Usually the best bet for modular building pieces is to use the modularity to put together your bldgs in your DCC app (Max, Maya, etc.) but then attach all the pieces of one bldg into a single entity. Then, create your lightmap UVs. That's generally the best way, though I would look closely at how Epic does it if you're…
This is really interesting. I'm having a bit of an internal crisis with myself over a modular building I'm creating: I have modular building pieces (walls, windows, shot fronts, canopy's) all sharing one giant 2048 texture. The modular pieces are not one model - each one is a mesh in UDK that I can move it around. however…