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  • Different result between CPU and GPU

    I am new to RT and I have a question.
    Probably it will be obvious to the most of you but as I said I am new to RT and I don't know how it "behaves".

    I have attached 2 images.
    One is rendered through RT with CPU and the other with the CUDA engine.

    The CPU result is similar to the Vray (not RT) result (BF+LC etc.)
    The GPU though is like its lost its specular somehow.

    Also in another scene that I tested the GPU, the whole image looked colored tinted and again no specular.

    Click image for larger version

Name:	RT_CPU.jpg
Views:	1
Size:	431.8 KB
ID:	882552Click image for larger version

Name:	RT_GPU.jpg
Views:	1
Size:	349.3 KB
ID:	882553
    Is it normal?

    And how can I overcome this?

    Thank you in advance
    Last edited by Zakkorn; 28-07-2015, 11:55 AM.
    Dual Xeon 2690 v3, Asus Z10PE-D8 WS, 64GB, SSD Win10, TitanX(Maxwell)

  • #2
    I found what was causing the issue.
    I had a Falloff map to the RGlossiness channel.

    I didn't expect that the falloff map will be incompatible with RT
    Dual Xeon 2690 v3, Asus Z10PE-D8 WS, 64GB, SSD Win10, TitanX(Maxwell)

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    • #3
      Originally posted by Zakkorn View Post
      I found what was causing the issue. I had a Falloff map to the RGlossiness channel. I didn't expect that the falloff map will be incompatible with RT
      It should be. Can you share the scene so we can take a look ?
      Thanks.
      V-Ray fan.
      Looking busy around GPUs ...
      RTX ON

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      • #4
        Sure!

        I have sent it to support
        Last edited by Zakkorn; 29-07-2015, 01:47 AM.
        Dual Xeon 2690 v3, Asus Z10PE-D8 WS, 64GB, SSD Win10, TitanX(Maxwell)

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        • #5
          I found out that that the Mixed Curve in Falloff causes the issue.
          If I have a Falloff with the default Mixed curve, it works.
          Dual Xeon 2690 v3, Asus Z10PE-D8 WS, 64GB, SSD Win10, TitanX(Maxwell)

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          • #6
            Originally posted by Zakkorn View Post
            I found out that that the Mixed Curve in Falloff causes the issue.
            If I have a Falloff with the default Mixed curve, it works.
            Yes, it is now logged to our bug tracking system. Thank you very much.
            Tashko Zashev | chaos.com
            Chaos Support Representative | contact us

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            • #7
              Thanks for the news
              Dual Xeon 2690 v3, Asus Z10PE-D8 WS, 64GB, SSD Win10, TitanX(Maxwell)

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