vertices = D1:100 D2:100

u = from 0 to (2*PI) D1
v = from (-PI*0.5) to (PI*0.5) D2

a = 10

m = rand2(0.1, 1)

x = a*pow_sign(cos(u)*cos(v), m)
y = a*pow_sign(sin(v), m)
z = a*pow_sign(sin(u)*cos(v), m)
