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I'm not very familiar with computer graphics.

Currently I'm reading a paper "Image-Space Horizon-Based Ambient Occlusion - Louis Bavoil, Miguel Sainz, Rouslan Dimitrov"

Here's the problem

In the first paragraph they state general form of ambient occlusion illumination and mention that V is a function, that equals 0 if no occlusion and 1 otherwise.

And in the second paragraph they expand it to cosine.

paper text

I can't find any explanation about how it happens. Does anyone know how did they do it?

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migration rejected from stackoverflow.com May 27 '13 at 22:48

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closed as not a real question by TMM, Ittay Weiss, Amzoti, Chris Godsil, Asaf Karagila May 27 '13 at 22:48

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