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On import of meshes V-Ray does a UV channel check. If the mesh has only 1 channel V-Ray enables the Generate Lightmap UVs in the Static Mesh editor, which tells Unreal to copy the UVs from the 1 channel to a new one and then does a packing process so that no UVs are out of the 0-1 range. If the mesh has a lot of polygons or bad UVs that may sometimes result in a freeze/crash depending on the hardware. |
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Be advised that when importing a vrscene for the first time all materials created by V-Ray for Unreal have to be compiled by the Unreal editor (shader compiling message in bottom right hand corner of the screen). This means all materials will not look properly until all shader compilations are finished. This process is part of the standard workflow in Unreal Engine. |
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