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Layer width as it moves on Z axis
I’ve made this example to simplify the original situation; The red circle has the following expression in its position:
a = thisComp.layer(“CIRCLE-BLUE”);
b = a.toWorld(a.transform.anchorPoint);
c = thisComp.layer(“CIRCLE-BLUE”).content(“Ellipse 1”).content(“Ellipse Path 1”).size;
[ (b[0]+c[0]/2) , b[1] ]
It is using the blue circle size to be parented to the right corner of the blue circle.
But the blue circle is a 3D layer, and when I move it on the Z axis, the red circle can’t calculate its new position based on the blue circle’s size referent to the comp.Is there a way to define blue circle’s width in real time as it moves on the Z axis?
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3 Replies
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I think it would be more like this (assuming your anchor point is centered):
a = thisComp.layer("CIRCLE-BLUE");
b = a.content("Ellipse 1").content("Ellipse Path 1").size;
c = a.toComp(a.anchorPoint + [b[0]/2,0]); -
I knew you would be the one to solve this! I had to adapt it a bit to fit my original plan, which was to have a line snap to the corner of an ellipse as if it was touching it. I’ll upload the results, this is the finished line of expression:
// LAYERS
posP = thisComp.layer(“LINHA: Path 1 [1.1.2]”).transform.position;
bola = thisComp.layer(“BOLA-AZUL”);
diametro = thisComp.layer(“BOLA-AZUL”).content(“Ellipse 1”).content(“Ellipse Path 1”).size;
posB = bola.toComp(bola.anchorPoint);
pontaB = bola.toComp(bola.anchorPoint + [diametro[0]/2,0]);
posB3D = [posB[0],posB[1]];
// SPECULATIVE
raio = sub(pontaB,posB)[0];
c = sub(posB, posP);
modc = length(posP,posB3D);
alfa = -Math.acos(c[0]/modc);
theta = Math.asin(raio/modc);
beta = alfa-theta;
modv = Math.sqrt(Math.pow(modc,2)+Math.pow(raio,2));
v = [Math.cos(beta)*modv, Math.sin(beta)*modv];
add(posP, v)
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Thank you for solving this, Dan!
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