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iRay: White Speckles

ccthien83ccthien83 Posts: 383
edited September 2016 in Daz Studio Discussion

Hi guys,

I try to render the eyes but it got White Speckles like this video:

After 100% it is not like that but it still remain some noise in the eyes and do not look good...

Note that the White Speckles is more when I set Distant Light flux to high value, about 200000 and the White Speckles very clear, I would like to make it bright and it come with that.

Any tricks to render the eyes like this:
http://orig13.deviantart.net/69df/f/2015/135/3/7/tilted_rerender_by_second_circle-d8thv8u.jpg

Thank you

Post edited by ccthien83 on

Comments

  • Richard HaseltineRichard Haseltine Posts: 102,464

    High light levels with highly glossy surfaces can make it hard to resolve noise. Increasing the quality setting (which dictates how strict Iray is about defining convergence) may help, if you can't reduce the light or glossiness. Rendering to a large size and then downsampling will also reduce noise, by averaging it out. Both options will make for slower renders, of course.

  • ccthien83ccthien83 Posts: 383

    Thank you Richard Haseltine, could you tell me how to Increasing the quality setting?

  • ToborTobor Posts: 2,300

    White noise is generally fireflies, which don't respond the same as unconverged pixels. As such, increasing any "quality" metric is not bound to have as much effect. You are best off rethinking the surfaces where the noise appears. Aspects of that surface, and the light you are using, are contriburing to the fireflies.  

    Check out the following PDF which addresses (on page 6) some steps you can take to deal with noise caused by fireflies. 

    http://irayrender.com/fileadmin/filemount/editor/PDF/iray_Performance_Tips_100511.pdf

    From your video, while the affected surface(s) do seem to be white, they don't appear to be bright white, or overlit, but this may be the result of extreme tone mapping that could be causing the renderer to operate outside its use case specifications. To verify this, you might want to return the tone mapping settings to their defaults, and adjust lighting if it's out-of-whack.

  • ccthien83ccthien83 Posts: 383
    edited September 2016

    Thank you Tobor, very clear explanation.

    Post edited by ccthien83 on
  • MythmakerMythmaker Posts: 606

    You may find this free script from MCasual very useful

    http://www.daz3d.com/forums/discussion/91071/mcjdespeckle-pcwin-app-remove-fireflies-in-iray-new-daz-studio-frontend/p1

  • ccthien83ccthien83 Posts: 383

    Great tool, thank you Mythmaker.

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