Cuboid shape for use with occlusion culling in OccluderInstance3D.
BoxOccluder3D stores a cuboid shape that can be used by the engine's occlusion culling system.
See OccluderInstance3D's documentation for instructions on setting up occlusion culling.
Vector3 size =
Vector3(1, 1, 1)
The box's size in 3D units.