Posts Tagged mask
My friend Justin recently asked me if I knew how to invert a mask in AS3. Technically of course this is not possible (at least as far as I know). You can however nest the DisplayObject you wish to mask and a copy of the original mask in a Sprite or MovieClip and use the LAYER and ERASE blend modes to create the desired effect.
You can get the source code for this HERE. I hope this helps.