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Nvidia denoiser produces corrupted alpha on final renders

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  • Nvidia denoiser produces corrupted alpha on final renders

    I'm just doing a quick test using the nvidia ai denoiser. It seems to be working just fine in RT GPU. All the REs look correct.

    If I use it for a final GPU render, everything looks OK, except for the alpha RE. The bottom of the image looks inverted.

    1. Load attached scene
    2. Top menu > v-ray > render with v-ray > render engine = GPU

    If you watch the alpha RE while the buckets render, everything looks OK, until the denoiser runs at the end.


    Click image for larger version

Name:	nvidia_denoiser_corrupted_alpha.png
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    Attached Files
    Win10 Pro 64 / AMD Ryzen 9 5950X / 128GB / RTX 3090 + 1080 Ti / MODO
    I am the resurrection, and the life: he that believeth in me, though he were dead, yet shall he live - Jesus Christ

  • #2
    Hey, John,

    Thank you for the feedback. What I am missing with your scene file because I am not able to reproduce it? Nvidia driver release version 417.19.

    Cheers,
    Boyan Nalchadjiiski | QA Engineer @ Chaos |
    E-mail: boyan.nalchadjiiski@chaos.com

    Comment


    • #3
      I'm on modo 12.2v2, v-ray nightly 29113 and 430.64 nvidia drivers.

      I guess it's probably a driver issue. I updated to 430.64 due to a security update:

      https://nvidia.custhelp.com/app/answ...curity-updates

      https://www.forbes.com/sites/kevinmu...graphics-card/
      Last edited by 1funk; 13-05-2019, 01:50 PM.
      Win10 Pro 64 / AMD Ryzen 9 5950X / 128GB / RTX 3090 + 1080 Ti / MODO
      I am the resurrection, and the life: he that believeth in me, though he were dead, yet shall he live - Jesus Christ

      Comment


      • #4
        Originally posted by boyan View Post
        Hey, John,

        Thank you for the feedback. What I am missing with your scene file because I am not able to reproduce it? Nvidia driver release version 417.19.

        Cheers,
        By the way, are you sure about your driver version there? I couldnt get the nvidia denoiser working with 417. I thought you needed 419+ ?
        Win10 Pro 64 / AMD Ryzen 9 5950X / 128GB / RTX 3090 + 1080 Ti / MODO
        I am the resurrection, and the life: he that believeth in me, though he were dead, yet shall he live - Jesus Christ

        Comment


        • #5
          I installed 419.67 to test them out and I still see this issue
          Win10 Pro 64 / AMD Ryzen 9 5950X / 128GB / RTX 3090 + 1080 Ti / MODO
          I am the resurrection, and the life: he that believeth in me, though he were dead, yet shall he live - Jesus Christ

          Comment


          • #6
            I got Mark to test this on skype too and he sees the same bug
            Win10 Pro 64 / AMD Ryzen 9 5950X / 128GB / RTX 3090 + 1080 Ti / MODO
            I am the resurrection, and the life: he that believeth in me, though he were dead, yet shall he live - Jesus Christ

            Comment

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