This scene renders differently depending on whether the parametric is bound
by a sphere or a box. It should render the same in both instances unless
I'm overlooking something.

camera{
  perspective
  location     <1.6,1.6,-3.2>
  look_at      <0,0,0>
}
light_source{
  <5,10,-5>
  color             rgb<1,1,1>
}
parametric{
  function{u*sin(2*pi*v)}
  function{v}
  function{u*cos(2*pi*v)}
  <0,0>
  <1,1>
  contained_by{box{<-1,-1,-1><1,1,1>}}
  //contained_by{sphere{<0,0,0>,1}}
  accuracy          0.001
  max_gradient      1.1
  precompute        20,x,y,z
  pigment{color rgb<1,0,0>}
}

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