As others have pointed out, this book is incomplete (and has been for some years), though it is considered foundational by many.
A different intro I particularly enjoyed is A Journey into Shaders[0], which succinctly covers signed distance functions and leaves you with a small finished project.
Previously discussed : 555 points by superMayo on Oct 26, 2023 | 71 comments |
https://news.ycombinator.com/item?id=38032288
[0]: https://www.mayerowitz.io/blog/a-journey-into-shaders