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parenting functionality with expressions
Hi all
I am trying to build more or less complex character rigs with expressions and ran into the following problem.
I got this (see below) code off the fabulous AEenhancers forum, which has some coding masterminds as members.
basicly what it does, is follow a “leader” (body) layer with a delay and a springy motion to create dynamics.so I have this “leader” layer and this “head” layer.
The “head” layer has the below expression so it follows the “leader” and creates a dynamic motion.
But of course the “head” is locked by the expression, so i can not animate it independently.All I need is the same behavior as if I would use parenting: the “head” follows the “leader”‘s motion but can also be animated to the character can move its head.
any ideas in how to change the expression?
cheers
Neil———–
Neil StubbingsP = thisComp.layer("leader").position;delay = 0.8; // link to a slider for easy tweaking
de = delay*thisComp.frameDuration*(index-thisComp.layer("leader").index);F = thisComp.layer("leader").position.valueAtTime(time-de);
xyz = position.valueAtTime(0) - thisComp.layer("leader").position.valueAtTime(0);
n = 0;
if (P.numKeys > 0){
n = P.nearestKey(time).index;
if (P.key(n).time > time){
n--;
}
}
if (n == 0){
t = 0;
}else{
t = time - P.key(n).time;
}if (n > 0){
v = P.velocityAtTime(P.key(n).time - thisComp.frameDuration/10);
amp = 0.05; // link to a slider for easy tweaking
freq = 2; // link to a slider for easy tweaking
decay = 2; // link to a slider for easy tweaking
F + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t) + xyz;
}else{
F + xyz;
} -
3 Replies
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Sometimes it’s just necessary to include the value of the transform property as well.
Try replacing with this line:
xyz = position.valueAtTime(0) – thisComp.layer(“leader”).position.valueAtTime(0) + value;
Trent Armstrong – Creative Cow Leader
https://www.dallasaeug.com -
wow, great thanks! works perfect!
cheers
neil—
Neil Stubbings
Graphic Design | Motion Graphics
https://www.stubbings.ch
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hey
somehow, i do not get this to work anymore… strange
try to do this simple thing:
– create a leader layer
– create a few following layers and apply the expression and said ” + value;” expressionthe layers do not stay on their initial position. they jump to some other position. This of course totally messes up my puppet rig.
any ideas?
cheers
Neil—
Neil Stubbings
Graphic Design | Motion Graphics
https://www.stubbings.ch
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