Flat 2D polygon shape for use with occlusion culling in [OccluderInstance3D]. [PolygonOccluder3D] stores a polygon shape that can be used by the engine's occlusion culling system. When an [OccluderInstance3D] with a [PolygonOccluder3D] is selected in the editor, an editor will appear at the top of the 3D viewport so you can add/remove points. All points must be placed on the same 2D plane, which means it is not possible to create arbitrary 3D shapes with a single [PolygonOccluder3D]. To use arbitrary 3D shapes as occluders, use [ArrayOccluder3D] or [OccluderInstance3D]'s baking feature instead. See [OccluderInstance3D]'s documentation for instructions on setting up occlusion culling. $DOCS_URL/tutorials/3d/occlusion_culling.html The polygon to use for occlusion culling. The polygon can be convex or concave, but it should have as few points as possible to maximize performance. The polygon must [i]not[/i] have intersecting lines. Otherwise, triangulation will fail (with an error message printed).