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IM versus BF for liquids etc: IM slower?

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  • IM versus BF for liquids etc: IM slower?

    I'm running a render now that is a honey jar (glass) with honey dripping down and pooling inside. Normally I use LC/BF but am trying to play with LC/IM these days.

    The projected render time is currently 79 hours, and that seems a bit long with 2X 980X plus 2X 920 plus a Xeon 5355 and a Q6600 all contributing via DR.

    (I might have expected 10-12 hours with BF, perhaps a little longer.)

    Because the render is running right now I can't see the exact setup, but IM was configured with the high preset, then changed to something like -6/-1 and 200 Subdivisions. Detail enhancement is on. Render size is 4K. There is a lot of depth of field blur going on as well, but no motion blur. Photon mapped caustics are off.

    I'm wondering if this render time suggests bad settings somewhere, or if this is just the wrong choice of GI for the subject? Some time ago I tried a similar scene using SolidRocks to configure the IM and it was also much slower than my LC/BF.

    Any input to guide my testing/optimizing, or should I just go back to LC/BF for this kind of thing?

    Thanks /b

    b
    Brett Simms

    www.heavyartillery.com
    e: brett@heavyartillery.com

  • #2
    I would try without the detail enhancement (maybe just with a bit of AO, but I don't like that one either )

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

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    • #3
      Thanks Vlado. I tried a test of a small section and it did seem to drop the render time down quite a bit, but this image seems to be suffering from that stuck bucket problem and I think that is contributing hugely to the render time as well.

      I tried it several times and always the same general area of the region render was hanging up - the main part of the region rendered in 15-20minutes and I killed the last two buckets after another 30-40 minutes.

      Reducing the trace depth did not seem to help, nor did turning off detail enhancement, at least not that I could see.

      I bundled up the file and emailed you the link in case you want to check it out.

      /b
      Brett Simms

      www.heavyartillery.com
      e: brett@heavyartillery.com

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      • #4
        Just wondering if you have configure the Dynamic Memory limit to the maximum avail to your lowest spec box?

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