This shape filling curve method probably isn't what you're thinking of either, but it's neat and similar to the OP linked paper in 2D: https://news.ycombinator.

This shape filling curve method probably isn't what you're thinking of either, but it's neat and similar to the OP linked paper in 2D: https://news.ycombinator.com/item?id=25905534 https://news.ycombinator.com/item?id=25905534 & https://www.vidarholen.net/contents/blog/?p=1062 https://www.vidarholen.net/contents/blog/?p=1062