I have a wall with a diffuse material on it with a blank diffuse color and a texture in the opacity channel that makes slats (which let sunlight come through and hit my objects).
There is no problem except when I make the diffuse color perfect black. In the picture with the bright lines on the object (#1), the diffuse color is just 0.001 brightness above black, but it works perfectly. The one with the low contrast lines (#2) is when the diffuse color is exactly black. I find it especially weird that the light coming through from the slats is the same brightness, even though the object is experiencing a different light.
I am rendering in DL kernel.
Now this isn't something that's holding me back from my work, especially since the workaround is extremely easy and has no negative effects... but it is something that maybe needs to be addressed.
