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Weird backlighting on transmapped hair

SnowSultanSnowSultan Posts: 3,777
in The Commons

Does anyone know why this effect (shown below) happens often with Iray lights that shine from the back? I just bought the Painters Lights and many of them do this to transmapped hair. I don't want to return it, but this is too hard to postwork away.

 

Comments

  • DustRiderDustRider Posts: 2,880

    Looks like the translucency to me, try turning the translucency down a bit. It looks pretty close to what I would expect in the real world with strong back lighting with lighter hair colors though.

  • Serene NightSerene Night Posts: 17,704

    Yeah, happened to me too with Darius's hair and that light set. Ended up having to take it into photoshop and darkening that with a new layer to get rid of it.

  • SaiyanessSaiyaness Posts: 715

    I either put the colour maps into the translucency colour channel, or like DustRider said, turn down translucency. :) I find myself needing to do it with AprilYSH hairs (depending on lighting, of course). :) 

  • mjc1016mjc1016 Posts: 15,001

    I'm pretty sure it's a problem with the hair and not the lights.

    Check for things like both translucency and SSS...both are not needed.  Also, if the transparency maps are not GREYSCALE (as set in an image editor), the chances of having an embedded color profile affecting things are high.  In effect, it turns them from opacity masks to translucency maps.

  • SnowSultanSnowSultan Posts: 3,777

    I turned absolutely everything off that Iray added and the glow didn't go away. I swear, I'm this close to giving up this hobby. Thanks for the help, I'll just use lights that don't do this.

  • seeker273seeker273 Posts: 449

    I think I've read something about it before. I can't find it but I believe it was a problem with the lights. If the light had geometry other than point it gave this effect.

  • ArtiniArtini Posts: 10,313
    edited December 2016

    I also think, it is the problem with lights, I usually move the upper light a bit, and that fixes the problem.

    Many of lights sets suffer from this, especially Elianeck ones.

     

    Post edited by Artini on
  • j cadej cade Posts: 2,310

    Ooh! I have visuals for this. So, photometric lights have a little switch to make them invisible to the camera. This works great until the light goes behind something with cutout opacity or refraction, for some reason the invisibility thing doesn't work when its behind something transparent

     

    First image is the error

    second is everything the same but the photometric light set to "render emitter off" to show more clearly how the error coinsides with the boundries of the light if it were visible

    third is the light slightly repositioned. Easiest way is to set your main viewport to the problem light and zoom out a bit and/or pan up a hair

    4th is just the light rehidden again

     

    Its fairly annoying and probably a bit of a bug with photometric lights (you can make light emmiting plane meshes invisible and they stay invisible behind transparent objects for instance)

    transparency error.png
    1839 x 960 - 764K
    transparency error2.png
    1849 x 964 - 696K
    transparency error3.png
    1849 x 957 - 386K
    transparency error4.png
    1841 x 956 - 405K
  • ArtiniArtini Posts: 10,313
    edited December 2016

    Thanks for the explanation, j cade. So the white on the hair is a badly hidden photometric light mesh, then.

    I have not noticed, that photometric light has the setting of "render emitter off" - it will simplify positioning, if one set it to "on".

    Great tips.

     

    Post edited by Artini on
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