OP's link is a good one, but if you want a different perspective (heh), there's https://gabrielgambetta.com/computer-graphics-from-scratch/i..., also from scratch, also for free. The name clash is unfortunate, I don't really know who started using it earlier :(
Good show, this is how I recommend doing it and have been teaching it for years.
It's quite unfortunate that basically everyone thinks 3D graphics necessarily implies rasterisation and using someone else's API, and I feel extremely lucky to have taught myself in a time when you could trivially display images by direct memory access (mode 13h), and to have focused on ray tracing instead of rasterisation.
if you are looking for a resource for this, I did this exact thing last year through pikuma that man is the best software teacher online I have come across. Highly recommend his 3D software renderer course.
