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no. you just need to enable the cacheAsBitmap properties of the mask and masked movieclips if you want to use alpha transparency in the mask.
how do I access the cacheAsBitmap properties of a mask, besides typing
"myMovieClip.cacheAsBitmap = true;" in the actionscript - (which incidentally didn't have any effect on my attempt to get the following to work.)
but it didn't work. When I hit the spacebar, nothing happens. although something peculiar happens when I try this instead:
it acts like a mapping function, making visible/revealing all areas where the mask moves across, without going back to concealed/black when the mask area is moved. While it isn't what I'm attempting to do, I thought it might be useful to know for debugging purposes. My mask movie clip is on a mask layer, separate from the things it is attempting to mask, one layer up.
i never said it would work. i was just answering your question and giving you information that might be helpful.
to debug your error, start by checking if you're changing any of the mask's properties by disabling the masking and inspect your mask on-stage while testing.