I might be misinterpreting its use, but multi/sub-objects allow you to export multiple materials as one material? You still have to import the textures in UDK, but this groups everything in one file of sorts? I'm not understanding how you apply a multi/sub-object material to an object you've already unwrapped and textured? For instance, I just watched a tutorial where an Ak-47 was modeled, the wood parts of the model were given ID 1, and the metal parts to ID 2. I understand how to apply the IDs, but can't figure out the process behind unwrapping and texturing in the 0-1 UV space vs applying material IDs. It seems like a waste of memory to apply individual textures to an object you have to unwrap anyways, but I know I'm missing some vital piece of information to lift this cloud of confusion.
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Multi/Sub-Object vs texturing an unwrap