#http://www.mathcurve.com/surfaces/catenoid/catenoid.shtml

vertices = D1:360 D2:100


u = from (-PI) to (PI) D1
v = from (-PI) to (PI) D2

a = 10.0

x = a*ch(u+v)*cos(u - v)
y = a*ch(u+v)*sin(u - v)
z = a*(u+v)
