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Artefacts in my D/S 4.6 Renders

TallulahdahlingTallulahdahling Posts: 387
edited December 1969 in New Users

New to D/S, not to 3D. But this problem is a new one to me.

Once in a while my renders in D/S have these colourful artefacts. It happens seldom enough that I haven't been able to see what the artefacted renders have had in common.

This render was just a test render, so I didn't render shadows, but look at all of those nifty fireflies! Where the heck did they come from?

So what causes this, and what should I do to prevent it?

FOREST_TESTt_ARTIFACTS.jpg
850 x 846 - 366K

Comments

  • TotteTotte Posts: 14,098
    edited December 1969

    I'm almost certain it is because you are using lights with deep shadow map, this sometimes happens with shadowmap and 3Delight, but never with raytraced shadows. Try to switch the lights from Shadowmapped to raytraced shadows.

  • mark128mark128 Posts: 1,029
    edited December 1969

    I agree with Totte, these look like the kind of artifacts you get with deep shadow mask shadows. I always use ray traced shadows because of this.

    I have been lead to believe that this is a fundamental problem with Renderman compliant render engines and deep shadow mask lights. It is not something that will be "fixed" soon, if ever. It would be up to 3Delight to fix the problem, not DAZ.

  • SzarkSzark Posts: 10,634
    edited December 1969

    Note the OP said they weren't using shadows in the attached render. ;)

  • SylvanSylvan Posts: 2,718
    edited December 1969

    If I run into something that's hard to trace, I either eleminate things one by one, or start over.
    Have to say they do look nifty, at first I thought I was looking at a field of flowers!

  • TallulahdahlingTallulahdahling Posts: 387
    edited December 1969

    Thanks everybody!

    I'll look at the shadow controls again to make sure that I turned off the shadows for every light, but I don't see any shadows in the render. When I do use shadows, I always use raytraced. Deep shadow map shadows aren't nearly as nice, and sometimes look freckly.

    Still, it's not impossible that I missed a shadow.... I do hope that's it. It makes it simple.

  • TallulahdahlingTallulahdahling Posts: 387
    edited December 1969

    Estroyer, it *does* look like a field of flowers!

    I was too annoyed to notice that by myself.

  • TallulahdahlingTallulahdahling Posts: 387
    edited December 1969

    I'm pleased to report that I did, indeed, miss checking the shadows on one light, and the shadow *was* set to "deep shadow".

    Mystery solved, case closed!

    Thanks for the tip, y'all.

  • HeraHera Posts: 1,958
    edited December 1969

    Since DAZ 4.8 I'm getting the very same thing with raytraced shadows as well :-( and I don't know what to do about it!

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