Why are we using 4D to create 3D?

Something different this time! Let's take a look at why 3d rendering actually uses 4x4 Matrices and 4d vectors.
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
01:29 - Aren't 3 dimensions enough?
02:52 - Using only 3x3 Matrices
06:07 - Translating a Point in 3D Space
08:03 - Introducing a 4th Column to the Matrix
12:31 - The w Component of the Vector
16:27 - Outro
#3d #rendering #engine

[@cuserroro]

schön erklärt. Danke!