![]() ![]() The human eye can look at a read scene like this and see whether there is any red light on the background because it's seeing light that has completed it's move (at the mere speed of 186,000 miles per second). The image below was taking an extremely long time to render probably related to the fact that the engine was checking all vectors between the light (behind the dragon) and the backdrop. That said under some conditions layering rendered images can be a good approach especially for comics. The first will not preserve the interaction among elements as shadows and reflections, also doesn't allow depth effects since there's no z-buffer, also doesn't allow to retarget lights or tone mapping since it's not HDRI. Layering rendered images with a paint program, and compositing render layers with a compositor. You are confusing two very different things.
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