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abmitalia
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Found this here -> http://www.spot3d.com/vray/help/150SP1/

 

 

  • Isolated bright splotches - there may be different causes for these:
    • GI caustics - if you have reflective or refractive surfaces in your scene, especially if they are glossy, V-Ray may try to compute the GI caustics for these surfaces. Since caustics usually require a lot of sampling to get right, there may be splotches.
    • Incorrect or missing UVW coordinates - if some objects in your scene lack UVW coordinates, or the UVW coordinates fall outside the texture map, this can produce splotches or weird colors in the irradiance map. The solution would be to apply correct UVW coordinates to those objects.

     

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