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Is there a way to create masks using expression?
Posted: July 23rd, 2012, 11:34 am
by chesco
I've been looking all over for the syntax to create masks but I can't find it.
I want to create a transition where your video transitions into another by being masked out slice by slice and the slices are all different widths.
Frank
Re: Is there a way to create masks using expression?
Posted: July 23rd, 2012, 12:32 pm
by chesco
I want to create this effect using expressions.
I made this using keyframes, but it's pretty laborious.
link to vid:
https://dl.dropbox.com/u/43613152/test.mp4
It would be cool if I could let the beat of a song control the reveal, thats what i'd really like.
Re: Is there a way to create masks using expression?
Posted: July 23rd, 2012, 4:12 pm
by Dan Ebberts
Expressions can't create masks or access their control points, but you could create a bunch of masks and apply an expression like this to randomly control each mask's Mask Opacity property:
minDelay = 0;
maxDelay = 5;
seedRandom(index,true);
myDelay = random(minDelay,maxDelay);
time < myDelay ? 0 : 100
Or, you could use a precomp as a track matte, and inside the precomp you could have a bunch of solids of different widths (or with scale expressions to randomly control the widths) and expressions (like the one above) to control opacity.
Dan