Class representing a square mesh facing the camera.
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Class representing a square [PrimitiveMesh]. This flat mesh does not have a thickness. By default, this mesh is aligned on the X and Y axes; this rotation is more suited for use with billboarded materials. A [QuadMesh] is equivalent to a [PlaneMesh] except its default [member PlaneMesh.orientation] is [constant PlaneMesh.FACE_Z].