Is it possible to have an expression linking keyframes to a time remapped layer?

[Dan Ebberts]

A time remapping expression like this should work:

threshold = 5.0;

rotVal = thisComp.layer(“Rotation Layer”).transform.rotation;

above = false;
frame = Math.round(time / thisComp.frameDuration);
while (true){
t = frame * thisComp.frameDuration;
if (above){
if (rotVal.valueAtTime(t) < threshold){ frame++; break; } }else if (rotVal.valueAtTime(t) >= threshold){
above = true;
}
if (frame == 0){
break;
}
frame–
}
if (! above){
t = 0;
}else{
t = time – frame * thisComp.frameDuration;
}

Dan

[Daniel Haskett]

hey dan

thanks for your help, i just tried that now and it works well. however it only plays the time remapped layer once. is it possible so that whenever the layer rotates past 5 degrees it will play the time remapped layer again?

thanks again

dan

[Daniel Haskett]

OOOPS! sorry please ignore that last post, i had the expression turned off so it was only playing once. just turned it on and it works great, thanks dan!

dan

[Daniel Haskett]

actually sorry dan, just one more thing…./

is there a way so that when the rotation goes below 5 degrees, it will make the time remapped layer go back to its first frame?

thanks again!

dan

[Dan Ebberts]

This should do it:

threshold = 5.0;

rotVal = thisComp.layer(“Rotation Layer”).transform.rotation;

if (rotVal < threshold){ 0 }else { above = false; frame = Math.round(time / thisComp.frameDuration); while (true){ t = frame * thisComp.frameDuration; if (above){ if (rotVal.valueAtTime(t) < threshold){ frame++; break; } }else if (rotVal.valueAtTime(t) >= threshold){
above = true;
}
if (frame == 0){
break;
}
frame–
}
if (! above){
0;
}else{
time – frame * thisComp.frameDuration;
}
}

Dan

[Daniel Haskett]

Thanks Dan, you’re a legend!

[Brad Pickford]

Hi Dan, I am trying to use this expression but I am getting the following error message…

After Effects warning: Expected: )
Expression disabled.

Error occurred at line 6.
Comp: ‘51_dad_isp_truck 02’
Layer: 9 (‘spray’)
Property: ‘Time Remap’

Can you help?

Thanks, Brad

[Dan Ebberts]

Please post the expression that’s generating the error.

Dan

[Brad Pickford]

Here is the expression which is on the the Time Remap property…

threshold = 5.0;

rotVal = thisComp.layer("51_divider_horiz").transform.rotation;

if (rotVal
0
}else {
above = false;
frame = Math.round(time / thisComp.frameDuration);
while (true){
t = frame * thisComp.frameDuration;
if (above){
if (rotVal.valueAtTime(t)
frame++;
break;
}
}else if (rotVal.valueAtTime(t) >= threshold){
above = true;
}
if (frame == 0){
break;
}
frame--
}
if (! above){
0;
}else{
time - frame * thisComp.frameDuration;
}
}


[Dan Ebberts]

It looks like you’ve only got part of the 5th line. Sometimes lines that contain a less-than character get mangled.

Dan