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Pause & continue to an expression
Hi,
My question already might have been sorted out somewhere but I couldn’t find a proper answer for 2 hours. So please help:)
I need to pause&continue an expression by using a checkbox. I have loopOut(“offset”) on the rotation property with just 2 keyframes. So the rotation value is 0 in the first frame, 3 at fr150, 3.80 at fr190, and so on. On a given time by keyframing the checkbox, say at 250th frame, I’d like the expression to read and keep that value, which is 5, until the next checkbox keyframe. And from the next keyframe, I want it to start again adding the value on top of 5, the value of the previous checkbox keyframe at the 250th frame.
Any ideas, please?
Thank you -
4 Replies
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Hi Oguz,
It was a pretty tough one, too bad that loopOut() doesn’t take a third parametr for time, so I had to rewrite code to mimic what loopOut(“offset”) does.
This is the final expression for rotation:
ch=effect("Freeze")("Checkbox"); // point to your checkbox
n = ch.numKeys;// start-stop time variable adapted from Dan's Speed control integrator
if (n<2) {
t=time * !ch.value;
} else {
t=ch.key(2).time * !ch.key(1).value;
for(i=2; i time) break;
t+=(ch.key(i+1).time - ch.key(i).time) * !ch.key(i).value;
}
t+=!ch.value*(time-ch.key(i).time);
}// fake loopOut(offset):
if (numKeys>1 && t>key(numKeys).time) {
k1 = key(1).time;
knk = key(numKeys).time;
delta = key(numKeys).value - key(1).value;// have to do stupid conversion to framenumbers because of % vs / rounding errors }:-(
loopTime = timeToFrames(k1) + (timeToFrames(t-k1) % timeToFrames(knk-k1));
loops = Math.floor(timeToFrames(t-k1) / timeToFrames(knk-k1));
// now convert back
l = valueAtTime(framesToTime(loopTime)) + (loops*delta);
} else {
l = valueAtTime(t);
}
Right now the code works that when the checkbox is ON -> time stops. That’s why I named it freeze.
To invert the behavior (time freezes when it’s OFF) change every !ch.value into ch.value -
Hey Filip, frankly I wasn’t expecting to cause that much pain, so thank you very much!
But looks like there might be a syntax issue (unexpected identifier) here:Thank you
} else {
t=ch.key(2).time * !ch.key(1).value;
for(i = 2; i time) break;
t+=(ch.key(i+1).time - ch.key(i).time) * !ch.key(i).value;
} -
Yes, sorry, problems with < and > characters.
ch=effect("Freeze")("Checkbox"); // point to your checkbox
n = ch.numKeys;// start-stop time variable adapted from Dan's Speed control integrator
if (n < 2) {
t=time * !ch.value;
} else {
t=ch.key(2).time * !ch.key(1).value;
for(i=2; i < n ; i++) {
if (ch.key(i).time > time) break;
t+=(ch.key(i+1).time - ch.key(i).time) * !ch.key(i).value;
}
t+=!ch.value*(time-ch.key(i).time);
}// fake loopOut(offset):
if (numKeys>1 && t>key(numKeys).time) {
k1 = key(1).time;
knk = key(numKeys).time;
delta = key(numKeys).value - key(1).value;// have to do stupid conversion to framenumbers because of % vs / rounding errors }:-(
loopTime = timeToFrames(k1) + (timeToFrames(t-k1) % timeToFrames(knk-k1));
loops = Math.floor(timeToFrames(t-k1) / timeToFrames(knk-k1));
// now convert back
l = valueAtTime(framesToTime(loopTime)) + (loops*delta);
} else {
l = valueAtTime(t);
}
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Wow, it worked like magic:)
Thank you so much Filip!Cheers
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