public BodyCreator(){
		textures = new HashMap<String, WeakReference<GPUTexture>>();
		strongTextureReferences = new HashMap<String, GPUTexture>();
		serialNumberMap = new WeakHashMap<Body, Integer>();
		latestSerialNumber = 0;

		// ɎgeNX`̃[h
		try{
			addTexture("res/johnny.png");
			addTexture("res/johnny_ahe.png");
			addTexture("res/johnny_pangmi.png");
		}
		catch (Exception e){
			throw new Error("texture load error.");
		}
	}