resolution:
1.put all models into one gmax file.(main object and sub object)
2.move everything to make the FIREPOINT01 being the origin (pos [0,0,0]). for example, the pos of the FIREPOINT01 is [1,2,3]. then all objects are relatively move [-1,-2,-3].
3.hide all of the main object, and export the sub ojbect as usual.
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