Hi, this is a new test on more complex model. The subsurface illuminace will definitely blur textures and flat displacements. The coral test intergrate some cheap direct illuminance(diffuse and specular) to show the displacement.
About the render time, I have not kept an accurate record. To use this shader, you have to pre-render 7 shadow maps, if texturing is needed, you need 7 additional reference maps. All the maps are rendered in seconds and can be reused. The final render of the coral takes 4 to 5 minutes on my PIII 550 box. Direct illuminace pass rendered in no more than 30 seconds. Of cource, I take time to do color correcting in post. I think the speed is quite acceptable.
Now the shader is not ready, but you can get a test from this link:
It provide a light shader and a color function. Tutorial will be posted when the shader gets ready.
About the cloud shader, I think I should abandom ray-march for speed issue. Maybe ray-trace is a faster solution. I will try it soon.
[Edited on 29/9/2003 by zj]