The VRayPlane is a very simple plugin that implements a procedural infinite plane primitive for V-Ray. The source code of VRayPlane is also available as part of the V-Ray Geometry SDK.
The VRayPlane can be created from the the VRay category of the Createpaneltab.
The position of the plane depends on its transformation in the 3ds Max scene.
You can have more than one infinite plane in the scene.
The plane is rendered with the material applied to the VRayPlane object.
Shadow maps will do not include information about the plane object. However, other objects will cast correct shadows on the plane, even with shadow maps.