#http://www.mathcurve.com/surfaces/coneelliptique/coneelliptique.shtml
vertices = D1:100 D2:100
v = from 0 to (2*PI) D1
u = from (-1) to (1) D2
a = rand2(1, 10)
b = rand2(1, 10)
h = rand2(0.5, 10)
x = a*u*cos(v)
z = b*u*sin(v)
y = h*u
