"In this case, yes, it's subtle. It's only readily apparent in the reflection of the window in the upper right quadrant of the sphere (as expected) where a small, bright, reflection of the solar disk can be seen. I'm…"
"I'll have to look to see which engines respect that switch, I can't remember off-hand. It controls whether glossy reflections get a contribution from the direct sun component. The easiest way to see it would be to create a…"