Re: sketchup to .obj
The Obj format was originally designed for single objects but there are ways to break up parts by using the "o" lines in the obj file - which AC3D should use to split the model into objects. I'm not sure if Sketchup supports this. Some software has settings which may add this functionality - might be worth checking.
You might try Collada (.dae) as an export from Sketchup as an alternative to obj.
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