I think the camera should be scaled non-uniformly if the union it's inside
is scaled non-uniformly. It's the only reliant and fully predictable method.
(It is however likely to produce non-perpendicular vectors, which will
produce an error in many cases).

Anyway, the smart user should not need to worry.

Instead of writing:

union {
   object {...}
   object {...}
   camera {...}
   scale Non_Uniformly
}

He would write:

union {
   union {
      object {...}
      object {...}
      scale Non_Uniformly
   }
   camera {...}
}

I can't think of any cases where this wouldn't be a possible solution.

Rune
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