Tractrix Based Minimal Surface
By Roger Bagula
Graphics by
Paul Bourke
January 2003
x = cos(u) (v - tanh(v))
y = cos(u) / cosh(v)
z = x
^{2}
- y
^{2}
+ 2 x y tanh
^{2}
(u)
-pi <= u <= pi, -pi <= v <= pi