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Posterize Time with offset
This is a common problem I’ve run into, but never been able to figure out. Often times, I want expression values to change at a rate slower than the composition fps. But I’ll have several layers that I want to change at different times from each other, like flashing christmas light bulbs, or something of that nature. If I use posterizeTime(), I can set the rate of change, but the phase is global for the entire composition, so no matter when a layer begins, all layers will change at the same time.
How would I have two layers that change at the same framerate, but are offset from each other?
Currently, I am randomly picking “source text” values for text layers, so as to display temperatures. I have a bunch of these layers on screen at once, and I want each one to change independantly of each other.
Television Producer
KTVF-11 Fairbanks, Alaska
video.ericbarker.com -
2 Replies
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I’d do my own posterizing, with something like this:
period = 2; // 2 seconds
txt = [“0″,”1″,”2″,”3″,”4”];seedRandom(index,true);
phase = random(period);
seed = Math.floor((time+phase)/period);
seedRandom(seed,true);
idx = Math.floor(random(txt.length));
txt[idx]Dan
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That worked great! I modified it to randomly generate numbers instead of choosing from a list of elements, but basically, that was it.
After a little bit of studying, I understand how it works. This will help me a lot in the future when trying to figure out how to control random number generation, as well as managing time.
Thanks, Dan!
Television Producer
KTVF-11 Fairbanks, Alaska
video.ericbarker.com
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