You set resolution=0.01 and send it to fac(n=0.01) which never reaches the ending condition of n==0 inside fac(n). ----- $ Runsun Pan, PhD $ libs: doctest , faces ( git ), offline doc ( git ),runscad.py( 1 , 2 , git ); $ tips: hash( 1 , 2 ), sweep , var , lerp , animGif -- View this message in context: http://forum.openscad.org/Nth-degree-Bezier-Recursion-tp14302p14305.html Sent from the OpenSCAD mailing list archive at Nabble.com.