mcz wrote:The punct light is suerly wrong. Pherhaps an emitter with a semi-cilindrical shape could replace the two lights.
I have no idea what a surface scattering ist and what for effects it has. But I can try it and have a look on what happens.
Maybe you could try just replacing the point light with an area light (even a simple rectangle should do I think) just to soften a bit the shadows. I think the spot can maybe stay as it is.
Subsurface scattering is a feature that is still missing in luxrender. Here is a (I hope) simple explanation applied to skin:
- when light arrive on skin, part of it is directly reflected but part of it goes through the skin
- light going through the skin will then meet organic material like fat, flesh, blood that will absorb part of the light or reflect (scatter) part of it in various directions
- light will then eventually reach the skin again and go out, but at a different place than it entered the skin and with a different color
This is the reason of blush when you have emotions (you see more blood through the skin) and that's why you can see light through your hand in the dark (or get a funny face by putting a torch under it
). It is also the reason why shadows are usually really soft on skin: even if there is an abrupt change in light intensity, part of the light will enter the skin and go out in the unlit region.