#http://www.mathcurve.com/surfaces/conesinusoidal/conesinusoidal.shtml
vertices = D1:100 D2:100
v = from 0 to (PI*2) D1
u = from 0 to (1) D2
r = rand2(1, 20)
k = rand2(0.5, r*0.5)
n = rand_int2(1, 10)
x = r*u*cos(v)
z = r*u*sin(v)
y = k*u*cos(n*v)
