Away3D 实现场景中的倒计时

需求：需要在死亡人物处实现一个3D的倒计时

问题：如果用两个以上的Sprite3D实现，因为是billboard，总会有一个视角是重叠的

解决：将要显示的图片资源先合并，然后再替换Sprite3D的material

代码

	var num0:int = value / 10;
	var num1:int = value % 10;
	_bitMapData ||= new BitmapData(64, 32, true, 0x00FFFFFF);
	_emptyBmp ||= new BitmapData(19, 26, true, 0x00FFFFFF);
	_rect ||= new Rectangle(0, 0, 19, 26);
	_point ||= new Point();
    if(_lastNum0 != num0){
        _lastNum0 = num0;  
        bmp = asset.getBitmapDataByName(num0 + ".png"); 
        _point.x = 0; 
        _bitMapData.copyPixels(_emptyBmp, _rect, _point);//先清空     
           _bitMapData.copyPixels(bmp, _rect, _point);    }  
    if(_lastNum1 != num1){      
       _lastNum1 = num1;        
       bmp = asset.getBitmapDataByName(num1 + ".png");        
       _point.x = 25;        
       _bitMapData.copyPixels(_emptyBmp, _rect, _point);        
       _bitMapData.copyPixels(bmp, _rect, _point);   
    }
    (sp.material as TextureMaterial).texture.dispose();
    (sp.material as TextureMaterial).texture = Cast.bitmapTexture(bitMapData);

如果想添加文字

则用 bitmapData.draw(new TextField);

可以用来实现怪物跟随的名字等信息