Refer to the Unity PMI Viewer Example.

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using System.IO;
using UnityEngine;
{
public override void ImportModel(string thePath)
{
var aModel = ModelImporter.ImportModel(thePath, true);
// convert MDM to GameObject
Unity_ObjectFactory aFactory = new Unity_ObjectFactory();
aFactory.Parameters().SetImportPMI(true);
aFactory.Parameters().SetScaleFactor(ScaleFactor);
string aModelName = Path.GetFileName(thePath);
aResultGameObject = aFactory.Create(aModel, aModelName);
GameObject.Find("Main Camera").GetComponent<CameraControl>().SetTarget(aResultGameObject.transform);
}
}