Additional images: Anaglyph, Anaglyph Wireframe, Parallel Stereo
LiveGraphics3D, JavaView
     Hellicoid-Catenoid Associated Family of Minimal Surfaces

  Px = bb*(cos(aa)*sinh(v)* sin(u) + sin(aa) * cosh(v) * cos(u))
  Py = bb*(-cos(aa)*sinh(v) * cos(u) + sin(aa) * cosh(v) * sin(u))
  Pz = bb * (cos(aa) * u + sin(aa) * v)

Helicoid and catenoid are one-parameter family of surfaces. This movie shows one morphing into the other.

Supporting files: Description in PDF