The only sense in using a 3d engine for this purpose is to simulate behaviour in 3D and adapt it to real robots (like puppets) or as visualization tool for realtime action or as viewer for logged robot session to analyze misbehaviour or something like else.

If you do this, keep in mind that you have to built 3D models and animation skeletons similar to your robot and that you have to deal with euler angles and so on (gimbal lock!) when translating rotation matrices to gamestudio entities.

Best regards,
-Christian