You got it Anthanasius. The big advantage to this technique is it is the proper way to see your render, so you can actually tell what you are doing.

For example, without GC, you could place a fill light to help a certain part of the figure's with dark colors and you have to turn it up pretty high. But then you notice that this fill light is illuminating the figure's skin too much. How can a light simulatneously be the right amount and too much? The answer is you need to GC, not to fiddle with lights.

There is a thread right now asking about how to make a light shine on some things but not shine on others, even though they are both in the path of the light. Guess why this person is doing this? You got it, they are not gamma correcting. Which means the perceived error on some items in the scene is higher than others, and no single setting of the light is perfect, so they want to turn on and off which things are lit. Basically, instead of using GC on this scene, the person is wanting to set up several lights FOR EACH OBJECT IN THE SCENE.

Ridiculous.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)