> I have plans to instantiate and copy all three knots several times in a
> single scene. Does anyone know if the tiny memory overhead of mesh cloning
> extends to meshes grouped in a union? (i.e., if each knot is a union of
> meshes, will copies of that union gobble up my RAM?)

AFAIK, you will end up with references to all meshes, not to the union. 
Altough those references should take little space that could be a lot, 
assuming you're 79,500 meshes. Can't you merge some of those meshes (Not 
the POV 'merge', of course)? Meshes don't need to be contigous, you know.


HTH,
Florian

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