Hello Brian,

you remember the CCC script. In the script is a function called csp. This function calculates the Center of a Curveseg by 3 given pointcurves. You can check it by switching the script in radius mode and set the scalefactor to 1 applied to a circle. The 3 Points you can get by using the startpoint and make a arraycurve. The script calculates the curvature / radius Center locally. If you have a circle or an arc anyway - the result is the same.

Have a nice day
Karsten