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Re:PBRT in Rust by detaro on Sunday January 17, 2021 @12:50PM (#25812930)
And specifically a reference to a book, which describes an implementation: https://www.pbrt.org/
Re:PBRT in Rust by tux1968 on Sunday January 17, 2021 @01:17PM (#25813242)
And is available to read online legally here:

http://www.pbr-book.org/3ed-2018/contents.html