Lissajous Celtic Knots

D Moews sent me a program that calculates Lissajous knots. The program prompts for input parameters and outputs Lissajous knots as stl files. The cross over ordering of the knots can be specified and the program was used to make two knots which are Celtic as well as Lissajous. Lissa_98_celtic.stl is shortened in the vertical direction so as to serve as an ornament or brooch. It resembles a Celtic panel.

See the fortran souce code and the list of input parameters.