Howdy
You will add some new chunks to 3ds? That mean those new 3ds'es will be 
understandable with lib3ds only?
I'm all right with this decision :-) as far as I know all 3ds 
import/export(for example blender) is done through lib3ds so there 
should be no problem with upgradeing.
If so i like to add my 2 cents: consider adding of indices with mapping 
coordinates separated from points indices, like this:

struct Face
{
int points[3];
int uvs[3];
...
};
This will allow correct calculation of lighting with smoothing groups.

Greets
Rafał


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