3D Modeling Workflow: Position Test your 3D model in Unity
You will want to ensure models that you import into UNITY are properly positioned in the 3D world. If you are into Unity game design, consider visiting our gaming site:
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Regardless of which modeling application is used, your model design should be located in the world center at 0,0,0 and probably grounded on the floor. There may be exceptions to this rule which only you can determine for such factors like end-user expectations and interaction with other models.