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Thread: Glitter in skin shader ?

  1. #1
    Not doing nothing.... Tranimatronic's Avatar
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    Glitter in skin shader ?

    Can anyone explain what I am doing wrong with the GI/skin shader?
    I have this ugly (completely unintentional) glitter effect going on that I want rid of.
    I removed the spec, gloss, frenel, bump from the shader itself and it still was there.
    I uppded the light shading samples to 6 each and although bertter, they are still there.
    Also posted my GI settings and a closeup. Any pointers appreciated.
    Cheers
    T
    Antialiasing min2/max4
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    Glitter:
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    GI Settings
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    Render Globals:
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  2. #2
    Super Member spherical's Avatar
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    When you learn what caused it, please make sure to let us know, so we can do it on purpose.
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  3. #3
    Vacant, pretty vacant pinkmouse's Avatar
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    Indeed. Perhaps LW actually knows that she's off for a night clubbing with the girls.

    Have you tried upping the AA? I'd give 4/16 a go and see if that helps.
    Al
    "I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while." Charles Fort

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  4. #4
    Goes bump in the night RebelHill's Avatar
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    They're hot "pings" from your HDR backdrop... usually from reflection... you sure you've turned all reflective properties to 0?
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  5. #5
    Space Monkey 3DGFXStudios's Avatar
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    Your AA settings are a bit low. Make sure your adaptive sampling threshold is set to some thing really low like 0,003.
    Sometimes the use gradients option causes art effects. The RPE value is also pretty low but I don't think that is the problem here.

  6. #6
    oh corks
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    (Can we see what your settings are in the camera tab?)

    Other than that, standard problem solving:-
    Load the scene, get rid of the hdr. Render (limited region = happiness). See what's changed.
    Clear scene, load again, this time leave the hdr there and delete the lights. Render. See what's changed.
    If neither of those two gives any hints, then it's time to start knocking out one thing at a time in the surfacing. Eventually the speckles will go away, and you'll know they were being caused the thing you just changed.

    Generally, something will start to blow out when it's picking up too much light or reflection. It's usually a question of looking at all your numbers and working out what adds up to what.

    I know this is straightforward, but sometimes straightforward can help.

  7. #7
    Goes bump in the night RebelHill's Avatar
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    Quote Originally Posted by 3DGFXStudios View Post
    Sometimes the use gradients option causes art effects.
    Ah... just noticed that... Not sure if its to blame here specifically... but DONT use gradients with the v11 US/AA system.
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  8. #8
    Not doing nothing.... Tranimatronic's Avatar
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    Thanks for the suggestions guys !
    I increased the RPE to 192 and the glitter is still there.
    Using area lights, there is no 'glitter', so it's definitely something to do with the HDR. I had to reduce the imageWorld intensity to 50%, as everything was overly bright when swapping between regular lighting and image based lighting. (is this normal?)
    I thought I had removed all spec, gloss and fresnel (I set them all to 0 in the material. I MAY have had some set in the surface panel). I will try again tonight.
    The gradients sounds promising. I will try that.

    pinkmouse: I had no idea he was a she. Now I'm going to have to do a lipstick shader....
    Last edited by Tranimatronic; 10-21-2013 at 12:16 PM.

  9. #9
    I believe you're witnessing fireflies, meaning difficult of AA to "blur" a very bright sample. My 2 cents suggestions for your tests:

    A - Turn on Limit Dynamic (CTRL+F8) and set the Range Maximum value to what suits you better between 1 and 3. 1 might fix it, 2/3 might still fix it but also give you more range to play in post. Or clamp your HDR in Photoshop.

    B - Blur the HDR a lot.

    Good Luck
    Last edited by probiner; 10-21-2013 at 02:44 PM.

  10. #10
    Vacant, pretty vacant pinkmouse's Avatar
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    Quote Originally Posted by Tranimatronic View Post
    pinkmouse: I had no idea he was a she. Now I'm going to have to do a lipstick shader....
    Carpaint might be a good start
    Al
    "I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while." Charles Fort

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  11. #11
    Not doing nothing.... Tranimatronic's Avatar
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    ...and the winner of today's "ill buy you a pint if I ever see you at siggraph" competition is....
    all of you.
    Limited dynamic range - that brought the glitter down to just 'very much brighter than their surroundings' instead of 'holy mother of god' bright
    removed gradients, upped the RPE (doubled it) and changed the AA to 6min/12max.
    I also dropped the HDR intensity to 38% (from 50)

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    To recap if you WANT a glitter effect, put your HDR through a brightness/contrast in PShop, drop your RPE turn off limit dynamic range

    Render times went from 2 minutes to 7 so I wont be doing many at this quality
    Thanks again (and I mean it about the drinks at siggraph)

    T

  12. #12
    Electron wrangler jwiede's Avatar
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    Glad you got it worked out, useful info. Also, really liking the female albino hairless jackelope!
    John W.
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  13. #13
    Not doing nothing.... Tranimatronic's Avatar
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    Thanks!
    Actually it poses a problem. Up until yesterday she was male, and I was going to attempt the voice myself.
    Now shes female I'm going to have to ask someone to be my "female albino hairless jackelope". I'm not too sure how that will go over with the wife.....

  14. #14
    You could try using voice changing software, to turn your voice into female. She's not human so it might work, it could also be funny.

  15. #15
    Siggraph!? What? Just send it through the mail to Portugal

    Glad you sorted it out. I don't see a sex in it, it's just an entity to me

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