You do know that oapiEditMeshGroup does not perform the same function as MeshgroupTransform?
Using oapiEditMeshGroup and a custom transformation function to just roatete the vertices of the mesh is indeed the best way to duplicate the functionality of MeshgroupTransform in graphic clients. It's a proven and efficient way, implemented by UCGO, HlynkaCGs add-ons, and IMS. Plus, it also works flawlessly in inline, so you don't need a double implementation (in Inline, you just have to remember that the procedure has to be repeated when the vessels visuals are destroyed and recreated...)
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