@travis
I think I understand what you say
when I make object box it is stored in limb number 0, and when import object from file it is limb number 1.
There is some rule that limbs must be added consequently: number 1, number 2, number 3... if try to add number 5, it returns error.
If my tank model is made from 1 mesh, does it has limb number 0?
@Greg
I will check that a little later. Am not so skilled in 3d creating to make animated, textured objects yet, so will stick to building objects from pieces inside program. But when game is performing at least 90% of what it should do, I will start to optimize everything, make nice looking models and etc
[EDIT]
Found the "import/export directX model format". It is hidden in File>User preferences>Add-ons
maybe my blender version differs little from yours
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