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In 3ds Max you need to setup a reflection plane. By using the S397 Max Tools you can create a reflection plane with 3 helper points, and automatically puts them in their own layer. Beneath is a video explaining how.
- Select the object you wish to create a plane for. Then press Crete Ref Plane.
- Enable vertex snap on Pivot and Vertexes
- Snap each of the three helper points to the base of the object so that the plane matches the base of your object. It will auto update.
- In the GMT Exporter roll out with the export object selected, enable reflect and use local plane, and then select the created object. It will be named refPlane<NameOfObject>.
- Finally export the object, and add the generated SCN instance to the master SCN file. The refPlane is not saved in the GMT file. (Not in the video).
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Once the reflection plane has been added, you can check that it is reflecting correctly in the Scene Viewer by press ALT+R.