> Does anyone know of a good approach to remove and merge coincident or 
> hidden surfaces from meshes? I am interested in creating a tool that 
> "cleans up" LDraw models so that the models are usable in real-time 
> applications. Currently, the models use so many polygons (most of which 
> are hidden or duplicated) that real-time applications aren't ideal. I'd 
> like to create a simple tool that "converts" models so they're usable in 
> such things as games.

You might want to look at Meshlab. 
I think that might do what you want already.
If not, it's open source GPL so it would give
you a starting point to improve on.
http://meshlab.sourceforge.net/

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