Basically, it seems no matter what type of light (lamp, spot, etc…) I use and the render settings I use for hair (tangent shading, surface diffuse, etc…) I get a dark spot in my hair in the direction the light source is coming from (as seen in below image). This problem has me really confused because it even happens when I turn off shadows with some light sources.
I can minimize the effect by using multiple light sources or using settings like surface diffuse or tangent shading, but I can still see the effect occurring. I’ve been looking at blend files for Big Buck Bunny to see how they avoided the problem, but I don’t see how they did it.
Is there some option I’m over looking? Or, is this is just something that naturally happens do to the normals of the hairs being perpendicular to the light source?
NOTE: The below image is showing the effect. The settings used were just default settings. The only thing I changed was adding hair to one of the balls.