Hi Mike,

It is not very important. Just came up when I wanted an actual half nephroid.
I was just observing that zooming way in to a cusp point shows a hairpin turn, rather than a corner point, a result of interpcurve.
Identifying the cusp points, and ending the interpcurve there, would result in a "corner."

For example, for 3 cusps in an angle of 2 PI, the ratio of a/b = 3. Numcycles = 1/3 becomes 2PI/3 inside the js code, and yields one lobe.
Numcycles could be changed from an integerValue to numericValue.
Circular array, or 3 interpcurves would yield the full curve...


A ranunculoid has 5 cusps.

- Brian