A little demo. No it's not art. I don't need to do art to show what the big deal is with GC.

This is about accuracy. Accuracy is of interest when attempting to do something realistic. Realism is of interest when that's what you want. Please don't talk to me about whether art requires realism or accuracy. It doesn't, and I neither demand realism and accuracy nor care if you don't want to seek it. Do your own thing. Despite what some have said, I do not demand anything of your art.

But there are people who seek realism. Maybe they need to do a commercial showing a car ad, without an actual car. Maybe they just like making fantasy "photos" that cannot be done in real life. Doesn't matter why. The point is, if you're trying to show accurate lighting, and keep it simple instead of making it hard, then I try to help people understand how to do that. For people who ask me how to get more realism, I talk about GC. It's the simplest first step to an outcome that is "less wrong". Even if perfection is never achieved, less wrong is better than more wrong. By wrong I mean in the sense of physics, not art.

I also help with toon shaders, Vargas airbursh effects, and other forms of art. In those cases, I do not talk about GC.

This image done with:

PPro 2010, one spot light with inverse square falloff and IDL, but no GC.

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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)