The VRmat material is useful for working across multiple platforms; the VRmat loads a V-Ray shader from a file (.vrmat,.vismat, .vrscene, .mtlx) and makes the materials in these files available for use in the scene. These files can be exported from Maya or 3ds Max and used on any platform.
To share materials cross-platform, an existing V-Ray material is converted through theVRMat Converter, the output of which can then be read into a scene using the VRmat material in the material editor of the destination platform. This allows you to use a material originally created in 3ds Max or Maya in a Cinema 4D scene.
Note: If you load a shader from a .vrscenefile, you can only use it directly; you cannot edit it.
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If you want to edit the scale of the VRmat's UVs, you can do so using the VRayObjectProperties tag, which adds additional UV scaling. See the VRayObjectProperties page for more information.