#http://www.mathcurve.com/courbes2d/biquartic/biquartic.shtml

vertices = D1:4000 D2:6

m = 8

u = from (-PI) to (m*PI) D1
v = from 0 to 1 D2

n = rand_int2(3, 10)
p = (1 + cos(n*u) + sin(n*u)^2) * v
k = u/m/2

x = p*cos(u)*cos(k)
z = p*sin(u)*cos(k)
y = abs(p)*sin(k)
