Doing some reading, I seem to be mixing this up with https://gamedev.stackexchange.com/questions/72044/why-do-we-use-4x4-matrices-to-transform-things-in-3d http

Doing some reading, I seem to be mixing this up with https://gamedev.stackexchange.com/questions/72044/why-do-we-use-4x4-matrices-to-transform-things-in-3d https://gamedev.stackexchange.com/questions/72044/why-do-we-.... The later bit I understand, but I think it shows I don't really get what this article is all about. I'll have to read it further. Thank you :-)