• Adobe After Effects Expressions

  Dan’s Elastic Expression, but in 3D

  Posted by Navarro Parker on June 20, 2013 at 10:11 pm

  Hey I found Dan’s cool elastic expression, but I believe it only works in 2D space.

  Is there a way to make this work in 3D space? I want some layers to elastically follow a 3D null.

  restLength = 20;
damp = .95;
leader = thisComp.layer("leader");

  fDur = thisComp.frameDuration;
  currFrame = Math.round(time / fDur);

  p2 = position.valueAtTime(0);
v2 = 0;
for (f = 0; f <= currFrame; f++){
t = f*fDur;
p1 = leader.transform.position.valueAtTime(t);
delta = p2 - p1;
nDelta = normalize(delta);
a = 2 * nDelta * (length(delta) - restLength) * fDur;
v2 = (v2 - a) * damp;
p2 += v2;
}
p2

  Darby Edelen replied 13 years, 2 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Darby Edelen

  June 21, 2013 at 5:25 pm

  I don’t see any reason why that expression wouldn’t work in 3D. Are you having some problem with it?

  Darby Edelen

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