Are there any methods for detecting the light intensity on the surface of an object using cycles nodes? Ideally including light from hdri and all other sources.
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1What is the purpose? Any render contains full colour depth info before save (if I'm right). So like Matte > Luminance Key in Compositor is what are you looking for? – vklidu Mar 06 '20 at 19:52
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I was hoping to use it as a driver for automating light dependent animations like pupil dilation. Perhaps the data could be extracted from each frame before beginning the next frame using the compositor and some scripting. – BlendNoob Mar 07 '20 at 21:31
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1Hm ... from your Q I red -you'r looking for post-pro, but from this info it seems you want affect mesh or material animation before rendering, right? Please extend your Q via edit with these details (delete my gif if its wrong or too much :) – vklidu Mar 07 '20 at 22:01
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is this direction? https://blender.stackexchange.com/a/29094/2214 – vklidu Mar 07 '20 at 22:08