Figure 8 Torus
Written by
Paul Bourke
December 2000
x = cos(u) (c + sin(v) cos(u) - sin(2 v) sin(u) / 2)
y = sin(u) (c + sin(v) cos(u) - sin(2 v) sin(u) / 2)
z = sin(u) sin(v) + cos(u) sin(2 v) / 2
-pi <= u,v <= pi
c = 1
c = 1.5
c = 0.5
