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Image maps for subsurface color don't do anything?

aaráribel caađoaaráribel caađo Posts: 686
edited December 1969 in Technical Help (nuts n bolts)

I was trying to fine-tune a skin shader set-up (oh, the trial and error and error and error) and put a jpg with color bands to help me narrow down the color I wanted to use in the subsurface color channel. The color disappeared. I thought it might have blended the bands, so I set the diffuse to 100% white and put in an image that was half bright green, half blue (diagonal)—so I'd see the color right away. Absolutely no color influence.

SSS is set to 50% (50% diffuse) and if I have a color set, shows up. (Top image is with the diagonal green/blue map; bottom is with a 189-121-77 color set).

I'm using the omHumanSurface shader.

SSS_without_a_map.jpg
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SSS_Maps_dont_do_anything.jpg
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Comments

  • SzarkSzark Posts: 10,634
    edited December 1969

    What are your settings for SSS like, for example SSS Shading rate and SSS Scale? Plus 50% SSS may not be high enough when using maps. Shading rate as this close should be around 2.00 and Scale for the size of figure around the 4.00 mark. Also what lights are you using and how many?

  • KhoryKhory Posts: 3,854
    edited December 1969

    Also, did you change the sss from skin 1 or 2 to something that does not already have pink tones like marble or milk?

  • SzarkSzark Posts: 10,634
    edited December 1969

    Ubersurface Khory ;)

  • KhoryKhory Posts: 3,854
    edited December 1969

    Oh piffle! In that case I suggest a shader change for better/stronger effect. The AoA I know can do it properly.

  • aaráribel caađoaaráribel caađo Posts: 686
    edited December 1969

    The attached image shows my SSS settings. I'm also attaching a render with the map and one without, but with the green color from the map put into the subsurface color channel. It's clear the SSS is very, very active, but ignores the map. Or maybe is being turned off by the map—there doesn't appear to be much SSS going on to my eyes.

    I've got two active lights: a main regular (from the Create menu) spotlight at 100% (from the front left) and another spotlight almost directly behind the ear set at 200%. The front one casts soft raytraced shadows.

    These renders, made after saving and closing DS, have problems with the teeth. In earlier renders, with the same settings (except the skin diffuse and subsurface colors), the teeth rendered properly. Here, they're not getting SSS. SSS seems very fragile to me—small changes in settings have huge effects I can't predict.

    I'm definitely feeling lost right now. Ideally, I want to get a skin that's 50% or more SSS, but getting everything balanced is proving super hard.

    Why_Green_no_map.jpg
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    Why.jpg
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    Screen_Shot_2014-12-15_at_3.26_.52_PM_.png
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  • SzarkSzark Posts: 10,634
    edited December 2014

    Well I am not sure why it isn't working. I tried those settings and it is working for me BUT I did notice something strange which I will have to fill in a bug report for. It can render SSS and then it won't. So I closed down DS and reopened the file and the SSS showed in render again.

    First image has just SSS no diffuse, spec or velvet just SSS with a coloured map in the SSS colour channel

    the second image has a map similar to yours applied to the SSS colour channel

    test2.png
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    ussssTEST1.png
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    Post edited by Szark on
  • aaráribel caađoaaráribel caađo Posts: 686
    edited December 1969

    Wow, the difference between your top image and my similar settings image is so striking. Did you set the diffuse amount to 40% or 50%? My renders produce more of an effect of something coming through the top layer than yours do, at least to me.

    The SSS working and then not has been a problem for me, but I never knew if it was due to some small change in settings. Having a bug report is reassuring. Thanks

  • SzarkSzark Posts: 10,634
    edited December 1969

    No diffuse, it was turned OFF

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