VRayCarpaintUberMtlsimulates metallic car paint. It is a complex material with two layers: a base layer and a clear coat layer. The material allows the adjustment of each of these layers separately.
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To create a VRayCarpaintUberMtlyou have to first make a V-Ray Material Instance material and then assign the VRayCarpaintUberMtlas a Parent material.
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In order to select VRayCarpaintUberMtlas a Parent material you have to first make the plugin folder VRayForUnreal visible. Enable Show Engine Content and Show Plugin Content in the View Options of the Content Browser. Then the VRay Materials will be listed in the Parent dropdown menu.
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For your materials to work properly at render time make sure your textures have a valid file path (Source File in the texture Details panel). V-Ray loads the textures from that directory during rendering. If the texture is not found at the specified location, V-Ray will automatically export the texture. You can then find it in your project folder > Content > Texture Cache.