Physically based materials

These two articles are very well written.

Learn about physically based rendering in Arnold
https://docs.arnoldrenderer.com/pages/viewpage.action?pageId=142402201

How to tell if a PBR lighting model is physically based?
http://imgtec.eetrend.com/blog/2021/100113404.html

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Origin blog.csdn.net/fdbvm/article/details/123494535