The VRayMtlOSL material can be used to load OSL shader code files (.osl) or OSL object code files (.oso) and render them directly with V-Ray. The VRayOSLMtl plug-in can be used with shaders that write in closure color output parameters.
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UI Path: ||Right-click on the geometry|| > Assign New Material...
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||Right-click on the geometry|| > Assign New Material... > VRay section > VRay Mtl 2Sided