Hi
I have been using custom shading for some time (to fake Oren Nayar for
speed), and I'm not sure if this problem has existed forever or just
occured. What I do is this:
1. Recreate diffuse shading with VSL, adding only curve control. I guess
everyone has done this.
2. Create an analytical sphere, which is cut in half by a cube, making it
a hemisphere.
3. Set the analytical sphere to hollow and put a lightsource inside it,
just to make sure lighting is done correctly, to illustrate this point.
When rendered without the material, only the inside is lit as expected.
Applying the material will render it all black? Messing semirandomly with
angles within the material I can get both the inside and outside to be lit
or unlit, but not only one side. What is going on here?
If I make the sphere non-hollow and cut it with a smaller sphere, it
renders correctly again.
The weird thing is, the Oren Nayar material renders properly, so I guess
I'm missing some important steps. Problem is I'm not able to read all that
weird stuff that is happening in the ON material.
Anyone have any ideas what I'm doing wrong?
Karl
