bool use_dp_flip, bool p_use_pancake, const Plane &p_camera_plane = Plane(), float p_lod_distance_multiplier = 0.0, float p_screen_lod_threshold = 0.0) = 0;
 	virtual void _render_material(const Transform &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_ortogonal, InstanceBase **p_cull_result, int p_cull_count, RID p_framebuffer, const Rect2i &p_region) = 0;
 	virtual void _render_uv2(InstanceBase **p_cull_result, int p_cull_count, RID p_framebuffer, const Rect2i &p_region) = 0;
 	virtual void _render_sdfgi(RID p_render_buffers, const Vector3i &p_from, const Vector3i &p_size, const AABB &p_bounds, InstanceBase **p_cull_result, int p_cull_count, const RID &p_albedo_texture, const RID &p_emission_texture, const RID &p_emission_aniso_texture, const RID &p_geom_facing_texture) = 0;
@@ -339,7 +339,7 @@ private:
 		Vector<Reflection> reflections;
 	};
 
-	RID_Owner<ReflectionAtlas> reflection_atlas_owner;
+	mutable RID_Owner<ReflectionAtlas> reflection_atlas_owner;
 
 	/* REFLECTION PROBE INSTANCE */
 
@@ -1728,6 +1728,8 @@ public:
 
 	virtual RID reflection_atlas_create();
 	virtual void reflection_atlas_set_size(RID p_ref_atlas, int p_reflection_size, int p_reflection_count);
+	virtual int reflection_atlas_get_size(RID p_ref_atlas) const;
+
 	_FORCE_INLINE_ RID reflection_atlas_get_texture(RID p_ref_atlas) {
 		ReflectionAtlas *atlas = reflection_atlas_owner.getornull(p_ref_atlas);
 		ERR_FAIL_COND_V(!atlas, RID());
@@ -1884,9 +1886,9 @@ public:
 	float render_buffers_get_volumetric_fog_end(RID p_render_buffers);
 	float render_buffers_get_volumetric_fog_detail_spread(RID p_render_buffers);
 
-	void render_scene(RID p_render_buffers, const Transform &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_ortogonal, InstanceBase **p_cull_result, int p_cull_count, RID *p_light_cull_result, int p_light_cull_count, RID *p_reflection_probe_cull_result, int p_reflection_probe_cull_count, RID *p_gi_probe_cull_result, int p_gi_probe_cull_count, RID *p_decal_cull_result, int p_decal_cull_count, InstanceBase **p_lightmap_cull_result, int p_lightmap_cull_count, RID p_environment, RID p_shadow_atlas, RID p_camera_effects, RID p_reflection_atlas, RID p_reflection_probe, int p_reflection_probe_pass);
+	void render_scene(RID p_render_buffers, const Transform &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_ortogonal, InstanceBase **p_cull_result, int p_cull_count, RID *p_light_cull_result, int p_light_cull_count, RID *p_reflection_probe_cull_result, int p_reflection_probe_cull_count, RID *p_gi_probe_cull_result, int p_gi_probe_cull_count, RID *p_decal_cull_result, int p_decal_cull_count, InstanceBase **p_lightmap_cull_result, int p_lightmap_cull_count, RID p_environment, RID p_shadow_atlas, RID p_camera_effects, RID p_reflection_atlas, RID p_reflection_probe, int p_reflection_probe_pass, float p_screen_lod_threshold);
 
-	void render_shadow(RID p_light, RID p_shadow_atlas, int p_pass, InstanceBase **p_cull_result, int p_cull_count);
+	void render_shadow(RID p_light, RID p_shadow_atlas, int p_pass, InstanceBase **p_cull_result, int p_cull_count, const Plane &p_camera_plane = Plane(), float p_lod_distance_multiplier = 0, float p_screen_lod_threshold = 0.0);
 
 	void render_material(const Transform &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_ortogonal, InstanceBase **p_cull_result, int p_cull_count, RID p_framebuffer, const Rect2i &p_region);
 
diff --git a/servers/rendering/renderer_rd/renderer_storage_rd.cpp b/servers/rendering/renderer_rd/renderer_storage_rd.cpp
index 286281c83d..348f5c121e 100644
--- a/servers/rendering/renderer_rd/renderer_storage_rd.cpp
+++ b/servers/rendering/renderer_rd/renderer_storage_rd.cpp
@@ -5645,6 +5645,15 @@ void RendererStorageRD::reflection_probe_set_resolution(RID p_probe, int p_resol
 	reflection_probe->resolution = p_resolution;
 }
 
+void RendererStorageRD::reflection_probe_set_lod_threshold(RID p_probe, float p_ratio) {
+	ReflectionProbe *reflection_probe = reflection_probe_owner.getornull(p_probe);
+	ERR_FAIL_COND(!reflection_probe);
+
+	reflection_probe->lod_threshold = p_ratio;
+
+	reflection_probe->instance_dependency.instance_notify_changed(true, false);
+}
+
 AABB RendererStorageRD::reflection_probe_get_aabb(RID p_probe) const {
 	const ReflectionProbe *reflection_probe = reflection_probe_owner.getornull(p_probe);
 	ERR_FAIL_COND_V(!reflection_probe, AABB());
@@ -5698,6 +5707,13 @@ float RendererStorageRD::reflection_probe_get_origin_max_distance(RID p_probe) c
 	return reflection_probe->max_distance;
 }
 
+float RendererStorageRD::reflection_probe_get_lod_threshold(RID p_probe) const {
+	const ReflectionProbe *reflection_probe = reflection_probe_owner.getornull(p_probe);
+	ERR_FAIL_COND_V(!reflection_probe, 0);
+
+	return reflection_probe->lod_threshold;
+}
+
 int RendererStorageRD::reflection_probe_get_resolution(RID p_probe) const {
 	const ReflectionProbe *reflection_probe = reflection_probe_owner.getornull(p_probe);
 	ERR_FAIL_COND_V(!reflection_probe, 0);
diff --git a/servers/rendering/renderer_rd/renderer_storage_rd.h b/servers/rendering/renderer_rd/renderer_storage_rd.h
index ee4cf6da1a..e4199ffd12 100644
--- a/servers/rendering/renderer_rd/renderer_storage_rd.h
+++ b/servers/rendering/renderer_rd/renderer_storage_rd.h
@@ -964,6 +964,7 @@ private:
 		bool box_projection = false;
 		bool enable_shadows = false;
 		uint32_t cull_mask = (1 << 20) - 1;
+		float lod_threshold = 0.01;
 
 		RendererStorage::InstanceDependency instance_dependency;
 	};
@@ -1417,22 +1418,50 @@ public:
 		return mesh->material_cache.ptr();
 	}
 
-	_FORCE_INLINE_ RS::PrimitiveType mesh_surface_get_primitive(RID p_mesh, uint32_t p_surface_index) {
+	_FORCE_INLINE_ void *mesh_get_surface(RID p_mesh, uint32_t p_surface_index) {
 		Mesh *mesh = mesh_owner.getornull(p_mesh);
-		ERR_FAIL_COND_V(!mesh, RS::PRIMITIVE_MAX);
-		ERR_FAIL_UNSIGNED_INDEX_V(p_surface_index, mesh->surface_count, RS::PRIMITIVE_MAX);
+		ERR_FAIL_COND_V(!mesh, nullptr);
+		ERR_FAIL_UNSIGNED_INDEX_V(p_surface_index, mesh->surface_count, nullptr);
 
-		return mesh->surfaces[p_surface_index]->primitive;
+		return mesh->surfaces[p_surface_index];
 	}
 
-	_FORCE_INLINE_ void mesh_surface_get_arrays_and_format(RID p_mesh, uint32_t p_surface_index, uint32_t p_input_mask, RID &r_vertex_array_rd, RID &r_index_array_rd, RD::VertexFormatID &r_vertex_format) {
-		Mesh *mesh = mesh_owner.getornull(p_mesh);
-		ERR_FAIL_COND(!mesh);
-		ERR_FAIL_UNSIGNED_INDEX(p_surface_index, mesh->surface_count);
+	_FORCE_INLINE_ RS::PrimitiveType mesh_surface_get_primitive(void *p_surface) {
+		Mesh::Surface *surface = reinterpret_cast<Mesh::Surface *>(p_surface);
+		return surface->primitive;
+	}
 
-		Mesh::Surface *s = mesh->surfaces[p_surface_index];
+	_FORCE_INLINE_ bool mesh_surface_has_lod(void *p_surface) const {
+		Mesh::Surface *s = reinterpret_cast<Mesh::Surface *>(p_surface);
+		return s->lod_count > 0;
+	}
+
+	_FORCE_INLINE_ RID mesh_surface_get_index_array(void *p_surface) const {
+		Mesh::Surface *s = reinterpret_cast<Mesh::Surface *>(p_surface);
+
+		return s->index_array;
+	}
 
-		r_index_array_rd = s->index_array;
+	_FORCE_INLINE_ RID mesh_surface_get_index_array_with_lod(void *p_surface, float p_model_scale, float p_distance_threshold, float p_lod_threshold) const {
+		Mesh::Surface *s = reinterpret_cast<Mesh::Surface *>(p_surface);
+
+		int32_t current_lod = -1;
+		for (uint32_t i = 0; i < s->lod_count; i++) {
+			float screen_size = s->lods[i].edge_length * p_model_scale / p_distance_threshold;
+			if (screen_size > p_lod_threshold) {
+				break;
+			}
+			current_lod = i;
+		}
+		if (current_lod == -1) {
+			return s->index_array;
+		} else {
+			return s->lods[current_lod].index_array;
+		}
+	}
+
+	_FORCE_INLINE_ void mesh_surface_get_vertex_arrays_and_format(void *p_surface, uint32_t p_input_mask, RID &r_vertex_array_rd, RD::VertexFormatID &r_vertex_format) {
+		Mesh::Surface *s = reinterpret_cast<Mesh::Surface *>(p_surface);
 
 		s->version_lock.lock();
 
@@ -1461,7 +1490,7 @@ public:
 		s->version_lock.unlock();
 	}
 
-	_FORCE_INLINE_ void mesh_instance_surface_get_arrays_and_format(RID p_mesh_instance, uint32_t p_surface_index, uint32_t p_input_mask, RID &r_vertex_array_rd, RID &r_index_array_rd, RD::VertexFormatID &r_vertex_format) {
+	_FORCE_INLINE_ void mesh_instance_surface_get_vertex_arrays_and_format(RID p_mesh_instance, uint32_t p_surface_index, uint32_t p_input_mask, RID &r_vertex_array_rd, RD::VertexFormatID &r_vertex_format) {
 		MeshInstance *mi = mesh_instance_owner.getornull(p_mesh_instance);
 		ERR_FAIL_COND(!mi);
 		Mesh *mesh = mi->mesh;
@@ -1470,8 +1499,6 @@ public:
 		MeshInstance::Surface *mis = &mi->surfaces[p_surface_index];
 		Mesh::Surface *s = mesh->surfaces[p_surface_index];
 
-		r_index_array_rd = s->index_array;
-
 		s->version_lock.lock();
 
 		//there will never be more than, at much, 3 or 4 versions, so iterating is the fastest way
@@ -1780,6 +1807,7 @@ public:
 	void reflection_probe_set_enable_shadows(RID p_probe, bool p_enable);
 	void reflection_probe_set_cull_mask(RID p_probe, uint32_t p_layers);
 	void reflection_probe_set_resolution(RID p_probe, int p_resolution);
+	void reflection_probe_set_lod_threshold(RID p_probe, float p_ratio);
 
 	AABB reflection_probe_get_aabb(RID p_probe) const;
 	RS::ReflectionProbeUpdateMode reflection_probe_get_update_mode(RID p_probe) const;
@@ -1787,6 +1815,8 @@ public:
 	Vector3 reflection_probe_get_extents(RID p_probe) const;
 	Vector3 reflection_probe_get_origin_offset(RID p_probe) const;
 	float reflection_probe_get_origin_max_distance(RID p_probe) const;
+	float reflection_probe_get_lod_threshold(RID p_probe) const;
+
 	int reflection_probe_get_resolution(RID p_probe) const;
 	bool reflection_probe_renders_shadows(RID p_probe) const;
 
diff --git a/servers/rendering/renderer_scene.h b/servers/rendering/renderer_scene.h
index 3da08f10af..56c38beaa3 100644
--- a/servers/rendering/renderer_scene.h
+++ b/servers/rendering/renderer_scene.h
@@ -88,6 +88,7 @@ public:
 	virtual void instance_geometry_set_draw_range(RID p_instance, float p_min, float p_max, float p_min_margin, float p_max_margin) = 0;
 	virtual void instance_geometry_set_as_instance_lod(RID p_instance, RID p_as_lod_of_instance) = 0;
 	virtual void instance_geometry_set_lightmap(RID p_instance, RID p_lightmap, const Rect2 &p_lightmap_uv_scale, int p_slice_index) = 0;
+	virtual void instance_geometry_set_lod_bias(RID p_instance, float p_lod_bias) = 0;
 
 	virtual void instance_geometry_set_shader_parameter(RID p_instance, const StringName &p_parameter, const Variant &p_value) = 0;
 	virtual void instance_geometry_get_shader_parameter_list(RID p_instance, List<PropertyInfo> *p_parameters) const = 0;
@@ -187,8 +188,8 @@ public:
 	virtual void sdfgi_set_debug_probe_select(const Vector3 &p_position, const Vector3 &p_dir) = 0;
 
 	virtual void render_empty_scene(RID p_render_buffers, RID p_scenario, RID p_shadow_atlas) = 0;
-	virtual void render_camera(RID p_render_buffers, RID p_camera, RID p_scenario, Size2 p_viewport_size, RID p_shadow_atlas) = 0;
-	virtual void render_camera(RID p_render_buffers, Ref<XRInterface> &p_interface, XRInterface::Eyes p_eye, RID p_camera, RID p_scenario, Size2 p_viewport_size, RID p_shadow_atlas) = 0;
+	virtual void render_camera(RID p_render_buffers, RID p_camera, RID p_scenario, Size2 p_viewport_size, float p_lod_threshold, RID p_shadow_atlas) = 0;
+	virtual void render_camera(RID p_render_buffers, Ref<XRInterface> &p_interface, XRInterface::Eyes p_eye, RID p_camera, RID p_scenario, Size2 p_viewport_size, float p_lod_threshold, RID p_shadow_atlas) = 0;
 
 	virtual void update() = 0;
 	virtual void render_probes() = 0;
diff --git a/servers/rendering/renderer_scene_cull.cpp b/servers/rendering/renderer_scene_cull.cpp
index c63152c11e..88a0859a28 100644
--- a/servers/rendering/renderer_scene_cull.cpp
+++ b/servers/rendering/renderer_scene_cull.cpp
@@ -969,6 +969,13 @@ void RendererSceneCull::instance_geometry_set_lightmap(RID p_instance, RID p_lig
 	}
 }
 
+void RendererSceneCull::instance_geometry_set_lod_bias(RID p_instance, float p_lod_bias) {
+	Instance *instance = instance_owner.getornull(p_instance);
+	ERR_FAIL_COND(!instance);
+
+	instance->lod_bias = p_lod_bias;
+}
+
 void RendererSceneCull::instance_geometry_set_shader_parameter(RID p_instance, const StringName &p_parameter, const Variant &p_value) {
 	Instance *instance = instance_owner.getornull(p_instance);
 	ERR_FAIL_COND(!instance);
@@ -1325,7 +1332,7 @@ void RendererSceneCull::_update_instance_lightmap_captures(Instance *p_instance)
 	}
 }
 
-bool RendererSceneCull::_light_instance_update_shadow(Instance *p_instance, const Transform p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_orthogonal, bool p_cam_vaspect, RID p_shadow_atlas, Scenario *p_scenario) {
+bool RendererSceneCull::_light_instance_update_shadow(Instance *p_instance, const Transform p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_orthogonal, bool p_cam_vaspect, RID p_shadow_atlas, Scenario *p_scenario, float p_screen_lod_threshold) {
 	InstanceLightData *light = static_cast<InstanceLightData *>(p_instance->base_data);
 
 	Transform light_transform = p_instance->transform;
@@ -1335,6 +1342,8 @@ bool RendererSceneCull::_light_instance_update_shadow(Instance *p_instance, cons
 
 	switch (RSG::storage->light_get_type(p_instance->base)) {
 		case RS::LIGHT_DIRECTIONAL: {
+			Plane camera_plane(p_cam_transform.get_origin(), -p_cam_transform.basis.get_axis(Vector3::AXIS_Z));
+
 			real_t max_distance = p_cam_projection.get_z_far();
 			real_t shadow_max = RSG::storage->light_get_param(p_instance->base, RS::LIGHT_PARAM_SHADOW_MAX_DISTANCE);
 			if (shadow_max > 0 && !p_cam_orthogonal) { //its impractical (and leads to unwanted behaviors) to set max distance in orthogonal camera
@@ -1703,7 +1712,7 @@ bool RendererSceneCull::_light_instance_update_shadow(Instance *p_instance, cons
 
 				RSG::storage->update_mesh_instances();
 
-				scene_render->render_shadow(light->instance, p_shadow_atlas, i, (RendererSceneRender::InstanceBase **)instance_shadow_cull_result, cull_count);
+				scene_render->render_shadow(light->instance, p_shadow_atlas, i, (RendererSceneRender::InstanceBase **)instance_shadow_cull_result, cull_count, camera_plane, p_cam_projection.get_lod_multiplier(), p_screen_lod_threshold);
 			}
 
 		} break;
@@ -1860,7 +1869,7 @@ bool RendererSceneCull::_light_instance_update_shadow(Instance *p_instance, cons
 	return animated_material_found;
 }
 
-void RendererSceneCull::render_camera(RID p_render_buffers, RID p_camera, RID p_scenario, Size2 p_viewport_size, RID p_shadow_atlas) {
+void RendererSceneCull::render_camera(RID p_render_buffers, RID p_camera, RID p_scenario, Size2 p_viewport_size, float p_screen_lod_threshold, RID p_shadow_atlas) {
 // render to mono camera
 #ifndef _3D_DISABLED
 
@@ -1905,12 +1914,12 @@ void RendererSceneCull::render_camera(RID p_render_buffers, RID p_camera, RID p_
 
 	RID environment = _render_get_environment(p_camera, p_scenario);
 
-	_prepare_scene(camera->transform, camera_matrix, ortho, camera->vaspect, p_render_buffers, environment, camera->visible_layers, p_scenario, p_shadow_atlas, RID());
-	_render_scene(p_render_buffers, camera->transform, camera_matrix, ortho, environment, camera->effects, p_scenario, p_shadow_atlas, RID(), -1);
+	_prepare_scene(camera->transform, camera_matrix, ortho, camera->vaspect, p_render_buffers, environment, camera->visible_layers, p_scenario, p_shadow_atlas, RID(), p_screen_lod_threshold);
+	_render_scene(p_render_buffers, camera->transform, camera_matrix, ortho, environment, camera->effects, p_scenario, p_shadow_atlas, RID(), -1, p_screen_lod_threshold);
 #endif
 }
 
-void RendererSceneCull::render_camera(RID p_render_buffers, Ref<XRInterface> &p_interface, XRInterface::Eyes p_eye, RID p_camera, RID p_scenario, Size2 p_viewport_size, RID p_shadow_atlas) {
+void RendererSceneCull::render_camera(RID p_render_buffers, Ref<XRInterface> &p_interface, XRInterface::Eyes p_eye, RID p_camera, RID p_scenario, Size2 p_viewport_size, float p_screen_lod_threshold, RID p_shadow_atlas) {
 	// render for AR/VR interface
 
 	Camera *camera = camera_owner.getornull(p_camera);
@@ -1984,17 +1993,17 @@ void RendererSceneCull::render_camera(RID p_render_buffers, Ref<XRInterface> &p_
 		mono_transform *= apply_z_shift;
 
 		// now prepare our scene with our adjusted transform projection matrix
-		_prepare_scene(mono_transform, combined_matrix, false, false, p_render_buffers, environment, camera->visible_layers, p_scenario, p_shadow_atlas, RID());
+		_prepare_scene(mono_transform, combined_matrix, false, false, p_render_buffers, environment, camera->visible_layers, p_scenario, p_shadow_atlas, RID(), p_screen_lod_threshold);
 	} else if (p_eye == XRInterface::EYE_MONO) {
 		// For mono render, prepare as per usual
-		_prepare_scene(cam_transform, camera_matrix, false, false, p_render_buffers, environment, camera->visible_layers, p_scenario, p_shadow_atlas, RID());
+		_prepare_scene(cam_transform, camera_matrix, false, false, p_render_buffers, environment, camera->visible_layers, p_scenario, p_shadow_atlas, RID(), p_screen_lod_threshold);
 	}
 
 	// And render our scene...
-	_render_scene(p_render_buffers, cam_transform, camera_matrix, false, environment, camera->effects, p_scenario, p_shadow_atlas, RID(), -1);
+	_render_scene(p_render_buffers, cam_transform, camera_matrix, false, environment, camera->effects, p_scenario, p_shadow_atlas, RID(), -1, p_screen_lod_threshold);
 };
 
-void RendererSceneCull::_prepare_scene(const Transform p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_orthogonal, bool p_cam_vaspect, RID p_render_buffers, RID p_environment, uint32_t p_visible_layers, RID p_scenario, RID p_shadow_atlas, RID p_reflection_probe, bool p_using_shadows) {
+void RendererSceneCull::_prepare_scene(const Transform p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_orthogonal, bool p_cam_vaspect, RID p_render_buffers, RID p_environment, uint32_t p_visible_layers, RID p_scenario, RID p_shadow_atlas, RID p_reflection_probe, float p_screen_lod_threshold, bool p_using_shadows) {
 	// Note, in stereo rendering:
 	// - p_cam_transform will be a transform in the middle of our two eyes
 	// - p_cam_projection is a wider frustrum that encompasses both eyes
@@ -2250,7 +2259,7 @@ void RendererSceneCull::_prepare_scene(const Transform p_cam_transform, const Ca
 		for (int i = 0; i < directional_shadow_count; i++) {
 			RENDER_TIMESTAMP(">Rendering Directional Light " + itos(i));
 
-			_light_instance_update_shadow(lights_with_shadow[i], p_cam_transform, p_cam_projection, p_cam_orthogonal, p_cam_vaspect, p_shadow_atlas, scenario);
+			_light_instance_update_shadow(lights_with_shadow[i], p_cam_transform, p_cam_projection, p_cam_orthogonal, p_cam_vaspect, p_shadow_atlas, scenario, p_screen_lod_threshold);
 
 			RENDER_TIMESTAMP("<Rendering Directional Light " + itos(i));
 		}
@@ -2349,7 +2358,7 @@ void RendererSceneCull::_prepare_scene(const Transform p_cam_transform, const Ca
 			if (redraw) {
 				//must redraw!
 				RENDER_TIMESTAMP(">Rendering Light " + itos(i));
-				light->shadow_dirty = _light_instance_update_shadow(ins, p_cam_transform, p_cam_projection, p_cam_orthogonal, p_cam_vaspect, p_shadow_atlas, scenario);
+				light->shadow_dirty = _light_instance_update_shadow(ins, p_cam_transform, p_cam_projection, p_cam_orthogonal, p_cam_vaspect, p_shadow_atlas, scenario, p_screen_lod_threshold);
 				RENDER_TIMESTAMP("<Rendering Light " + itos(i));
 			}
 		}
@@ -2447,7 +2456,7 @@ RID RendererSceneCull::_render_get_environment(RID p_camera, RID p_scenario) {
 	return RID();
 }
 
-void RendererSceneCull::_render_scene(RID p_render_buffers, const Transform p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_orthogonal, RID p_environment, RID p_force_camera_effects, RID p_scenario, RID p_shadow_atlas, RID p_reflection_probe, int p_reflection_probe_pass) {
+void RendererSceneCull::_render_scene(RID p_render_buffers, const Transform p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_orthogonal, RID p_environment, RID p_force_camera_effects, RID p_scenario, RID p_shadow_atlas, RID p_reflection_probe, int p_reflection_probe_pass, float p_screen_lod_threshold) {
 	Scenario *scenario = scenario_owner.getornull(p_scenario);
 
 	RID camera_effects;
@@ -2459,7 +2468,7 @@ void RendererSceneCull::_render_scene(RID p_render_buffers, const Transform p_ca
 	/* PROCESS GEOMETRY AND DRAW SCENE */
 
 	RENDER_TIMESTAMP("Render Scene ");
-	scene_render->render_scene(p_render_buffers, p_cam_transform, p_cam_projection, p_cam_orthogonal, (RendererSceneRender::InstanceBase **)instance_cull_result, instance_cull_count, light_instance_cull_result, light_cull_count + directional_light_count, reflection_probe_instance_cull_result, reflection_probe_cull_count, gi_probe_instance_cull_result, gi_probe_cull_count, decal_instance_cull_result, decal_cull_count, (RendererSceneRender::InstanceBase **)lightmap_cull_result, lightmap_cull_count, p_environment, camera_effects, p_shadow_atlas, p_reflection_probe.is_valid() ? RID() : scenario->reflection_atlas, p_reflection_probe, p_reflection_probe_pass);
+	scene_render->render_scene(p_render_buffers, p_cam_transform, p_cam_projection, p_cam_orthogonal, (RendererSceneRender::InstanceBase **)instance_cull_result, instance_cull_count, light_instance_cull_result, light_cull_count + directional_light_count, reflection_probe_instance_cull_result, reflection_probe_cull_count, gi_probe_instance_cull_result, gi_probe_cull_count, decal_instance_cull_result, decal_cull_count, (RendererSceneRender::InstanceBase **)lightmap_cull_result, lightmap_cull_count, p_environment, camera_effects, p_shadow_atlas, p_reflection_probe.is_valid() ? RID() : scenario->reflection_atlas, p_reflection_probe, p_reflection_probe_pass, p_screen_lod_threshold);
 }
 
 void RendererSceneCull::render_empty_scene(RID p_render_buffers, RID p_scenario, RID p_shadow_atlas) {
@@ -2474,7 +2483,7 @@ void RendererSceneCull::render_empty_scene(RID p_render_buffers, RID p_scenario,
 		environment = scenario->fallback_environment;
 	}
 	RENDER_TIMESTAMP("Render Empty Scene ");
-	scene_render->render_scene(p_render_buffers, Transform(), CameraMatrix(), true, nullptr, 0, nullptr, 0, nullptr, 0, nullptr, 0, nullptr, 0, nullptr, 0, environment, RID(), p_shadow_atlas, scenario->reflection_atlas, RID(), 0);
+	scene_render->render_scene(p_render_buffers, Transform(), CameraMatrix(), true, nullptr, 0, nullptr, 0, nullptr, 0, nullptr, 0, nullptr, 0, nullptr, 0, environment, RID(), p_shadow_atlas, scenario->reflection_atlas, RID(), 0, 0);
 #endif
 }
 
@@ -2512,6 +2521,8 @@ bool RendererSceneCull::_render_reflection_probe_step(Instance *p_instance, int
 		Vector3 extents = RSG::storage->reflection_probe_get_extents(p_instance->base);
 		Vector3 origin_offset = RSG::storage->reflection_probe_get_origin_offset(p_instance->base);
 		float max_distance = RSG::storage->reflection_probe_get_origin_max_distance(p_instance->base);
+		float size = scene_render->reflection_atlas_get_size(scenario->reflection_atlas);
+		float lod_threshold = RSG::storage->reflection_probe_get_lod_threshold(p_instance->base) / size;
 
 		Vector3 edge = view_normals[p_step] * extents;
 		float distance = ABS(view_normals[p_step].dot(edge) - view_normals[p_step].dot(origin_offset)); //distance from origin offset to actual view distance limit
@@ -2535,8 +2546,8 @@ bool RendererSceneCull::_render_reflection_probe_step(Instance *p_instance, int
 		}
 
 		RENDER_TIMESTAMP("Render Reflection Probe, Step " + itos(p_step));
-		_prepare_scene(xform, cm, false, false, RID(), RID(), RSG::storage->reflection_probe_get_cull_mask(p_instance->base), p_instance->scenario->self, shadow_atlas, reflection_probe->instance, use_shadows);
-		_render_scene(RID(), xform, cm, false, RID(), RID(), p_instance->scenario->self, shadow_atlas, reflection_probe->instance, p_step);
+		_prepare_scene(xform, cm, false, false, RID(), RID(), RSG::storage->reflection_probe_get_cull_mask(p_instance->base), p_instance->scenario->self, shadow_atlas, reflection_probe->instance, lod_threshold, use_shadows);
+		_render_scene(RID(), xform, cm, false, RID(), RID(), p_instance->scenario->self, shadow_atlas, reflection_probe->instance, p_step, lod_threshold);
 
 	} else {
 		//do roughness postprocess step until it believes it's done
diff --git a/servers/rendering/renderer_scene_cull.h b/servers/rendering/renderer_scene_cull.h
index c4379e4560..3bbe16e4e8 100644
--- a/servers/rendering/renderer_scene_cull.h
+++ b/servers/rendering/renderer_scene_cull.h
@@ -447,6 +447,7 @@ public:
 	virtual void instance_geometry_set_draw_range(RID p_instance, float p_min, float p_max, float p_min_margin, float p_max_margin);
 	virtual void instance_geometry_set_as_instance_lod(RID p_instance, RID p_as_lod_of_instance);
 	virtual void instance_geometry_set_lightmap(RID p_instance, RID p_lightmap, const Rect2 &p_lightmap_uv_scale, int p_slice_index);
+	virtual void instance_geometry_set_lod_bias(RID p_instance, float p_lod_bias);
 
 	void _update_instance_shader_parameters_from_material(Map<StringName, RendererSceneRender::InstanceBase::InstanceShaderParameter> &isparams, const Map<StringName, RendererSceneRender::InstanceBase::InstanceShaderParameter> &existing_isparams, RID p_material);
 
@@ -460,17 +461,17 @@ public:
 	_FORCE_INLINE_ void _update_dirty_instance(Instance *p_instance);
 	_FORCE_INLINE_ void _update_instance_lightmap_captures(Instance *p_instance);
 
-	_FORCE_INLINE_ bool _light_instance_update_shadow(Instance *p_instance, const Transform p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_orthogonal, bool p_cam_vaspect, RID p_shadow_atlas, Scenario *p_scenario);
+	_FORCE_INLINE_ bool _light_instance_update_shadow(Instance *p_instance, const Transform p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_orthogonal, bool p_cam_vaspect, RID p_shadow_atlas, Scenario *p_scenario, float p_scren_lod_threshold);
 
 	RID _render_get_environment(RID p_camera, RID p_scenario);
 
 	bool _render_reflection_probe_step(Instance *p_instance, int p_step);
-	void _prepare_scene(const Transform p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_orthogonal, bool p_cam_vaspect, RID p_render_buffers, RID p_environment, uint32_t p_visible_layers, RID p_scenario, RID p_shadow_atlas, RID p_reflection_probe, bool p_using_shadows = true);
-	void _render_scene(RID p_render_buffers, const Transform p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_orthogonal, RID p_environment, RID p_force_camera_effects, RID p_scenario, RID p_shadow_atlas, RID p_reflection_probe, int p_reflection_probe_pass);
+	void _prepare_scene(const Transform p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_orthogonal, bool p_cam_vaspect, RID p_render_buffers, RID p_environment, uint32_t p_visible_layers, RID p_scenario, RID p_shadow_atlas, RID p_reflection_probe, float p_screen_lod_threshold, bool p_using_shadows = true);
+	void _render_scene(RID p_render_buffers, const Transform p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_orthogonal, RID p_environment, RID p_force_camera_effects, RID p_scenario, RID p_shadow_atlas, RID p_reflection_probe, int p_reflection_probe_pass, float p_screen_lod_threshold);
 	void render_empty_scene(RID p_render_buffers, RID p_scenario, RID p_shadow_atlas);
 
-	void render_camera(RID p_render_buffers, RID p_camera, RID p_scenario, Size2 p_viewport_size, RID p_shadow_atlas);
-	void render_camera(RID p_render_buffers, Ref<XRInterface> &p_interface, XRInterface::Eyes p_eye, RID p_camera, RID p_scenario, Size2 p_viewport_size, RID p_shadow_atlas);
+	void render_camera(RID p_render_buffers, RID p_camera, RID p_scenario, Size2 p_viewport_size, float p_screen_lod_threshold, RID p_shadow_atlas);
+	void render_camera(RID p_render_buffers, Ref<XRInterface> &p_interface, XRInterface::Eyes p_eye, RID p_camera, RID p_scenario, Size2 p_viewport_size, float p_screen_lod_threshold, RID p_shadow_atlas);
 	void update_dirty_instances();
 
 	void render_particle_colliders();
diff --git a/servers/rendering/renderer_scene_render.h b/servers/rendering/renderer_scene_render.h
index 5690988297..e1f3ea9b6b 100644
--- a/servers/rendering/renderer_scene_render.h
+++ b/servers/rendering/renderer_scene_render.h
@@ -139,6 +139,8 @@ public:
 
 		Transform transform;
 
+		float lod_bias;
+
 		int depth_layer;
 		uint32_t layer_mask;
 
@@ -195,6 +197,7 @@ public:
 			lightmap_slice_index = 0;
 			lightmap = nullptr;
 			lightmap_cull_index = 0;
+			lod_bias = 1.0;
 		}
 
 		virtual ~InstanceBase() {
@@ -212,6 +215,7 @@ public:
 
 	virtual RID reflection_atlas_create() = 0;
 	virtual void reflection_atlas_set_size(RID p_ref_atlas, int p_reflection_size, int p_reflection_count) = 0;
+	virtual int reflection_atlas_get_size(RID p_ref_atlas) const = 0;
 
 	virtual RID reflection_probe_instance_create(RID p_probe) = 0;
 	virtual void reflection_probe_instance_set_transform(RID p_instance, const Transform &p_transform) = 0;
@@ -231,9 +235,9 @@ public:
 
 	virtual void gi_probe_set_quality(RS::GIProbeQuality) = 0;
 
-	virtual void render_scene(RID p_render_buffers, const Transform &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_ortogonal, InstanceBase **p_cull_result, int p_cull_count, RID *p_light_cull_result, int p_light_cull_count, RID *p_reflection_probe_cull_result, int p_reflection_probe_cull_count, RID *p_gi_probe_cull_result, int p_gi_probe_cull_count, RID *p_decal_cull_result, int p_decal_cull_count, InstanceBase **p_lightmap_cull_result, int p_lightmap_cull_count, RID p_environment, RID p_camera_effects, RID p_shadow_atlas, RID p_reflection_atlas, RID p_reflection_probe, int p_reflection_probe_pass) = 0;
+	virtual void render_scene(RID p_render_buffers, const Transform &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_ortogonal, InstanceBase **p_cull_result, int p_cull_count, RID *p_light_cull_result, int p_light_cull_count, RID *p_reflection_probe_cull_result, int p_reflection_probe_cull_count, RID *p_gi_probe_cull_result, int p_gi_probe_cull_count, RID *p_decal_cull_result, int p_decal_cull_count, InstanceBase **p_lightmap_cull_result, int p_lightmap_cull_count, RID p_environment, RID p_camera_effects, RID p_shadow_atlas, RID p_reflection_atlas, RID p_reflection_probe, int p_reflection_probe_pass, float p_screen_lod_threshold) = 0;
 
-	virtual void render_shadow(RID p_light, RID p_shadow_atlas, int p_pass, InstanceBase **p_cull_result, int p_cull_count) = 0;
+	virtual void render_shadow(RID p_light, RID p_shadow_atlas, int p_pass, InstanceBase **p_cull_result, int p_cull_count, const Plane &p_camera_plane = Plane(), float p_lod_distance_multiplier = 0, float p_screen_lod_threshold = 0.0) = 0;
 	virtual void render_material(const Transform &p_cam_transform, const CameraMatrix &p_cam_projection, bool p_cam_ortogonal, InstanceBase **p_cull_result, int p_cull_count, RID p_framebuffer, const Rect2i &p_region) = 0;
 	virtual void render_sdfgi(RID p_render_buffers, int p_region, InstanceBase **p_cull_result, int p_cull_count) = 0;
 	virtual void render_sdfgi_static_lights(RID p_render_buffers, uint32_t p_cascade_count, const uint32_t *p_cascade_indices, const RID **p_positional_light_cull_result, const uint32_t *p_positional_light_cull_count) = 0;
diff --git a/servers/rendering/renderer_storage.h b/servers/rendering/renderer_storage.h
index 2dbef2fcc6..895a7a5be8 100644
--- a/servers/rendering/renderer_storage.h
+++ b/servers/rendering/renderer_storage.h
@@ -338,6 +338,7 @@ public:
 	virtual void reflection_probe_set_enable_box_projection(RID p_probe, bool p_enable) = 0;
 	virtual void reflection_probe_set_enable_shadows(RID p_probe, bool p_enable) = 0;
 	virtual void reflection_probe_set_cull_mask(RID p_probe, uint32_t p_layers) = 0;
+	virtual void reflection_probe_set_lod_threshold(RID p_probe, float p_ratio) = 0;
 
 	virtual AABB reflection_probe_get_aabb(RID p_probe) const = 0;
 	virtual RS::ReflectionProbeUpdateMode reflection_probe_get_update_mode(RID p_probe) const = 0;
@@ -346,6 +347,7 @@ public:
 	virtual Vector3 reflection_probe_get_origin_offset(RID p_probe) const = 0;
 	virtual float reflection_probe_get_origin_max_distance(RID p_probe) const = 0;
 	virtual bool reflection_probe_renders_shadows(RID p_probe) const = 0;
+	virtual float reflection_probe_get_lod_threshold(RID p_probe) const = 0;
 
 	virtual void base_update_dependency(RID p_base, InstanceBaseDependency *p_instance) = 0;
 	virtual void skeleton_update_dependency(RID p_base, InstanceBaseDependency *p_instance) = 0;
diff --git a/servers/rendering/renderer_viewport.cpp b/servers/rendering/renderer_viewport.cpp
index 86bfda056b..ea95eb1189 100644
--- a/servers/rendering/renderer_viewport.cpp
+++ b/servers/rendering/renderer_viewport.cpp
@@ -79,10 +79,11 @@ void RendererViewport::_draw_3d(Viewport *p_viewport, XRInterface::Eyes p_eye) {
 		xr_interface = XRServer::get_singleton()->get_primary_interface();
 	}
 
+	float screen_lod_threshold = p_viewport->lod_threshold / float(p_viewport->size.width);
 	if (p_viewport->use_xr && xr_interface.is_valid()) {
-		RSG::scene->render_camera(p_viewport->render_buffers, xr_interface, p_eye, p_viewport->camera, p_viewport->scenario, p_viewport->size, p_viewport->shadow_atlas);
+		RSG::scene->render_camera(p_viewport->render_buffers, xr_interface, p_eye, p_viewport->camera, p_viewport->scenario, p_viewport->size, screen_lod_threshold, p_viewport->shadow_atlas);
 	} else {
-		RSG::scene->render_camera(p_viewport->render_buffers, p_viewport->camera, p_viewport->scenario, p_viewport->size, p_viewport->shadow_atlas);
+		RSG::scene->render_camera(p_viewport->render_buffers, p_viewport->camera, p_viewport->scenario, p_viewport->size, screen_lod_threshold, p_viewport->shadow_atlas);
 	}
 	RENDER_TIMESTAMP("<End Rendering 3D Scene");
 }
@@ -885,6 +886,13 @@ void RendererViewport::viewport_set_use_debanding(RID p_viewport, bool p_use_deb
 	}
 }
 
+void RendererViewport::viewport_set_lod_threshold(RID p_viewport, float p_pixels) {
+	Viewport *viewport = viewport_owner.getornull(p_viewport);
+	ERR_FAIL_COND(!viewport);
+
+	viewport->lod_threshold = p_pixels;
+}
+
 int RendererViewport::viewport_get_render_info(RID p_viewport, RS::ViewportRenderInfo p_info) {
 	ERR_FAIL_INDEX_V(p_info, RS::VIEWPORT_RENDER_INFO_MAX, -1);
 
diff --git a/servers/rendering/renderer_viewport.h b/servers/rendering/renderer_viewport.h
index 6634ef66e2..e836d05dfc 100644
--- a/servers/rendering/renderer_viewport.h
+++ b/servers/rendering/renderer_viewport.h
@@ -84,6 +84,8 @@ public:
 
 		bool sdf_active;
 
+		float lod_threshold = 1.0;
+
 		uint64_t last_pass = 0;
 
 		int render_info[RS::VIEWPORT_RENDER_INFO_MAX];
@@ -222,6 +224,8 @@ public:
 	void viewport_set_screen_space_aa(RID p_viewport, RS::ViewportScreenSpaceAA p_mode);
 	void viewport_set_use_debanding(RID p_viewport, bool p_use_debanding);
 
+	void viewport_set_lod_threshold(RID p_viewport, float p_pixels);
+
 	virtual int viewport_get_render_info(RID p_viewport, RS::ViewportRenderInfo p_info);
 	virtual void viewport_set_debug_draw(RID p_viewport, RS::ViewportDebugDraw p_draw);
 
diff --git a/servers/rendering/rendering_server_default.h b/servers/rendering/rendering_server_default.h
index 97c3aeaf45..dd1a41a4f7 100644
--- a/servers/rendering/rendering_server_default.h
+++ b/servers/rendering/rendering_server_default.h
@@ -359,6 +359,7 @@ public:
 	BIND2(reflection_probe_set_enable_shadows, RID, bool)
 	BIND2(reflection_probe_set_cull_mask, RID, uint32_t)
 	BIND2(reflection_probe_set_resolution, RID, int)
+	BIND2(reflection_probe_set_lod_threshold, RID, float)
 
 	/* DECAL API */
 
@@ -545,6 +546,7 @@ public:
 	BIND2(viewport_set_msaa, RID, ViewportMSAA)
 	BIND2(viewport_set_screen_space_aa, RID, ViewportScreenSpaceAA)
 	BIND2(viewport_set_use_debanding, RID, bool)
+	BIND2(viewport_set_lod_threshold, RID, float)
 
 	BIND2R(int, viewport_get_render_info, RID, ViewportRenderInfo)
 	BIND2(viewport_set_debug_draw, RID, ViewportDebugDraw)
@@ -673,6 +675,7 @@ public:
 	BIND5(instance_geometry_set_draw_range, RID, float, float, float, float)
 	BIND2(instance_geometry_set_as_instance_lod, RID, RID)
 	BIND4(instance_geometry_set_lightmap, RID, RID, const Rect2 &, int)
+	BIND2(instance_geometry_set_lod_bias, RID, float)
 
 	BIND3(instance_geometry_set_shader_parameter, RID, const StringName &, const Variant &)
 	BIND2RC(Variant, instance_geometry_get_shader_parameter, RID, const StringName &)
diff --git a/servers/rendering/rendering_server_wrap_mt.h b/servers/rendering/rendering_server_wrap_mt.h
index 62a866955d..20556779fe 100644
--- a/servers/rendering/rendering_server_wrap_mt.h
+++ b/servers/rendering/rendering_server_wrap_mt.h
@@ -266,6 +266,7 @@ public:
 	FUNC2(reflection_probe_set_enable_shadows, RID, bool)
 	FUNC2(reflection_probe_set_cull_mask, RID, uint32_t)
 	FUNC2(reflection_probe_set_resolution, RID, int)
+	FUNC2(reflection_probe_set_lod_threshold, RID, float)
 
 	/* DECAL API */
 
@@ -450,6 +451,8 @@ public:
 	FUNC2(viewport_set_screen_space_aa, RID, ViewportScreenSpaceAA)
 	FUNC2(viewport_set_use_debanding, RID, bool)
 
+	FUNC2(viewport_set_lod_threshold, RID, float)
+
 	//this passes directly to avoid stalling, but it's pretty dangerous, so don't call after freeing a viewport
 	virtual int viewport_get_render_info(RID p_viewport, ViewportRenderInfo p_info) {
 		return rendering_server->viewport_get_render_info(p_viewport, p_info);
@@ -575,6 +578,7 @@ public:
 	FUNC5(instance_geometry_set_draw_range, RID, float, float, float, float)
 	FUNC2(instance_geometry_set_as_instance_lod, RID, RID)
 	FUNC4(instance_geometry_set_lightmap, RID, RID, const Rect2 &, int)
+	FUNC2(instance_geometry_set_lod_bias, RID, float)
 
 	FUNC3(instance_geometry_set_shader_parameter, RID, const StringName &, const Variant &)
 	FUNC2RC(Variant, instance_geometry_get_shader_parameter, RID, const StringName &)
diff --git a/servers/rendering_server.h b/servers/rendering_server.h
index 598c23f4ee..6f7359b276 100644
--- a/servers/rendering_server.h
+++ b/servers/rendering_server.h
@@ -507,6 +507,7 @@ public:
 	virtual void reflection_probe_set_enable_shadows(RID p_probe, bool p_enable) = 0;
 	virtual void reflection_probe_set_cull_mask(RID p_probe, uint32_t p_layers) = 0;
 	virtual void reflection_probe_set_resolution(RID p_probe, int p_resolution) = 0;
+	virtual void reflection_probe_set_lod_threshold(RID p_probe, float p_pixels) = 0;
 
 	/* DECAL API */
 
@@ -805,6 +806,8 @@ public:
 
 	virtual void viewport_set_use_debanding(RID p_viewport, bool p_use_debanding) = 0;
 
+	virtual void viewport_set_lod_threshold(RID p_viewport, float p_pixels) = 0;
+
 	enum ViewportRenderInfo {
 		VIEWPORT_RENDER_INFO_OBJECTS_IN_FRAME,
 		VIEWPORT_RENDER_INFO_VERTICES_IN_FRAME,
@@ -836,6 +839,7 @@ public:
 		VIEWPORT_DEBUG_DRAW_SDFGI,
 		VIEWPORT_DEBUG_DRAW_SDFGI_PROBES,
 		VIEWPORT_DEBUG_DRAW_GI_BUFFER,
+		VIEWPORT_DEBUG_DRAW_DISABLE_LOD,
 
 	};
 
@@ -1142,6 +1146,7 @@ public:
 	virtual void instance_geometry_set_draw_range(RID p_instance, float p_min, float p_max, float p_min_margin, float p_max_margin) = 0;
 	virtual void instance_geometry_set_as_instance_lod(RID p_instance, RID p_as_lod_of_instance) = 0;
 	virtual void instance_geometry_set_lightmap(RID p_instance, RID p_lightmap, const Rect2 &p_lightmap_uv_scale, int p_lightmap_slice) = 0;
+	virtual void instance_geometry_set_lod_bias(RID p_instance, float p_lod_bias) = 0;
 
 	virtual void instance_geometry_set_shader_parameter(RID p_instance, const StringName &, const Variant &p_value) = 0;
 	virtual Variant instance_geometry_get_shader_parameter(RID p_instance, const StringName &) const = 0;