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  • Refractive GI issue

    Hi !

    I have read about the refractive GI issue on the forum, so I just want to confirm that I understand it correctly. The scene I am rendering is an interior shot with a big curved glass wall. I have set up a domelight/hdri with some complinentary rect lights. When I render I get this blotchyness caused by the refractive caustics it seems.

    I have tried all kind of workarounds but I still don´t get a good GI solution. I have tried:

    Turning of the refractive caustics (in the render settings), the blocthes goes away but I dont get a good GI since the GI dont make it through the glass material ( I assume )

    If I turn on affect shadows on the material I get some light through but I get a much flatter GI pass, it seems like this calculates more directlight instead ?

    I created a material wrapper for the glass material and disable caustics etc, but the blotchyness is still present in the GI pass.

    Is there a good way to create a GI solution through a refractive glass without getting this artifacts ?

    Thanks !

  • #2
    im not sure of the methodology in maya, but in max you just disable refractive GI, and then go to the object properties of the glass and disable "generate" "recieve" and "visible to" gi.

    that way the gi is calculated as if the glass wasnt present.

    you can leave "affect shadows" turned on as this only affects direct lighting.

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    • #3
      Thank you for your super fast answer !
      I´m on a deadline (aren´t we all ) so much appreciated

      I created a single object properties node on the glass surfaces and disabled as you informed. Worked great. Thanks a lot !

      / Johan

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