bagginsbill opened this issue on Apr 23, 2008 · 2832 posts
RobynsVeil posted Wed, 24 December 2008 at 1:01 AM
Quote - > Quote - interesting.
i was watching a video for a tutorial and the guy said that a lot of times people make the mistake that the diffuse color is 100% and then they add a little of SS: he said that the SSS should be 100% since it is the color under the skin and that the skin is translucent( is this even a word) ?
by definition, translucent means that you can't entirely see through it. what most shaders for Poser don't account for is the yellow of dermal scattering, and that's not dealing with how much opacity the skin has. so no, not all of how skin looks is SSS. if it was, we'd all just look red, and you wouldn't be able to see skin surface at all. besides, what does "100% SSS" translate to physically? it doesn't make sense to decide that 100% of your light rays will enter the skin, not be reflected by the skin, not get scattered within the skin, scatter in the subdermal layer, not be absorbed or scatter in a direction not captured by your eyes, and be scattered back out to be seen by the viewer.
With skin, there are no predictible constants. As skin turgor diminishes, translucency increases. However, having seen a sheet of skin (of an individual in her 40s) during a skin graft procedure and the amount of light that falls through it, I think saying that 100% of light rays will be absorbed doesn't quite mesh with reality. Skin does have a specular aspect, particularly young skin. One could quibble on just what proportion of light is absorbed and scattered into subdermal layers and acquiring colours from the surrounding structures like adipose and connective tissue and vasculature to be the shown to the viewer as the diffuse colour vs reflected... not sure if I have all the terminology right, because to me light that is absorbed becomes invisible or becomes heat, whereas all other light is reflected light.
Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2
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