The Ray Tracer Challenge - 026 - Pattern in Yaml

Let's add support for the definition of Patterns to our YAML world loader. This will allow to define patterns on the cli as well as in our REPL.
Join me, while I implement chapter by chapter from the book "The Ray Tracer Challenge" by Jamis Buck in Rust a language completely new to me.
Come with me on the journey of learning the Rust programming language, while implementing a Ray Tracer in a Test driven fashion, to have fun and (hopefully) create some astonishing rendered graphics.
Let's study the inner workings of a Ray Tracer, and take a look under the hood of the Rust language, while taking on this challenge on a weekly basis.
All the code produced within this series is provided on github, for you to
follow along.
Github: github.com/jakobwesthoff/the_...
The Ray Tracer Challenge (affiliate): amzn.to/3xVssbR
Rust: www.rust-lang.org/
Contents
00:00 - Intro
02:32 - Implementing Yaml Pattern Parsing
03:13 - Defining the Yaml Structure
05:38 - with_pattern Builder Function
07:40 - Visit the structure and parse it
26:40 - Trying the Parser for a Spin
27:35 - Creating a Scene with a Pattern
29:59 - Committing the Changes
33:05 - Rebuilding the REPL with Pattern Support
37:06 - Recap / Outro
#raytracer #rustlang #yaml

[@FPChris]

How did you calculate the cofactors for a 4x4 matrix on page 38? I'm stuck. The book only showed how to do 3x3's. He gets to the 4x4 and never explains how!