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backscatter on SSS2 skin shader?

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  • backscatter on SSS2 skin shader?

    Click image for larger version

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    I'm comparing the skin shaders in vray and mental ray, and am having a hard time creating the backscatter on the ear (see above). As you can see, I'm getting a trasclucent skin color (as if the head was ivory), and not the blood-red color I would expect to see there.

    Comparing the shaders two we have:
    MR Fast Skin Maya / Vray SSS2
    diffuse / diffuse
    epidermal / sub-surface
    subdermal / scatter
    backscatter / ***

    So while in MR there is a parameter for the backscatter, there is no equivalent in the vray SSS2 shader. Given that, how would I get the vray shader to produce similar results on the ear?

    Let me add that increasing the prepass rate does seem to improve this, but I am still not getting the red back scatter I would like to see.
    Last edited by sharktacos; 21-04-2011, 02:03 PM.

  • #2
    Based on the Scale parameter and "Scatter Radius" in the SSS2 shader. Make it larger.
    Colin Senner

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    • #3
      Originally posted by MoonDoggie View Post
      Based on the Scale parameter and "Scatter Radius" in the SSS2 shader. Make it larger.
      Thanks, that's was a good tip. Actually tho, what worked was making the scale smaller. Here's a comparison again (all with a prepass of 1):
      Click image for larger version

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      I do wish that in a future version that we could have individual "artistic" control over the back scatter and subsurface effects like in the MR shader.
      In particular here, I would like to have the terminator on the face be more orange, while the back scatter on the ear would be crimson. I can of course achieve this with maps now, but having that added control would be nice.
      Attached Files
      Last edited by sharktacos; 21-04-2011, 03:30 PM.

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      • #4
        Best way to do it is with the scatter radius, don't get too much scatter on a face, it's a simple mistake to make and it looks like they're made of wax. There's a couple threads on the forums about SSS2 shader that people have done (myself included). You can control the backscatter color by changing "Sub Surface Color" and "Scatter Color".
        Colin Senner

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        • #5
          Originally posted by MoonDoggie View Post
          Best way to do it is with the scatter radius, don't get too much scatter on a face, it's a simple mistake to make and it looks like they're made of wax. There's a couple threads on the forums about SSS2 shader that people have done (myself included). You can control the backscatter color by changing "Sub Surface Color" and "Scatter Color".
          Right, I get all that. What I am saying is that the way the shader is designed it is not possible to change the scale/scatter radius of the back scatter without simultaniously changing the scale/scatter radius of everything else. Likewise, the color of the back scatter cannot be controlled independently of the overall subsurface color. I miss that flexibility, and would prefer to be able to have the option of tweaking them independently if desired.

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          • #6
            Couldn't you map it?

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            • #7
              Originally posted by JeffG2 View Post
              Couldn't you map it?
              yes exactly. You can paint a scatter radius map.
              Dmitry Vinnik
              Silhouette Images Inc.
              ShowReel:
              https://www.youtube.com/watch?v=qxSJlvSwAhA
              https://www.linkedin.com/in/dmitry-v...-identity-name

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