ghostship2 posted at 12:00AM Sun, 27 December 2020 - #4408695

@hborre I think the separate RGB node is used to separate skin from eyebrows and pubic hair on the map. you don't want SSS on hair parts. you take the red portion out and use that to drive the SSS. This is why I use a natural map on face and body so that tattoos are included as skin.

But assuming you don't have tattoos to worry about (or use a separate map without them), doesn't the ScatterDistR_mm input on the PhysicalSurface root node already only look at the red channel? Isn't that the point of having separate ScatterDistR_mm, ScatterDistG_mm, and ScatterDistB_mm inputs with their own parameters?

If the answer is "we don't trust that the ScatterDistR_mm input is correctly only using the red channel", I accept that. It just looks redundant to me to separate out the red channel and then feed it into an input that I think is only going to look at red anyway. It's also possible I misunderstand what ScatterDistR_mm is doing. But after teaching myself Poser for many years I've accepted that there are people who actually know what they are doing and I should try asking them. :)