Are you looking for thorough guides to PBR?
Are you looking for thorough guides to PBR? Physically Based Rendering: From Theory To Implementation is a book that describes both the mathematical theory behind a modern photorealistic rendering system as well as its practical implementation. Basically, the book explains ideas and software that can help you design and employ a full-featured rendering system for stunning imagery. Do you the best thing? It is free!
The book is written by Matt Pharr, Greg Humphreys, and Pat Hanrahan who got a 2014 Academy Award for Scientific and Technical Achievement from the Academy of Motion Picture Arts and Sciences for the knowledge shared in the first and second editions of the book this book. The Academy described the book as a “widely adopted practical roadmap for most physically based shading and lighting systems used in film production.”
The full contents of the third edition of the book are now freely available online, so what are you waiting for?