I agree with Bruce the Precomp would be the solution. I've done this hundreds of times and even as recently as two days ago. It definitely works. :)
In your primary comp create a Solid and apply fractal noise to it. Precomp it making sure "move all attributes" is checked. Now, that Precomp layer position value can be moved all over your frame and the fractal as well as any other layers in the precomp will move together. Using this method you can even take that Mocha track you just did and export as transform data, not corner pin, and you could copy paste that onto your Precomp and it would work too.
Corner pin tracks and corner pin effects Use the entire layer coordinates. So you have to make sure the layer you apply such techniques too are the same frame aspect ratio as the area you are trying to match up. ex: a 16:9 screen using a 4:3 layer, things would stretch out of proportion.
David TornoVisual Effects Artist & Supervisor O: 213.739.2290 C: 818.391.6060 --------------------- http://aeioweyou.blogspot.com
"The most useless day is that in which we do not laugh" -Charles Field ok, so none of that worked. I did a quick track in mocha, which didn't work too well before but with a lot of manual adjustments, it placed it in there nicely and now moves with the "track". I think it had to do with actually having corner pins which uses the entire comp versus masking the solid and the mask traveling around the comp. That was my earlier guess.
So, I guess the bottom line though is you can't really apply to a masked area of a solid when the mask is floating around.
Eric
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