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V-Ray 6 - Dim Fall Off breaks when used with a matte.

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  • V-Ray 6 - Dim Fall Off breaks when used with a matte.

    As the title says the reflection dim fall off breaks when the material is plugged into a VrMtlWrapper set to matte or on objects set as a matte in V-Ray Properties. Dim distance works as expected but the reflection simply cuts off at the distance limit without any fade regardless of the fall off setting.

  • #2
    It gets weirder.

    This is what it should look like. In this example image there are no mattes and everything behaves as expected:
    Click image for larger version

Name:	Sample-No Matte.jpg
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    Here's a screenshot of the viewport. Notice there's an invisible light between the camera and subject.
    Click image for larger version

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    Here's how the above renders when the ground plane is set to be a matte (in this case using mtlwrapper). Reflection dim fall off is ignored.
    Click image for larger version

Name:	Sample-With Matte.jpg
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    And finally for extra weirdness, I've moved the invisible light so its top edge falls between the bottom of the subject and the bottom of the frame. Now the reflection is only visible in the portion of the ground plane seen through the invisible light.
    Click image for larger version

Name:	Sample- Weirdness.jpg
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    If I move the invisible light behind the camera I get no reflection at all.
    Click image for larger version

Name:	Sample-Nope.jpg
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    Hope this gets fixed soon! It completely breaks my workflow for product renders. I will have to revert to V-Ray 5 for now.

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    • #3
      Hi thanks for the report. I was able to reproduce this in a simple scene. The issue is reported under VMAX-12404
      Vladimir Krastev | chaos.com
      Chaos Support Representative | contact us

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      • #4
        Thanks for checking into it!

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        • #5
          Hi our developers are working on a fix and with our tests it shows good results so the issue seems fixed. Could you send us your scene so we can test with it as well?
          You can do that here or though our support contact form.
          Vladimir Krastev | chaos.com
          Chaos Support Representative | contact us

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          • #6
            The scene file has been uploaded.

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            • #7
              Thank you for the scene. I have tested it with our nightly build that has the fix and everything renders fine.
              The fix will be available to users in the upcoming hotfix release for V-Ray 6.
              The fix is also added to the stable versions from today. You can test your scene with them as well.
              Last edited by vladimir_krastev; 21-07-2022, 01:48 AM.
              Vladimir Krastev | chaos.com
              Chaos Support Representative | contact us

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              • #8
                Great news! Thanks for the speedy fix! Is there an ETA on the hotfix release?

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