Free software and open source codes written or supported by Frank C Lanngbein.

Twisted Eight
LiLit is a program to visualize functionals on freeform surfaces. It uses biquadratic g-splines to display surfaces and functions, which are defined by a control mesh for the surface and the function from some file in a special input format. It can run the Doo-Sabin subdivision algorithm on the control […]


PIDS is an algorithm for simplifying mathematical expressions, implemented in emacs lisp. pids-1.0.tar.gz – PIDS Version 1.0. If you use this code please cite