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The chapter04/scenepbr.cpp file in the example code
An excellent explanation of the mathematics behind PBR models and other information from the SIGGRAPH 2013 conference at http://blog.selfshadow.com/publications/s2013-shading-course/
The wonderful book: Physically Based Rendering by Pharr, Jakob, and Humphreys, currently in its third edition

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OpenGL 4 Shading Language Cookbook - Third Edition by David Wolff

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