Otherwise, it adds vertices to the longest edges. A N set the level of Antialiasing. N is between 1 and 255. Higher antialiasing level will make the picture look smoother, but the rendering will be very slow if antialiasing is on. The program will delete a vertex only if it does not change the knot type.
N can be real number.
If pinch force is turned on, the program will try to pinch this edge to a point in order to remove a vertex. P N set Pixel per inch when saving the knot picture as a postscript file. Default is 150. N run the energy minimizer N times. N smooth the knot.