I have a complicated object (a union) in an include file, and 
want to remove lots of small pieces from it. So far, so good. 
I also want to have it render quickly, and I want to do all 
this without altering the code in the include file. In outline, 
I'm using:


POV scene file:

#include "HN_frigate.inc"


difference {
   object { HN_frigate }
      
   // lots of small boxes/cylinders/spheres

   box {...}
   cylinder {...}
   .
   .
   .

   bounded_by {...}
  }


HN_frigate.inc:

#declare HN_frigate = union {
	// many objects

	box {...}
	sphere {...}
	.
	.
	.
	}

I don't want to alter HN_frigate.inc every time I wish 
to difference things from the union in that file. I've 
tried making the small objects into a union, and 
subtracting that from object { HN_frigate } but it's 
no faster. What else could I do to speed this all up, 
without altering the include file? Any illumination 
gratefully received...

Tom

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