void startAnimation() { _nextDeltaTimeZero = true; if (_isAnimating) { return; } // approximate frame rate // assumes device refreshes at 60 fps int frameInterval = Mathf.FloorToInt(_animationInterval * 60.0f); CCDebug.Log("cocos2d: animation started with frame interval: {0:0.00}", 60.0f / frameInterval); _displayLink.registWithTarget(this, mainLoop, OnGUI); _isAnimating = true; }