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position change at in point
How can you set an expression for a parameter like ‘position’ that is active from a layer’s in point? I have dozens of layers that I want to originate from the same position, but at their respective in-points, I’d like to tell them each to move to a new position, so there will be something of a cascading effect as they appear. (Their in points are staggered down the timeline).
Any and all advice is welcome – thanks!
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2 Replies
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The are multiple ways to deal with timing based on in point. Here are a couple:
// move from startPos to endPos over 1 sec
startPos = [100,100];
endPos = [300,300];
moveDuration = 1;
linear(time,inPoint,inPoint+moveDuration,startPos,endPos)// move from startPos at vel pixels per second
startPos = [100,100];
vel = [200,200];
t = time – inPoint;
startPos + t*velUsually, as in the second example, the key is to create a variable (“t” in this case) that equals the time since the in point and use that wherever you would normally use time in your expression.
Dan
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That’s terrific – the second one is just right, since velocity allows me to work with a variable set of clips, rather than defining positions explicitly. How would I randomize the velocity values, however, so that the layers can be made to travel in multiple directions without entering different values in each expression?
Thanks already!
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