My first video on spherical floors became outdated, so I've redone it: https://www.youtube.com/watch?v=ssVGL6nYWak&index=4&list=PLEn4T1_OqQNNyxkPuLtgPk5oa3-_wpufv&t=5s

I'll probably delete the old video shortly, since I can't reupload it. The process is the same, but with fewer steps now, so the video's probably not even necessary.