I have a lighting problem in my scene:
I have an earth model (several nested spheres with different images unwrapped on them), as well as a sphere weakly emitting far away (to provide the visual sun in the render), and a sun lamp to provide the real lighting of the earth.
Here’s the problem: whenever the sun lamp is rotated to within ~45 degrees above or below horizontal, the earth is unlit, then there are a couple degrees where it fades in, and outside that range it’s full brightness. I’m working in cycles, and observed this when in render view, as well as when I actually rendered a frame.
Any ideas? If I haven’t given enough detail, please let me know.