Implement occlusion culling.

core/math/math_funcs.h

@@ -103,6 +103,9 @@ class Math {
 	static _ALWAYS_INLINE_ double log(double p_x) { return ::log(p_x); }
 	static _ALWAYS_INLINE_ float log(float p_x) { return ::logf(p_x); }
 
+	static _ALWAYS_INLINE_ double log2(double p_x) { return ::log2(p_x); }
+	static _ALWAYS_INLINE_ float log2(float p_x) { return ::log2f(p_x); }
+
 	static _ALWAYS_INLINE_ double exp(double p_x) { return ::exp(p_x); }
 	static _ALWAYS_INLINE_ float exp(float p_x) { return ::expf(p_x); }
 

doc/classes/GeometryInstance3D.xml

@@ -48,6 +48,8 @@
 		</member>
 		<member name="gi_mode" type="int" setter="set_gi_mode" getter="get_gi_mode" enum="GeometryInstance3D.GIMode" default="0">
 		</member>
+		<member name="ignore_occlusion_culling" type="bool" setter="set_ignore_occlusion_culling" getter="is_ignoring_occlusion_culling" default="false">
+		</member>
 		<member name="lod_bias" type="float" setter="set_lod_bias" getter="get_lod_bias" default="1.0">
 		</member>
 		<member name="lod_max_distance" type="float" setter="set_lod_max_distance" getter="get_lod_max_distance" default="0.0">

doc/classes/Occluder3D.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="Occluder3D" inherits="Resource" version="4.0">
+	<brief_description>
+	</brief_description>
+	<description>
+	</description>
+	<tutorials>
+	</tutorials>
+	<methods>
+	</methods>
+	<members>
+		<member name="indices" type="PackedInt32Array" setter="set_indices" getter="get_indices" default="PackedInt32Array(  )">
+		</member>
+		<member name="vertices" type="PackedVector3Array" setter="set_vertices" getter="get_vertices" default="PackedVector3Array(  )">
+		</member>
+	</members>
+	<constants>
+	</constants>
+</class>

doc/classes/OccluderInstance3D.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="OccluderInstance3D" inherits="Node3D" version="4.0">
+	<brief_description>
+	</brief_description>
+	<description>
+	</description>
+	<tutorials>
+	</tutorials>
+	<methods>
+		<method name="get_bake_mask_bit" qualifiers="const">
+			<return type="bool">
+			</return>
+			<argument index="0" name="layer" type="int">
+			</argument>
+			<description>
+			</description>
+		</method>
+		<method name="set_bake_mask_bit">
+			<return type="void">
+			</return>
+			<argument index="0" name="layer" type="int">
+			</argument>
+			<argument index="1" name="enabled" type="bool">
+			</argument>
+			<description>
+			</description>
+		</method>
+	</methods>
+	<members>
+		<member name="bake_mask" type="int" setter="set_bake_mask" getter="get_bake_mask" default="4294967295">
+		</member>
+		<member name="occluder" type="Occluder3D" setter="set_occluder" getter="get_occluder">
+		</member>
+	</members>
+	<constants>
+	</constants>
+</class>

doc/classes/ProjectSettings.xml

@@ -1468,6 +1468,12 @@
 		</member>
 		<member name="rendering/mesh_lod/lod_change/threshold_pixels" type="float" setter="" getter="" default="1.0">
 		</member>
+		<member name="rendering/occlusion_culling/bvh_build_quality" type="int" setter="" getter="" default="2">
+		</member>
+		<member name="rendering/occlusion_culling/occlusion_rays_per_thread" type="int" setter="" getter="" default="512">
+		</member>
+		<member name="rendering/occlusion_culling/use_occlusion_culling" type="bool" setter="" getter="" default="false">
+		</member>
 		<member name="rendering/reflections/reflection_atlas/reflection_count" type="int" setter="" getter="" default="64">
 			Number of cubemaps to store in the reflection atlas. The number of [ReflectionProbe]s in a scene will be limited by this amount. A higher number requires more VRAM.
 		</member>

doc/classes/RenderingServer.xml

@@ -1999,6 +1999,24 @@
 				Sets the number of instances visible at a given time. If -1, all instances that have been allocated are drawn. Equivalent to [member MultiMesh.visible_instance_count].
 			</description>
 		</method>
+		<method name="occluder_create">
+			<return type="RID">
+			</return>
+			<description>
+			</description>
+		</method>
+		<method name="occluder_set_mesh">
+			<return type="void">
+			</return>
+			<argument index="0" name="arg0" type="RID">
+			</argument>
+			<argument index="1" name="arg1" type="PackedVector3Array">
+			</argument>
+			<argument index="2" name="arg2" type="PackedInt32Array">
+			</argument>
+			<description>
+			</description>
+		</method>
 		<method name="omni_light_create">
 			<return type="RID">
 			</return>
@@ -2412,6 +2430,16 @@
 				The scenario is the 3D world that all the visual instances exist in.
 			</description>
 		</method>
+		<method name="scenario_set_camera_effects">
+			<return type="void">
+			</return>
+			<argument index="0" name="scenario" type="RID">
+			</argument>
+			<argument index="1" name="effects" type="RID">
+			</argument>
+			<description>
+			</description>
+		</method>
 		<method name="scenario_set_debug">
 			<return type="void">
 			</return>
@@ -2897,6 +2925,22 @@
 				Sets the anti-aliasing mode. See [enum ViewportMSAA] for options.
 			</description>
 		</method>
+		<method name="viewport_set_occlusion_culling_build_quality">
+			<return type="void">
+			</return>
+			<argument index="0" name="quality" type="int" enum="RenderingServer.ViewportOcclusionCullingBuildQuality">
+			</argument>
+			<description>
+			</description>
+		</method>
+		<method name="viewport_set_occlusion_rays_per_thread">
+			<return type="void">
+			</return>
+			<argument index="0" name="rays_per_thread" type="int">
+			</argument>
+			<description>
+			</description>
+		</method>
 		<method name="viewport_set_parent_viewport">
 			<return type="void">
 			</return>
@@ -3002,6 +3046,16 @@
 			<description>
 			</description>
 		</method>
+		<method name="viewport_set_use_occlusion_culling">
+			<return type="void">
+			</return>
+			<argument index="0" name="viewport" type="RID">
+			</argument>
+			<argument index="1" name="enable" type="bool">
+			</argument>
+			<description>
+			</description>
+		</method>
 		<method name="viewport_set_use_xr">
 			<return type="void">
 			</return>
@@ -3454,6 +3508,8 @@
 		</constant>
 		<constant name="VIEWPORT_DEBUG_DRAW_GI_BUFFER" value="17" enum="ViewportDebugDraw">
 		</constant>
+		<constant name="VIEWPORT_DEBUG_DRAW_OCCLUDERS" value="23" enum="ViewportDebugDraw">
+		</constant>
 		<constant name="SKY_MODE_QUALITY" value="1" enum="SkyMode">
 			Uses high quality importance sampling to process the radiance map. In general, this results in much higher quality than [constant Sky.PROCESS_MODE_REALTIME] but takes much longer to generate. This should not be used if you plan on changing the sky at runtime. If you are finding that the reflection is not blurry enough and is showing sparkles or fireflies, try increasing [member ProjectSettings.rendering/reflections/sky_reflections/ggx_samples].
 		</constant>
@@ -3606,6 +3662,12 @@
 		<constant name="SCENARIO_DEBUG_SHADELESS" value="3" enum="ScenarioDebugMode">
 			Draw all objects without shading. Equivalent to setting all objects shaders to [code]unshaded[/code].
 		</constant>
+		<constant name="VIEWPORT_OCCLUSION_BUILD_QUALITY_LOW" value="0" enum="ViewportOcclusionCullingBuildQuality">
+		</constant>
+		<constant name="VIEWPORT_OCCLUSION_BUILD_QUALITY_MEDIUM" value="1" enum="ViewportOcclusionCullingBuildQuality">
+		</constant>
+		<constant name="VIEWPORT_OCCLUSION_BUILD_QUALITY_HIGH" value="2" enum="ViewportOcclusionCullingBuildQuality">
+		</constant>
 		<constant name="INSTANCE_NONE" value="0" enum="InstanceType">
 			The instance does not have a type.
 		</constant>
@@ -3638,7 +3700,9 @@
 		<constant name="INSTANCE_LIGHTMAP" value="10" enum="InstanceType">
 			The instance is a lightmap.
 		</constant>
-		<constant name="INSTANCE_MAX" value="11" enum="InstanceType">
+		<constant name="INSTANCE_OCCLUDER" value="11" enum="InstanceType">
+		</constant>
+		<constant name="INSTANCE_MAX" value="12" enum="InstanceType">
 			Represents the size of the [enum InstanceType] enum.
 		</constant>
 		<constant name="INSTANCE_GEOMETRY_MASK" value="30" enum="InstanceType">
@@ -3653,7 +3717,9 @@
 		<constant name="INSTANCE_FLAG_DRAW_NEXT_FRAME_IF_VISIBLE" value="2" enum="InstanceFlags">
 			When set, manually requests to draw geometry on next frame.
 		</constant>
-		<constant name="INSTANCE_FLAG_MAX" value="3" enum="InstanceFlags">
+		<constant name="INSTANCE_FLAG_IGNORE_OCCLUSION_CULLING" value="3" enum="InstanceFlags">
+		</constant>
+		<constant name="INSTANCE_FLAG_MAX" value="4" enum="InstanceFlags">
 			Represents the size of the [enum InstanceFlags] enum.
 		</constant>
 		<constant name="SHADOW_CASTING_SETTING_OFF" value="0" enum="ShadowCastingSetting">

doc/classes/Viewport.xml

@@ -267,6 +267,8 @@
 		</member>
 		<member name="use_debanding" type="bool" setter="set_use_debanding" getter="is_using_debanding" default="false">
 		</member>
+		<member name="use_occlusion_culling" type="bool" setter="set_use_occlusion_culling" getter="is_using_occlusion_culling" default="false">
+		</member>
 		<member name="world_2d" type="World2D" setter="set_world_2d" getter="get_world_2d">
 			The custom [World2D] which can be used as 2D environment source.
 		</member>
@@ -419,6 +421,8 @@
 		</constant>
 		<constant name="DEBUG_DRAW_CLUSTER_REFLECTION_PROBES" value="22" enum="DebugDraw">
 		</constant>
+		<constant name="DEBUG_DRAW_OCCLUDERS" value="23" enum="DebugDraw">
+		</constant>
 		<constant name="DEFAULT_CANVAS_ITEM_TEXTURE_FILTER_NEAREST" value="0" enum="DefaultCanvasItemTextureFilter">
 			The texture filter reads from the nearest pixel only. The simplest and fastest method of filtering, but the texture will look pixelized.
 		</constant>

drivers/dummy/rasterizer_dummy.h

@@ -548,6 +548,12 @@ class RasterizerStorageDummy : public RendererStorage {
 	void lightmap_set_probe_capture_update_speed(float p_speed) override {}
 	float lightmap_get_probe_capture_update_speed() const override { return 0; }
 
+	/* OCCLUDER */
+
+	RID occluder_allocate() override { return RID(); }
+	void occluder_initialize(RID p_rid) override {}
+	void occluder_set_mesh(RID p_occluder, const PackedVector3Array &p_vertices, const PackedInt32Array &p_indices) {}
+
 	/* PARTICLES */
 
 	RID particles_allocate() override { return RID(); }

editor/editor_node.cpp

@@ -143,6 +143,7 @@
 #include "editor/plugins/multimesh_editor_plugin.h"
 #include "editor/plugins/navigation_polygon_editor_plugin.h"
 #include "editor/plugins/node_3d_editor_plugin.h"
+#include "editor/plugins/occluder_instance_3d_editor_plugin.h"
 #include "editor/plugins/ot_features_plugin.h"
 #include "editor/plugins/packed_scene_translation_parser_plugin.h"
 #include "editor/plugins/path_2d_editor_plugin.h"
@@ -6800,6 +6801,7 @@ EditorNode::EditorNode() {
 	add_editor_plugin(memnew(TextureRegionEditorPlugin(this)));
 	add_editor_plugin(memnew(GIProbeEditorPlugin(this)));
 	add_editor_plugin(memnew(BakedLightmapEditorPlugin(this)));
+	add_editor_plugin(memnew(OccluderInstance3DEditorPlugin(this)));
 	add_editor_plugin(memnew(Path2DEditorPlugin(this)));
 	add_editor_plugin(memnew(Path3DEditorPlugin(this)));
 	add_editor_plugin(memnew(Line2DEditorPlugin(this)));

editor/node_3d_editor_gizmos.cpp

@@ -47,6 +47,7 @@
 #include "scene/3d/listener_3d.h"
 #include "scene/3d/mesh_instance_3d.h"
 #include "scene/3d/navigation_region_3d.h"
+#include "scene/3d/occluder_instance_3d.h"
 #include "scene/3d/physics_joint_3d.h"
 #include "scene/3d/position_3d.h"
 #include "scene/3d/ray_cast_3d.h"
@@ -176,6 +177,7 @@ void EditorNode3DGizmo::Instance::create_instance(Node3D *p_base, bool p_hidden)
 	RS::get_singleton()->instance_geometry_set_cast_shadows_setting(instance, RS::SHADOW_CASTING_SETTING_OFF);
 	int layer = p_hidden ? 0 : 1 << Node3DEditorViewport::GIZMO_EDIT_LAYER;
 	RS::get_singleton()->instance_set_layer_mask(instance, layer); //gizmos are 26
+	RS::get_singleton()->instance_geometry_set_flag(instance, RS::INSTANCE_FLAG_IGNORE_OCCLUSION_CULLING, true);
 }
 
 void EditorNode3DGizmo::add_mesh(const Ref<ArrayMesh> &p_mesh, bool p_billboard, const Ref<SkinReference> &p_skin_reference, const Ref<Material> &p_material) {
@@ -1464,6 +1466,44 @@ void MeshInstance3DGizmoPlugin::redraw(EditorNode3DGizmo *p_gizmo) {
 }
 
 /////
+
+OccluderInstance3DGizmoPlugin::OccluderInstance3DGizmoPlugin() {
+	create_material("line_material", EDITOR_DEF("editors/3d_gizmos/gizmo_colors/occluder", Color(0.8, 0.5, 1)));
+}
+
+bool OccluderInstance3DGizmoPlugin::has_gizmo(Node3D *p_spatial) {
+	return Object::cast_to<OccluderInstance3D>(p_spatial) != nullptr;
+}
+
+String OccluderInstance3DGizmoPlugin::get_gizmo_name() const {
+	return "OccluderInstance3D";
+}
+
+int OccluderInstance3DGizmoPlugin::get_priority() const {
+	return -1;
+}
+
+void OccluderInstance3DGizmoPlugin::redraw(EditorNode3DGizmo *p_gizmo) {
+	OccluderInstance3D *occluder_instance = Object::cast_to<OccluderInstance3D>(p_gizmo->get_spatial_node());
+
+	p_gizmo->clear();
+
+	Ref<Occluder3D> o = occluder_instance->get_occluder();
+
+	if (!o.is_valid()) {
+		return;
+	}
+
+	Vector<Vector3> lines = o->get_debug_lines();
+	if (!lines.is_empty()) {
+		Ref<Material> material = get_material("line_material", p_gizmo);
+		p_gizmo->add_lines(lines, material);
+		p_gizmo->add_collision_segments(lines);
+	}
+}
+
+/////
+
 Sprite3DGizmoPlugin::Sprite3DGizmoPlugin() {
 }
 

editor/node_3d_editor_gizmos.h

@@ -100,6 +100,18 @@ class MeshInstance3DGizmoPlugin : public EditorNode3DGizmoPlugin {
 	MeshInstance3DGizmoPlugin();
 };
 
+class OccluderInstance3DGizmoPlugin : public EditorNode3DGizmoPlugin {
+	GDCLASS(OccluderInstance3DGizmoPlugin, EditorNode3DGizmoPlugin);
+
+public:
+	bool has_gizmo(Node3D *p_spatial) override;
+	String get_gizmo_name() const override;
+	int get_priority() const override;
+	void redraw(EditorNode3DGizmo *p_gizmo) override;
+
+	OccluderInstance3DGizmoPlugin();
+};
+
 class Sprite3DGizmoPlugin : public EditorNode3DGizmoPlugin {
 	GDCLASS(Sprite3DGizmoPlugin, EditorNode3DGizmoPlugin);