Curve smoothing. Chaikin's algorithm and Jarek's tweak etc. Very clever and nice way of making angular geometry curvy. Constructive geometry stuff.
There were like a dozen algs. I kept links to nice papers with diagrams. Then they started disappearing. Now I'd be pressed to find 2.
This is really useful info that is apparently disappearing. So yes, it happens, and maybe you should save that stuff.