I have read the Roaming-Ralph example, and find “start_point” group in world.egg file. But, I can not find anything about “start_point” in 3dmax when I import egg into 3dmax. How do I mark start_point in model? 
Add an empty to where you want him to start, and name it start_point. After you load a model, check the scene graph for ‘*/start_point’ and place your character there.
It is good idea!
Thank you very much