/** Create a zone from a file (type of file
		* depends on the zone type
		* ZoneType_Default uses an Ogre Model (.mesh) file
		* ZoneType_Octree uses an Ogre Model (.mesh) file
		* ZoneType_Terrain uses a Terrain.CFG file
		*/
	PCZone * PCZSceneManager::createZoneFromFile(const String &zoneTypeName,
												 const String &zoneName,
												 PCZSceneNode * parentNode,
												 const String &filename)
	{
		PCZone * newZone;

        // create a new default zone
		newZone = mZoneFactoryManager->createPCZone(this, zoneTypeName, zoneName);
		// add to the global list of zones
		mZones[newZone->getName()] = newZone;
		if (filename != "none")
		{
			// set the zone geometry
			newZone->setZoneGeometry(filename, parentNode);
		}
		
		return newZone;
	}