vertices = D1:72 D2:72
u = from 0 to (2) D2
v = from 0 to (2*PI) D1

a = rand2(0, 2*PI)
b = rand2(0, 2*PI)

c = sin(v)
d = cos(v)

e = sin(b)
f = cos(b)

g = sin(a)
h = cos(a)

x = f*h*d - f*g*c + e*3
y = g*d + h*c
z = -e*h*d + e*g*c + f*3

x = x*u
y = y*u
z = z*u

x = x*5
y = y*5
z = z*5