Sidenote: the author of Mitsuba is also a contributor to https://www.pbr-book.org/ https://www.pbr-book.org/, which is a great (graduate-level) introduction to

Sidenote: the author of Mitsuba is also a contributor to https://www.pbr-book.org/ https://www.pbr-book.org/, which is a great (graduate-level) introduction to this topic.