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Keyframe Controller
Hello All
i’ve been reading this forum for quite a while now and it’s been REALLY helplful with making sense of the whole expressio issue.
maybe you guys can help me with a problem.
i want one layers’ Oapcity keyframes to control other layers’ opacity keyframes.
really easy huh ??? well, i know i can pickwhip the properties together. BUT !!!
i need the other layers to offset in time.
basicly, if my control layer has on and off KF’s at the begining time code. i’d like the other offset layers to have the exact KF’s – each corresponding to it’s in or out point. -
3 Replies
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Every proprety has the method called valueAtTime().
As the name suggests, this retrieves not the current value of a property, but at a specific time.Your problem would be figuring out at what time you want to sample the opacity values, here’s the solution:
controller=thisComp.layer("controller");
t=time-controller.inPoint-inPoint;
controller.opacity.valueAtTime(t);
if the controller-layer starts at frame 0, the 2nd line could read “t=time-inPoint”, but this is more universal.
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Unless I’m missing something, it seems like you have to flip the sign of the controller’s in point:
controller=thisComp.layer(“controller”);
t=time+controller.inPoint-inPoint;
controller.opacity.valueAtTime(t);Dan
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THANK YOU SO SO MUCH.
you guys really saved me from individually keyframing about 200 or so layers, each with it’s own in Point.
Expressions ROCK !!!!
Next stop – SCRIPTING !!!!Thanks again.
Ariel
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