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I find the methods for combining the layers fairly straightforward in that they are the methods I would have used myself if, working alone, I to come up with a way of combining the separate passes, but I find myself wondering...
Is screening the light contribution (or even simply adding it) really what goes on in the renderer? I haven't tried to reverse engineer it to see, but somehow I imagined something more exotic might be happening.
How much are these blend modes an approximation to what 'really' goes on in an unbiased renderer?
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