Matt Giwer <jul### [at] ijnet> wrote:
>
> Literally a patch? No, attached is what it objects to being added.

Well, not quite literally a patch.  What you do have is light sources inside
the union, which is valid.  But how can POV-Ray determine the result of
differencing a light source from an object (OK - I guess one possibility
would be to use the negative of the light's colour...).  In this case,
however, POV-Ray light sources are defined with patch objects as those
elements which may not be used negatively in CSG, hence the error you are
getting.

The solution is to remove the light sources from the ship2 object, if you
want to be able to difference ship2 from other objects.  If you want the
light sources to be where they would be in the differenced result, simply
declare and use them separately:

   #declare ship2 = union {...}
   #declare ship2lights = union {light_source ... }

   union {
      difference {
         object {object1}
         object {ship2 translate x*4}
         superellipsoid {...}
         }
      object {ship2lights translate x*4}
      }

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