• Adobe After Effects Expressions

  time remapping’s offsetted speed + slider

  Posted by Peter Zeet on September 17, 2014 at 11:11 pm

  Hi all!
  I don’t know if this is possible..
  I have a composition with time remapping applied on it (2 keyframes, first set at zero and next makes the animation quickier than the original).
  I’d need a slider to control the speed of that time remapping, but making that new speed I did (with these 2 keyframes ) be the base speed, and not the original
  (so, let’s say now is a 123% quickier than the original.. I want to make the slider think that speed is the original, and then change the speed according to that while moving the slider)

  I tried this Dan’s solution from this thread https://forums.creativecow.net/readpost/227/26731, but it makes the slider control the original speed of the comp, and overrides my manually keyframed re-speed…

  spd = effect("Slider Control")("Slider");
n = spd.numKeys;
if (n > 0 && spd.key(1).time < time){
accum = spd.key(1).value*(spd.key(1).time - inPoint);
for (i = 2; i <= n; i++){
if (spd.key(i).time > time) break;
k1 = spd.key(i-1);
k2 = spd.key(i);
v2 = spd.valueAtTime(k2.time-.001);
accum += (k1.value + v2)*(k2.time - k1.time)/2;
}
accum += (spd.value + spd.key(i-1).value)*(time - spd.key(i-1).time)/2;
}else{
accum = spd.value*(time - inPoint);
}
accum/100

  thanks a lot!

  Peter Zeet replied 11 years, 10 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  September 17, 2014 at 11:44 pm

  If you keyframed time remapping is still linear and starts a zero, I would think you could replace the last line with this (not tested):

  
if (numKeys > 1)
factor = (key(2).value-key(1).value)/(key(2).time-key(1).time)
else
factor = 1;
accum*factor/100


  Dan
• 

  Peter Zeet

  September 17, 2014 at 11:51 pm

  I think it works! Thanks!!

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