I see the material you're talking about --- at the bottom of the vehicle and the turret, correct? I'm not sure why the AC3D loader isn't recognizing these assignments. I loaded the OBJ model into trueSpace, and all materials show up fine.
So this seems to be a problem with the OBJ loader, not the exporter.
Let me know if you find anything that may be related to the exporter, and I'll be glad to have a look at it.
Oh, and send a private message to Andy to get the ac_plugin.h header - it's part of the AC3D SDK.
Dennis
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