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Iray grain not reducing with convergance?

Testing6790Testing6790 Posts: 1,091
edited July 2015 in The Commons

Hi all,

I'm working on a scene that gets to about 10% convergance at ~20 minutes and 2000 iterations (I think). However, the quality does not seem to improve at all in the remaining time of the render. Any ideas?

I'll post exact settings later, I'm aware I'm not giving much information but i'm hoping there are general things that I might be doing wrong. I have the render quality set to 1 and the samples fairly high.

Post edited by Testing6790 on

Comments

  • mjc1016mjc1016 Posts: 15,001

    What lights and is everything in the scene Iray materials?

  • Testing6790Testing6790 Posts: 1,091
    edited July 2015

    Everything is IRAY (ctrl-A --> iray uber base, ignore) and for lights I have the environment dome, camera headlamp off, 3 spotlights and 2-3 point lights. There are some shelves, lamps, a couch and two gen2 figures, as well as their outfits.

    I'm running on an i-7 4770k @ 4.5 Ghz, 16 GB RAM and a 780 GTX with 3-4 GB VRAM (not sure exactly which)

    Post edited by Testing6790 on
  • the3dwizardthe3dwizard Posts: 495

    Did you try changing Environment Mode to just dome only or just scene only?  Also you might try hiding some of the lights and figures.  This way you can get more iterations in a shorter time.  Might help you trouble shoot but 2000 may not be enough or there might be a problem light or object.

    Cheers!

  • Richard HaseltineRichard Haseltine Posts: 108,347

    Is there an actual modelled dome in your scene? If theer is that will block the light from the Iray environment dome.

  • Testing6790Testing6790 Posts: 1,091
    edited July 2015

    No, I wish I could post a screenshot of the scene but I'm not at my rendering machine. I can't remember the name of the product, but I'm using the 3 walled photoshoot scene that comes with that goofy modeling couch (which I'm not using). I have some ivy blocking the two windows for asthetic purposes. I have the sun shining in those windows but it's not a lot of light, most of it is from my spotlights.

    Post edited by Testing6790 on
  • Testing6790Testing6790 Posts: 1,091

    Would swapping my lights to "photometric" lights instead of the daz default spotlights and point lights increase the quality? I add quotes because it's in my notes from reading today but have not actually had a chance to get home and mess with them.

  • larsmidnattlarsmidnatt Posts: 4,511
    edited July 2015

    i think you need to do that, yes. with my limited iRay experience you need to use photometric lights.

    one thing you may want to practice is shutting off all lights and testing them one at a time. Make sure each light is behaving as you expect. that includes shutting off the environment light.

    Post edited by larsmidnatt on
  • the3dwizardthe3dwizard Posts: 495
    edited July 2015

    That is correct, all your lights should either be "photometric" or light emitting surfaces using the IRAY shader emission parameters.  For example the light bulbs in your lamps could be light emitting surfaces and not point lights.  If you put the point light inside the bulb it won't render correctly because the bulb surface will block it.

    Cheers!

    Post edited by the3dwizard on
  • mjc1016mjc1016 Posts: 15,001

    You shouldn't need to replace the lights...but you may need to check them.  Studio should, depending on which renderer is being used, have the 'proper'  parameters...photometric for Iray/'standard' for 3Delight...if you are running the latest version of 4.8 (I can't remember if the first version had the auto and I know some of the betas didn't).

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