- The chapter05/scenediffibl.cpp file in the example code
- Physically Based Rendering, Third Edition, by Pharr, Jakob, and Humphreys
- The Using gamma correction to improve image quality recipe in Chapter 6, Image Processing and Screen Space Techniques
- For lots of details about the specular contribution with image-based lighting, see http://blog.selfshadow.com/publications/s2013-shading-course/
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