#http://www.mathcurve.com/surfaces/klein/toredeklein.shtml

vertices = D1:100 D2:100
u = from 0 to (PI*2) D1
v = from 0 to (PI*2) D2

a = rand2(1, 10)
b = rand2(1, 10)

k = rand_int2(1, 20)
k = k / 2

x = (a+b*cos(v))*cos(u)
z = (a+b*cos(v))*sin(u)
y = b*sin(v)*cos(k*u)
