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Seam Issue - Came up before...

jeff_someonejeff_someone Posts: 254
edited March 2020 in Daz Studio Discussion

Anyone know why I get these seams at the intersection of UVs when using HDRI/environment lighting with characters?  Also, if it matters, I have the skin shader set to use SSS and this seems (not pun intended) to be part of the issue.  I know this topic came up before but for the life of me I could not find it using the search Forums feature.  As a bonus, if anyone knows how to fix this issue it'd be super appreciated.  Thanks!

 

Post edited by jeff_someone on

Comments

  • jeff_someonejeff_someone Posts: 254
    jeff_someone said:

    Anyone know why I get these seams at the intersection of UVs when using HDRI/environment lighting with characters?  Also, if it matters, I have the skin shader set to use SSS and this seems (not pun intended) to be part of the issue.  I know this topic came up before but for the life of me I could not find it using the search Forums feature.  As a bonus, if anyone knows how to fix this issue it'd be super appreciated.  Thanks!

     

    Well some more research... this effect does not happen when I turn Transmitted Distance to 0...so that has something to do with it... 

  • Richard HaseltineRichard Haseltine Posts: 108,327

    Is part of the leg or torso made invisible in any way?

  • ParallaxCreatesParallaxCreates Posts: 489

    This also seems to only happen when using Spectral Lighting so that's something to take into consideration. I have also come across this, though only when Spectral lighting is ON but not with all skin textures/settings.

  • jeff_someonejeff_someone Posts: 254
    ParallaxCreates said:

    This also seems to only happen when using Spectral Lighting so that's something to take into consideration. I have also come across this, though only when Spectral lighting is ON but not with all skin textures/settings.

    Hmm ok let me fiddle with that and see if it makes a difference for me... thx

  • jeff_someonejeff_someone Posts: 254
    Richard Haseltine said:

    Is part of the leg or torso made invisible in any way?

    No, no parts are hidden.  Looks to be something funky when doing transmitted SSS between seams in general...  but only when using environment lighting.  If I turn off all environment lighting and just use Photometrics lights, then i do not have this issue.  Weird...

  • jeff_someonejeff_someone Posts: 254
    jeff_someone said:
    ParallaxCreates said:

    This also seems to only happen when using Spectral Lighting so that's something to take into consideration. I have also come across this, though only when Spectral lighting is ON but not with all skin textures/settings.

    Hmm ok let me fiddle with that and see if it makes a difference for me... thx

    Ok, so as ParallaxCreates recommended I turned off Spectral Rendering and sure enough that fixed it.  Thanks much Parallax!!  

  • ParallaxCreatesParallaxCreates Posts: 489
    jeff_someone said:
    jeff_someone said:
    ParallaxCreates said:

    This also seems to only happen when using Spectral Lighting so that's something to take into consideration. I have also come across this, though only when Spectral lighting is ON but not with all skin textures/settings.

    Hmm ok let me fiddle with that and see if it makes a difference for me... thx

    Ok, so as ParallaxCreates recommended I turned off Spectral Rendering and sure enough that fixed it.  Thanks much Parallax!!  

    You're welcome! 

  • Leonides02Leonides02 Posts: 1,379

    A shame we need to turn off a feature to make this work! I wonder what the seams are all about. There is mention of them all over the forums, but nobody seems to know why or how to fix it (other than don't use Spectral!)

  • skboaskboa Posts: 61

    I've had this problem several times since I'm using SSS and Spectral rendering almost everytime. I've read somewhere that this is an Iray bug, but I don't remember where. The only real solution I found so far is, as mentioned, turn of Spectral rendering, BUT using low "... Measurement Distance" values helps too. The seams disapear completely if both values are zero, so you can make them at least barely visible with lower values.

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