成员的完整列表，这些成员属于 _vrpn_DisplayableObject,包括所有继承而来的类成员

m_ObjectType (定义于 _vrpn_DisplayableObject)	_vrpn_DisplayableObject
m_pObject (定义于 _vrpn_DisplayableObject)	_vrpn_DisplayableObject
m_pObjectMesh (定义于 _vrpn_DisplayableObject)	_vrpn_DisplayableObject