This works:
var a:BitmapData = new BitmapData(640,480);
var b:Bitmap = new Bitmap(a);
a.draw(movieClip);
This doesn't work:
movieClip.mask = movieClipMask;
var a:BitmapData = new BitmapData(640,480);
var b:Bitmap = new Bitmap(a);
a.draw(movieClip);
How can I draw just the visible part of a MovieClip (that uses a mask) into my Bitmap?
Create a new Sprite and add both the MovieClip and its mask to it. Then draw the parent Sprite.
var container:Sprite = new Sprite();
container.addChild (movieClip);
container.addChild (movieClipMask);
movieClip.mask = movieClipMask;
var a:BitmapData = new BitmapData(640,480);
var b:Bitmap = new Bitmap(a);
a.draw(container);
来源:https://stackoverflow.com/questions/9096504/as3-get-bitmap-from-movieclip-with-mask