For a while, this one had me wondering if I'd made a disastrous error in
roundedge.inc.

Code excerpt:
____________________________________________________________________

#include "functions.inc"
#include "roundedge.inc" //From lib.povray.org; defines RE_fn_Blob2()

#macro Basic_shape (Rpipe, Rsaddle)
  1 - sqrt
  ( RE_fn_Blob2 (f_sphere (0, y, z, Rpipe), Rsaddle)
  + RE_fn_Blob2 (f_sphere (x, 0, z, Rpipe), Rsaddle)
  - RE_fn_Blob2 (f_sphere (x, y, z, Rpipe), Rsaddle)
  )
#end

#declare Final_shape = isosurface
{ function { max (Basic_shape (0.5, 0.3), -Basic_shape (0.4, 0.4)) }
  max_gradient 1/0.3
  contained_by { box { -<1, 1, 0>, <1, 1, 0.5> } }
}
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POV-Ray veterans and C programmers will spot my error immediately.

However, the first newbie to post what I did wrong gets a 15% discount off
POV-Ray 3.7.0.  (You do not need to know what RE_fn_Blob2() does to figure it
out.)

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