Packet corresponds to this client function call:
/**
* This function is called when the server indicates that an entity has entered
* the player's AoI.
*
* It is complicated because it may be called out of order.
*
* @param id entity id.
* @param spaceID id of space where to create the entity in.
* @param vehicleID id of an entity to use as vehicle.
*
*/
void EntityManager::onEntityEnter( EntityID id,
SpaceID spaceID, EntityID vehicleID )
And here how it looks like:
struct EntityLeave {
int32 entityID;
int32 spaceID;
int32 vehicleID;
}