Hack-A-Day, Day 03: Hack-A-Voxel.
Today's project was to write a 3D renderer from scratch. All it can display is voxels. Try it online here
This one ran long -- I actually worked on it 3 different days. In the end it works so-so. It doesn't look perfect and it's slow on big scenes. But I learned things pretty thoroughly working on it.


