Occluder shape resource for use with occlusion culling in [OccluderInstance3D].
[Occluder3D] stores an occluder shape that can be used by the engine's occlusion culling system. See [OccluderInstance3D]'s documentation for instructions on setting up occlusion culling.
$DOCS_URL/tutorials/3d/occlusion_culling.html
Returns the occluder shape's vertex indices.
Returns the occluder shape's vertex positions.