Flat plane shape for use with occlusion culling in [OccluderInstance3D].
[QuadOccluder3D] stores a flat plane shape that can be used by the engine's occlusion culling system. See also [PolygonOccluder3D] if you need to customize the quad's shape. See [OccluderInstance3D]'s documentation for instructions on setting up occlusion culling.
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- The quad's size in 3D units.