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  • rt gpu noise threshold

    im doing some tests, 3.1.10 and with a paths/pixel of 800 i get a pretty clean render.. that was with the noise threshold on 0

    i then realised that i was probably missing out on some rendering efficiency, as it would continue sampling all the pixels until the end, even if they were clean.

    so i tried introducing a noise threshold.. first of 0.01, then down to 0.005. i get a really noisy result in the hardest to clear reflective areas. and for the same rendertime, a much worse result.

    this is with sub pixel mapping and clamp output set to 1.

    surely the noise threshold shouldnt do this?

    Click image for larger version

Name:	thresh_005_5_min.jpg
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ID:	881369Click image for larger version

Name:	800 paths_thresh_0.jpg
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ID:	881368

    note timestamps are wrong.. 800 paths rendered for 5 mins. noise threshold 0.005 i set to render with a 5 min limit to match.

  • #2
    ok seems turning off "clamp output" has resolved the issue.

    on a related note, sub-pixel mapping doesnt seem to make much difference with cuda.. to quality or time. is it supported?

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    • #3
      Originally posted by super gnu View Post
      ok seems turning off "clamp output" has resolved the issue.

      on a related note, sub-pixel mapping doesnt seem to make much difference with cuda.. to quality or time. is it supported?
      Hi,

      Subpixel mapping is not supported in RT/GPU yet.
      Tashko Zashev | chaos.com
      Chaos Support Representative | contact us

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