Sometimes there is no max gradient warning, even when the max_gradient is
clearly too low.  I cannot figure out the circumstances under which it decides
to skip the max gradient warning.  When I tried to create a simplified scene,
the warning showed up again.

This is the simplified scene where the warning did show up:
  _________________________________________________________

  #version 3.7;
  global_settings { assumed_gamma 1 }
  light_source { <-3.3125, 7.6250, -5.7374>, rgb 1 }
  camera
  { location <0.0000, 1.0000, -5.6713>
    look_at <-0.7969, 1.2000, -0.0598>
    angle 10.7447
  }
  #include "functions.inc"

  isosurface
  { function { f_sphere (x, 0, z, (2660 - 40*y) / 9) }
    contained_by { box { <-80, 31, -24>, <-128, 56, 24> } }
    pigment { rgb <1, 0.75, 0> }
    scale 1/128
    rotate -35 * x
    translate y
  }
  _________________________________________________________

I have been unsuccessful at creating a simplified scene that reproduces the
problem.  But when I run the full scene, there's no warning.

POV-Ray version: 3.7.RC6
Operating system: openSUSE Linux 12.1

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