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Thread: Hair material question

  1. #1
    Super Member Kryslin's Avatar
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    Hair material question

    A quick question:

    The two new hair materials, Principled and AFC Hair are both considered dielectric materials, and as such, can have surface sampling overridden by the new optimization overrides.

    Does the same hold true for the original hair material as well?
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  2. #2

    Yep.  

    that said, definitely check out Principled and AFC
    nice shaders.

    and Principled Hair is Very easy to control
    Last edited by erikals; 04-25-2020 at 12:13 AM.
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  3. #3
    pass:sword OFF's Avatar
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    Principled are ~twice faster.

  4. #4

    Principled are ~twice faster.
    really? hmm, gotta check!  
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  5. #5
    Super Member Kryslin's Avatar
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    Considering my hair and fur tends not to need the surface variation provided by the hair shader, I'll have to set things up with the principled shader.

    *edit*
    Well, I've managed to get render times down from 8m to 3m (800 x 800), and not have the noise break up the hair and other surfaces. Now, it's just a matter of getting the wash out under control - the colors of the fur washes out pretty easily with the principled shader. More experimentation is needed, but I'm liking the decreased render times.
    Last edited by Kryslin; 04-25-2020 at 08:02 AM.
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  6. #6

    Principled are ~twice faster.
    nah, i'm getting the opposite, twice slower, for 1 of the FiberFX scenes at least.
    but they (Principled/Regular) behave quite different, so not quite fair of a comparison.
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  7. #7

    slight differences in 2019 vs 2020

    haven't tried to tweak it yet. (standard hair shader)

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  8. #8


    nah, seems to be the same-ish rendertime, bit longer actually from 2019 to 2020... maybe...

    anywayz, adding an AFC test...



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  9. #9
    Super Member Kryslin's Avatar
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    The one on the left was rendered in LW 2019.1.5 @ 7m57s. back in Feb 2020, just before COVID-19 became news.
    The one on the right was rendered today, using LW2020, and taking advantage of the per surface sampling overrides. Render time was 2m38s. I managed to cut scene level AA samples by half.

    This is with the normal hair shader, BTW. It's nice to see at least two feature requests made it in - One for a way to give FFX extra samples, and the principled hair shader.
    (Lighting is with an environment light. I managed to drop light samples by 1/3rd, and Background samples by 1/4th there, too).

    Once I've got a few other things out of the way, I'll run some other tests. I've got one fur heavy scene that's a pretty good stress test.
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  10. #10

    cool, i like the 2019 one, the 2020 one is alright also, but more washed out, slighty more tweaking is needed. (probably)

    interesting in regards to rendertimes...  

    guess we'll need some weeks to draw final conclusions.   
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  11. #11
    Super Member Kryslin's Avatar
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    It's probably my settings in general. I personally like the 70% reduction in render time I can get.

    *edit* It appears the shaders are a little more sensitive to highlights and specularity. I reduced each a little bit, and got things closer to the 2019 image. Also cut 8s off the render time, too.
    Last edited by Kryslin; 04-25-2020 at 10:33 PM.
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  12. #12

    *edit* It appears the shaders are a little more sensitive to highlights and specularity. I reduced each a little bit, and got things closer to the 2019 image. Also cut 8s off the render time, too.
    cool.  

    ...more sensitive to highlights - yep, seems so.
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  13. #13
    RETROGRADER prometheus's Avatar
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    https://hairtheme.com/hair-cuticle/

    In blender principle hair nodes, there is not direct value controller called "cuticle" though it is controlled by a value called offset..

    "Offset
    Tilts the glint of the hair by increasing the angle of the scales of the hair’s cuticle with respect to the hair shaft. Human hair usually has low values.
    "

    If any of that could translate over to the new Lightwave hair shaders.




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