For posterity.
Everything here is for the quake mod slide and gathered from around the internets.
https://web.archive.org/web/20150626221347/http://singe.telefragged.com/slide/index.html
This isn't my code, I'm putting it up on github because I don't want it all to disappear from the internet.
If you wrote any of this and want it taken down, let me know.