[Romain Charles]

Thank you Andreas,

I applied your expression on scale (using “(n > 0 && t < time_max)” instead of “(n > 0 && t < time_max)”), And the result is not what I am expecting : the scale is modified according to the velocity or speed position. But there’s no bouncing effect after.
I had already tried to do the same thing, using “transform.position” instead of “propertyPosition.value” (is there a difference?) but didn’t work either.
That’s why I used the second method.

[Romain Charles]

Update

memberA=thisComp.layer("épaule droite");
memberB=thisComp.layer("patte avant droite");
memberC=thisComp.layer("mollet avant droite");

function getWorldPos(L){
return L.toWorld(L.anchorPoint);
}

distA = length(getWorldPos(memberA),getWorldPos(memberB));
distB = length(getWorldPos(memberB),getWorldPos(memberC));
radius = distA+distB;

center = getWorldPos(memberA);
pos = getWorldPos(thisLayer);

v = pos - center;
length(v) > radius ? center + normalize(v)*radius : value

[Romain Charles]

Hello, this is how I used your expression to work better on duik rigging.
I lock the controller on the members.
The expression is applied to the controller position.
Thanks to the both of you !

// layers relationships : member C parented to memberB parented to memberA parented to control

memberA=thisComp.layer("cuisse droite");
memberB=thisComp.layer("patte arrière droite");
memberC=thisComp.layer("mollet arrière droite");
control=thisComp.layer("corps");

function getWorldPos(L){
return L.toWorld(L.anchorPoint);
}

distA = length(getWorldPos(memberA),getWorldPos(memberB));
distB = length(getWorldPos(memberB),getWorldPos(memberC));
radius = distA+distB;

// if the anchorPoint of the control layer is no [0,0]
center = memberA.transform.position
-corps.transform.anchorPoint;

position = transform.position;
v = position - center;
length(v) > radius ? center + normalize(v)*radius : value

[Romain Charles]

Thank you too Dan, that gives me the occasion to work my javascript 😉

[Romain Charles]

Thank you very much, I spent my entire day trying to find a solution !
You’re the best !

[Romain Charles]

Thanks a lot Brian, I’m going to look at that.
Thank you

[Romain Charles]

The newbie thanks you.

[Romain Charles]

Actually I have this problem for each real-time operation : using camera with tools, moving the timeline’ cursor… I have to stop the handling to see the result.