Am 02.04.2013 08:45, schrieb Ger:
>
> If you look at the code then you'll see that in both cases the object in
> view is something like
>
> difference {
>    union {
>      box {}
>      cone {}
>      torus{}
>      }
>    50 x frame_number // for each iteration the same
>    sphere{}
>    }
>

Nope; the code the Erode macro generates is

difference {
   difference {
     difference {
       object { ObjectToErode }
       sphere {}
     }
     sphere {}
   }
   sphere {}
}

whereas the code the Erode1 macro generates is

difference {
   object { ObjectToErode }
   sphere {}
   sphere {}
   sphere {}
}

Note that POV-Ray doesn't collapse nested differences into a single one 
(although it would probably be a good idea).

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