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Make an Eraser, mask, or stroke follow another layer
I want a layer to be the source point of an eraser, mask or stroke to mask out whatever is behind it. For example, pretend its a pacman game. As pacman moves, the dots behind him will dissappear. Obviously you can mask this by hand, but its a bit of a pain. Any ideas. I realize you can also use a stroke just to cover the dots with black, so any ideas on that would be great.
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8 Replies
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Dots = Vegas effect. (built-in to AE)
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Thanks steve, but I have the dots created already. My question is how to write them off just by following the position of the pacman character without having to make a mask or stroke and keyframe properties.
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Use animated Vegas as a track matte?
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… or maybe you could use write-on to follow the Pac-Man? Using an expression to tie the write-on brush to the Pac-Man’s position?
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Steve, that still involves hand animating it doesn’t it? I want something that uses some kind of expression to follow the position of the pacman layer.
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Nope. Read my post again. 🙂
In more detail: add a solid, apply effect>generate>write-on, alt-click on the effect’s brush position, and pickwhip it to Pac-Man’s position. Adjust brush width and spacing to taste, and use this layer as a track matte.
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… and if you adjust the spacing to make dots, you should make Pac-Man’s speed constant using roving keyframes to keep the write-on spacing constant.
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Steve,
Great tip on the write on, thanks for that. I had the roving key frames going already, and its looking good. Thanks again.
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