Doc talk:Manual/Materials/Properties/Subsurface Scattering

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Hi Roger,

Thanks for adding this to the manual. I found the explanation of the options to be inaccurate though. - The jello explanation for the scale parameter is not correct. it does not control how much SSS occurs, but how far light scatters. This is not the same. - The radius does not control absorption. - I've changed the error explanation to more clearly indicate that errors are useful for previews. When errors show it is really ugly, not just less accurate. - The tex option does not control how much the texture affects scattering. It controls how much of the texture is scattered. - Backscattering is not the effect of light coming in from the front and then bouncing back.

I also added that SSS in Blender is diffuse only, it does not depend on the viewing angle. I think the explanation for the individual presets is not needed, it feels like this text was added just to add something..

Thanks, Brecht

Hi again,

I appreciate the work you do on this, but the example isn't correct. The SSS color is not the color of the inside of the object, the SSS implementation does not simulate the material having a different color under the surface at all, the SSS color affects the surface color and the scattering behavior. I think a simple white material with a skim milk preset shows the effect better - the SSS is not so much about internal color as it is about the way shading is softened and different color channels scatter with different radius. Brecht 00:27, 4 June 2007 (CEST)

Hi Roger,

SSS does not use raytracing at all. It uses a lightmap from the front and the back of the object. Enabling or disabling raytracing should have no effect, unless it is being used for something else. Brecht 20:26, 6 June 2007 (CEST)

I've tried to consider all your suggestions and edited the section. I hope it is correct now. I'm not sure how to proceed with the grapes example, I think it is to complicated and doesn't show the effect really well. --Soylentgreen 17:19, 17 June 2007 (CEST)

I'm not to comfortable that I have edited this section so much, so I have to apologize at Roger for not asking him first. I feel it's sometimes hard if you find your articles to be edited very much, especially because Roger had only the Release Notes to build upon. Sorry for that! --Soylentgreen 17:18, 18 June 2007 (CEST)