#http://www.mathcurve.com/courbes3d/spiraleconic/pappus.shtml

vertices = 12000

t = from (-8*PI) to (8*PI)

r = 10
a = rand2(PI*0.1, PI*0.9)

x = r*t*sin(a)*cos(t)
y = r*t*cos(a)
z = r*t*sin(a)*sin(t)
