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    Displacement noise / render error

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    • A Offline
      agattila
      last edited by

      Hi Everyone,

      Please help, I have a problem with displacement renders.

      I'd like to render a standing seam metal wall panel with a displacement map. I've tried many different images for disp. map and different render settings but those strange spots and noisy lines were always there.


      http://img709.imageshack.us/img709/4487/displacementerror.th.jpg


      http://img695.imageshack.us/img695/4605/displacementerror2.th.jpg

      Sometimes the noisy area disappears when I change the viewpoint, but in most cases only the "position" of the noise changes.

      How can I get rid of those spots and lines?

      Thanks a lot!

      Attila

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      • thomthomT Offline
        thomthom
        last edited by

        I think higher rendering settings would do the trick. What setup do you have? Irradiance Map + Lightcache?

        Thomas Thomassen β€” SketchUp Monkey & Coding addict
        List of my plugins and link to the CookieWare fund

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        • A Offline
          agattila
          last edited by

          Yes, irradiance + light cache. I tried to change subdivs, samples but that noise is still there...

          This is my displacement map:
          http://img707.imageshack.us/img707/885/panel2f.th.png

          I've tried different images and different image sizes with the same result...

          Here is my visopt
          displacementtest.zip

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          • thomthomT Offline
            thomthom
            last edited by

            Can you post the sample file? Easier to investigate by looking at the actual model.

            Thomas Thomassen β€” SketchUp Monkey & Coding addict
            List of my plugins and link to the CookieWare fund

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            • A Offline
              agattila
              last edited by

              I hope everything is in the zip πŸ˜›

              disptest.zip

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              • thomthomT Offline
                thomthom
                last edited by

                @agattila said:

                Sometimes the noisy area disappears when I change the viewpoint, but in most cases only the "position" of the noise changes.

                Ah - should have picked up on this earlier.
                try decreasing Edge Length under Displacement. By default the displacement is view based.

                Thomas Thomassen β€” SketchUp Monkey & Coding addict
                List of my plugins and link to the CookieWare fund

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                • A Offline
                  agattila
                  last edited by

                  Ok, so here is my correction for the first post:
                  I've tried many different render settings, except this one... πŸ˜„

                  Edge length 1px solved the problem.

                  Thank you thomthom!!

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