surface of revolution
// create a Surface of Revolution shape (like lathe, but faster)
sor {
7, // # of points
<0.000000, 0.000000> // list of <u,v> points
<0.118143, 0.000000>
<0.620253, 0.540084>
<0.210970, 0.827004>
<0.194093, 0.962025>
<0.286920, 1.000000>
<0.468354, 1.033755>
// [open]
}