Compute normal based on luminance value.
LumaToNormal
First submitted: 15 June 2012
Author: lucien Fostier
Website: https://lucienfostier.com
Compatible Nuke versions: 6.3 or later
Compatibility: Linux, Windows
This gizmo use luminance to compute a normal using a derivative method.
It works best very low grain image.
Used in production for relighting and displacement.
Feel free to contribute.
Computation a bit slow to my taste.
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