Helicoid transformation
GGB Script
# For animation
t = Slider(-pi, pi, 0.01, 1, 200, false, true, false, false)
# Surface
h = Surface(cos(t) sinh(v) sin(u) + sin(t) cosh(v) cos(u), -cos(t) sinh(v) cos(u) + sin(t) cosh(v) sin(u), u cos(t) + v sin(t), u, -pi, pi, v, -1.5, 1.5)