• Adobe After Effects Expressions

  Label follow ball bounce *but* remain at the maximum historical position?

  Posted by Simon Roberts on February 14, 2014 at 1:21 pm

  I’ve tried and I’m stuck …any help greatly appreciated 🙂

  MORE DETAIL: I want have a label follow a ball bounce and have it remain at the maximum historical height of the ball (which will gradually increase).

  I can make the label follow the ball (easy!) but I can’t make it remain in position once it’s reached it’s maximum height to date. Can anyone show me how to do this?

  This obviously isn’t it but this all I have that works so far:

  this_y = transform.position[1];
ball_y = thisComp.layer("Ball").transform.yPosition;

  if (ball_y < this_y) {
  new_y = ball_y;
  } else {
  new_y = this_y;
  }

  [transform.position[0], new_y]

  Simon Roberts replied 12 years, 3 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  February 14, 2014 at 5:58 pm

  Something like this maybe:

  
ballY = thisComp.layer("Ball").transform.yPosition;
minY = value[1];
f = timeToFrames(inPoint);
fStop = timeToFrames(time);

  while(f <= fStop){
minY = Math.min(minY,ballY.valueAtTime(framesToTime(f)));
f++;
}
[value[0],minY]


  Dan
• 

  Simon Roberts

  February 14, 2014 at 6:05 pm

  Thanks Dan! Works perfectly.

  Also I’ve read lots of your posts before and some of your online guides too – thanks for being so generous with your time and knowledge.

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