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Noise through panes of glass

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  • Noise through panes of glass

    Recently finished a job on which I struggled a lot with this particular problem. Double glazed partitions everywhere. (hello massive rendertimes)

    Whenever a few panes of glass stacked up I started to get areas of noise that permeated every single pass.

    Since I cant post anything from that job, ive recreated a simple scene which shows what I mean.

    Note that there are no lights or GI in the scene, as when troubleshooting the main file I found that the noise was exactly the same with or without GI and with or without lights.

    What is this noise and how do you get rid of it?

    you can see 2 panes are fine. but beyond that is bad. AA is lowered to exaggerate the effect.

    I tried all spinners and cutoffs I can think of

    Any ideas?
    Attached Files

  • #2
    This is built into V-Ray 3.0 right now - beyond a certain ray depth, it will choose randomly between reflections and refractions. This reduces render times, but introduces some noise. More AA subdivs generally reduce the effect.

    For the next service pack I've added a bit more logic to this, so that the random choice only occurs for reflections/refractions that do not contribute too much to the image, so it should be a lot better.

    Best regards,
    Vlado
    I only act like I know everything, Rogers.

    Comment


    • #3
      I see, good to understand whats going on. But this requires (or did on my scene) a lot of AA to clean up, on top of the stacked refractions and reflections I was getting some pretty horrific render times.

      Comment


      • #4
        Originally posted by AlexP View Post
        I see, good to understand whats going on. But this requires (or did on my scene) a lot of AA to clean up, on top of the stacked refractions and reflections I was getting some pretty horrific render times.
        Yes, I realized somewhat later that it is not always a desirable thing.

        Best regards,
        Vlado
        I only act like I know everything, Rogers.

        Comment


        • #5
          is there a nightly that handle this problem better?
          Surrealismo
          https://www.facebook.com/surrrealismo

          Comment


          • #6
            No, not yet. Will let you know when there is one, hopefully a bit later this week.

            Best regards,
            Vlado
            I only act like I know everything, Rogers.

            Comment


            • #7
              This should be better for the nightly/stable builds from today.

              Best regards,
              Vlado
              I only act like I know everything, Rogers.

              Comment


              • #8
                great! how can I acces that build?
                Surrealismo
                https://www.facebook.com/surrrealismo

                Comment


                • #9
                  Email support@chaosgroup.com and ask for access to the stable builds.

                  Best regards,
                  Vlado
                  I only act like I know everything, Rogers.

                  Comment

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