• Adobe After Effects Expressions

  Expression value to a keyframe

  Posted by Vera Steinbeck on March 7, 2019 at 12:24 pm

  hi there!
  yesterday i searched for a good way to give my first keyframe a value and my second keyframe another value.

  logical (for me) it would be like this:
  s = thisComp.layer("control").effect("example")("example");
key(1).value = 0;
key(2).value = s;

  but i found a solution in this forum where it was told that i have to go via keytime, like this:
  (had to put it to the end of the post)

  the second code works fine, buti think, this is far to complicated to solve my problem.
  does anybody have a better approach to this?
  ????

  max = thisComp.layer("control").effect("example")("example");
min = 0;
t1 = key(1).time;
t2 = key(2).time
if (time<=t1) min;
else if (time>t1 && time<t2) ease(time,t1,t2,min,max);
else max;

  Vera Steinbeck replied 7 years, 2 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Alex Printz

  March 7, 2019 at 4:31 pm

  You cannot push values into keys, only pull. You would do like this:

  
t1 = key(1).time;
t2 = key(2).time;

  v1 = 0;
  v2 = thisComp.layer("control").effect("example")("example");

  linear(time,t1,t2,v1,v2)

  note that you cannot adjust the curves with this; you are only looking at when these keys are set.

  If you want to be able to adjust the slope, set the keys to have different property values (e.g, Key 1: 100, key 2:200), and try this:

  
p1 = key(1).value;
p2 = key(2).value;

  v1 = 0;
  v2 = thisComp.layer("control").effect("example")("example");

  linear(value,p1,p2,v1,v2)

  Note this second expression depends on the keys having different input property values and understanding that your property is going to convert the change in property values into a similar change between your two defined values!

  Alex Printz
  Mograph Designer
• 

  Vera Steinbeck

  March 11, 2019 at 2:28 pm

  thank you alex!

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