Can anyone help me figure out what's wrong with this sweep?  It seems to
work fine with a linear_sphere_sweep, but catmull_rom and b_spline
sweeps give me an error "Attempt to maloc zero size block..."  Maloc?
Any hints?

sphere_sweep {
  b_spline_sphere_sweep
  3,
  <0, .5, 0>, .5
  <.75, 0, 0>, .25
  <0, -1, 0>, .01
  texture { pigment { color Black } }
  finish { phong .4 }
}

The idea is to have two of these for a yin-yang symbol...

See ya...
Mike

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