• Adobe After Effects Expressions

  Measuring time intervals from an irregular counter – and adding it to an expression.

  Posted by Simon Roberts on April 1, 2014 at 2:12 pm

  Any help greatly appreciated on a problem I’m having.

  I have a slider control which is key-framed to count up a number of times (this itself is irregularly timed). This controls a series of different parameters but the one I’m having most issue with is the anchor point. I want the anchor point to move from one side to the other over the time a loop lasts.

  I’m flummoxed. I’ve posted what I have below.

  What I think I need to do is to automatically measure how long the current loop lasts, add that length of time to all the previous loops and then insert it as a variable to the “ease” expressions.

  // VALUES FROM LOOP
loop = effect("LoopSpeed")("Slider");
loop_no = Math.round(loop-0.5); // number loop
loop_dec = loop - Math.round(loop-0.5); // get decimal out of the loop

  // POSITIONS
  maxY = thisLayer.width;
  minY = 0;

  // TIMINGS
  if (loop_dec < 0.5)
  y = ease(time, 0/25, 20/25, minY, maxY); // first half of loop
  else
  y = ease(time, 20/25, 40/25, maxY, minY); // second half of loop

  // RESULT
x = transform.anchorPoint[0];
[x, y]

  Simon Roberts replied 12 years, 1 month ago 1 Member · 0 Replies
• 0 Replies

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