adsoda : Arbitrary-Dimensional Solid Object Display Algorithm - after Greg Ferrar
A 2014 save of the original ADSODA webpage: 2014_Greg_Ferrar-ADSODA.pdf. Probably written in 1999.
See an example on http://www.raktres.net/tak4d/.
2008 Factor version : https://github.com/factor/factor-unmaintained/tree/master/4DNav