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Starting a cumulative expression based on a condition
Hey guys,
I’m trying to get a cumulative expression to start when the position of another layer crosses its Y-Position value. In this case, start pushing layer2’s X-Position once layer1’s Y-Position passes it.Here’s what I have:
track = thisComp.layer(“layer1”).transform.position;
pos = transform.position;
accum = 0;for(i=timeToFrames(inPoint);i<=timeToFrames(time);i++){
if (track.valueAtTime(i)[1]<=pos[1]){
accum += 0;
}else{
accum += 10;
}
}value + [accum,0];
I can’t for the life of me figure out why this code doesn’t work. It seems to ignore the IF statement and accumulate from the very start.
It isn’t for anything in particular, I’m just trying to get it to work as a concept.
Any help would be greatly appreciated.
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4 Replies
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Expressions do not retain values. You can pass on the value to an invisible textbox and recall the value with a textString argument. I suggest that you post your Q at the COW’s AE Expressions Forum.
HTH
RoRKIntensive mocha & AE Training in Singapore and Other Dangerous Locations
Imagineer Systems (mocha) Certified Instructor
& Adobe After Effects ACE/ACI (version 7) -
Try changing this line:
if (track.valueAtTime(i)[1]<=pos[1]){
to a couple of lines:
t = framesToTime(i);
if (track.valueAtTime(t)[1]<=pos[1]){New/changed code is in bold.
Darby Edelen
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Thanks heaps Darby. I completely overlooked the fact that I was passing a frame value instead of time.
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Good stuff Darby!
Cheers
RoRKIntensive mocha & AE Training in Singapore and Other Dangerous Locations
Imagineer Systems (mocha) Certified Instructor
& Adobe After Effects ACE/ACI (version 7)
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