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DR Buckets gone wild (phantom buckets appear all over the image) & other DR problems

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  • DR Buckets gone wild (phantom buckets appear all over the image) & other DR problems

    Build 3.60.03 Max 2018 Windows 10
    PROBLEM 1 with Distributed Rendering
    When i am doing test renders at low resolution (for example 2000x1000) everything seems OK. When i switch to high res (for example 4000x2000) the render will not conclude properly. I have a total of 48 threads with which i can render - so 48 buckets visible on the VFB max. When i try to render at the higher res, it process the LightCache and Irradiance Map OK, but when its starts the final render phase, the buckets start to replicate, so instead of 48 buckets i will have something like 120 buckets (I have not counted them all - but basically the VFB will fill up with buckets that do not actually exist. Of course those buckets never actually render - they just end up as blank squares that fail to compute. I am only able to solve this by going back to Max 2017 (which is not always doable). I have experienced this same problem some years ago on an earlier version of vray, on an earlier version of windows and on different hardware. Another solution is to NOT use Distributed Rendering and instead use Backburner. In that case, the renders in Max 2018 are completed correctly on the nodes without a problem (but thats not the solution i am looking for)
    PROBLEM 2 with Distributed Rendering
    I have a small interior scene and when i render it you can see some of the buckets have different lighting to the other buckets. Upon further inspection it appears that the host computer is rendering with one lighting setup and the nodes are all rendering with a different setup. So, if i turn off the host - so I render from the host computer but the host computer is NOT participating in the actual processing, i get a correct render with no problems (rendered using 3 nodes). If i completely turn off DR and render just with the local machine, I get a completely different lighting. It appears as if the sun has moved to a totally different position in the sky. I checked for animation but there are NO keyframes on the sun. No lights in the scene are animated.

    Anyone else seen this problem ?
    Win10.Ryzen1950X. 80GbRam. RTX3080.RTX2070.Sketchup 22.0.354.VRaySketchUp.6001. - NvidiaStudioDriver 527.37

  • #2
    Hi,

    Thank you for the detailed explanation of both issues.
    The best way to troubleshoot the first one would be a remote connection where we can perform some tests. Is it possible to do this in convenient time for you? Can you send an email to support@chaosgroup.com with link to this forum thread ?

    About the second issue, is it possible that you have missing plugins or different maps with identical names? Are you able to fix this by enabling the V-Ray Override material option from the global switches?
    Do you get any warnings in the log - main machine or render servers ?
    Maybe we can check this issue as well in the remote session?
    Tashko Zashev | chaos.com
    Chaos Support Representative | contact us

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    • #3
      Thankyou. I switched cameras to a standard Max camera (not the Physical camera) and suddenly everything rendered as normal / as expected / no problems. I then switched back to the Physical camera, and now it too is rendering as normal / as expected / no problems. So I really dont understand how this could be explained.
      Win10.Ryzen1950X. 80GbRam. RTX3080.RTX2070.Sketchup 22.0.354.VRaySketchUp.6001. - NvidiaStudioDriver 527.37

      Comment


      • #4
        Ahh, I'm not sure way this change fixed the issues above, but it would be good to find what is going on. If you still have the "old" version of the scene please archive and send it to our support mail. In case that the archive size exceeds the mail limit we can provide our FTP.
        Tashko Zashev | chaos.com
        Chaos Support Representative | contact us

        Comment


        • #5
          ok I will look into this to see if the older file will reproduce the same problem as before......& then get back to you. thx !
          Win10.Ryzen1950X. 80GbRam. RTX3080.RTX2070.Sketchup 22.0.354.VRaySketchUp.6001. - NvidiaStudioDriver 527.37

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