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Thread: SSS Marble: how??

  1. #1
    Member Plakkie's Avatar
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    SSS Marble: how??

    Ok, for the first time in my life I own Fprime, and now I would like to learn a bit about the new SSS shaders in LW9.2.
    I would like to make a marble pillar (not too shiny) that has just that hint of Sub-scattering to it. (see picture) I know it can be done, I've seen it around here, but how? I tried the kappa's and omega's a bit, but until now I never got the effect I was looking for. (got a lot of weird pillars though ).
    My question to the node-masters around here: what shaders/settings should I try? Do I need those mysterious air-polygons? Do I need special lights or radiosity to see the scattering?
    Please help this node-newbee!
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  2. #2
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    Here is a quick attempt using simple skin. Need to turn on double sided in the surface editor. No air polys needed and no special lighting.
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  3. #3
    That skin marble looks really cool.

  4. #4
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    I just recently upgraded to LW9 and I'm loving the node editor. I could easily just sit here playing with nodes and neglecting everything else...

  5. #5
    Member Plakkie's Avatar
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    Thanks Bloontz! I tried your setup with some different colors, and it creates a nice effect. Takes a lot of time to render though... Thanks also for pointing out double sided... I was wandering how everyone got skin out of that material.
    It's close, but not yet the effect I'm looking for. I'm looking for the raw marble effect found in roman statues and head's. No specular and just a hint of scattering on the edges. Could I achieve that with the Skin material, or could I use a shader that renderes a bit quicker? I'll try tweaking the current setting tonight.
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  6. #6
    Dreamer Ztreem's Avatar
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    I did this marble test a while ago with the sigma material, I'll see if I can dig up a node tree from this.
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  7. #7
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    I think all the SSS shaders will probably require longer render times, a lot of calculations going on. If you want less specular there are specular and glossiness settings in simple skin. There are likely ways of faking SSS that are faster rendering, possibly with incidence gradients.

  8. #8
    The Real Homestar. Intuition's Avatar
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    Quote Originally Posted by Ztreem
    I did this marble test a while ago with the sigma material, I'll see if I can dig up a node tree from this.
    Holy smokes. That looks great Ztreem!

    Does it render faster in Fprime3?

    I am loving these marble SSS renders.
    -----------------
    KC

  9. #9
    Member Plakkie's Avatar
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    Yeah, it's true: if I want SSS I must be prepared to pay a certain price.

    Zstream: that comes very close to what I'm looking for (especially the foot of the statue). It would be great if you could dig up that node tree for us to see!

  10. #10
    Member Plakkie's Avatar
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    A quicky with Sigma shader. It has a bit more solid feeling about it, but is somehow very dark (chosen same color as before). It's hard to determain what setting changes what. Should I pick a light or a dark color for absorption? I can't tell the difference very well. Surface color must be the marble's normal color right?
    I must say the results of those shaders make pretty cool renderings already. It's fun playing around with it.
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  11. #11
    Super Member Captain Obvious's Avatar
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    Quote Originally Posted by Ztreem
    I did this marble test a while ago with the sigma material, I'll see if I can dig up a node tree from this.
    Holy balls!
    Are my spline guides showing?

  12. #12
    Member Plakkie's Avatar
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    Quote Originally Posted by Captain Obvious
    Holy balls!
    Hey! What about my shiny pillar?!

    Ztreem is stealing the show, and for a good reason. Somehow I find realistic stone much more interesting then realistic skin.
    Is that model your work too Ztreem?

  13. #13
    Super Member Captain Obvious's Avatar
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    Quote Originally Posted by Plakkie
    Hey! What about my shiny pillar?!
    I prefer the skin shader one, but I guess it's just the matter of getting the right settings. FPrime should help.


    Somehow I find realistic stone much more interesting then realistic skin.
    I agree.


    Is that model your work too Ztreem?
    It's a scanned model.
    Are my spline guides showing?

  14. #14
    The Real Homestar. Intuition's Avatar
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    I like the pillar. It needs an environment to really get the full effect but it looks really nice with the SSS marble.
    -----------------
    KC

  15. #15
    Dreamer Ztreem's Avatar
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    Thanks all, glad you like it.

    Here's a node setup, it's not exactly the same because I didn't save it.

    Note: Remeber that the absorption color should have very low values and the inverted color of what you want to see in the render.

    Edit: in the render I used the marble procedural texture not the windywave, so that would work as well.
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