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
Hi Karl,
Nothing I guess, the Boolean hollow surface is probably buggy ;)
Are you using materials containing the line 'LightAngle=dot product(Ray,
Bump normal)' ?
Apparently, surface/bump normal is reversed for the hollow parts, it's as
if you're looking at the inside of the surface; the renderer doesn't
realize it should behave as a double-sided surface. Somehow it 'thinks'
you're looking at it from the inside. In other words, Angle gets assigned a
positive value while it should be negative.
I negated the Angle value and then the inside was rendered OK, but the
problem shifted to the outside ;)
Conclusion: avoid hollow Boolean stuff!
sorry this isn't much help,
Mark Heuymans
