• Adobe After Effects Expressions

  linear,wiggle, and opacity oh my

  Posted by Josh Holdens on May 18, 2014 at 11:20 pm

  I’m getting a bit stomped as I continue to grow with expressions. I think that I’m missing a few pieces of the puzzle here. I have come up with a couple expressions(derived from) and am troubleshooting them.

  My attempt with expression 1, is to have object A start moving when time is greater than two seconds. Instead it just pops into place.

  In expression two, I have stumbled across the conditional expression for opacity and am just wanting to know why the expression I’m attempting to use fails when applied to opacity(derived from a similar expression applied to scale).

  Thanks for any insight into these topics

  ///expression 1\\\

  Assigned to Position:

  if (time > 2){
  linear(time,value,[960,100])
  }else{
  value
  }

  expression 2

  fadeIn = linear(time,inPoint+.5,inPoint,0,100);
  fadeOut = linear(time,outPoint,outPoint - .5,100,0);

  fadeIn+fadeOut

  Josh Holdens replied 11 years, 12 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  May 19, 2014 at 1:50 am

  For the first one, you need to define either a speed, or a duration. The speed version would be something like this

  if (time > 2)
  value + [50,50]*(time-2)
  else
  value

  Your fade in/fade out would be more like this

  if (time < (inPoint+outPoint)/2)
  linear(time,inPoint,inPoint+.5,0,100)
  else
  linear(time,outPoint – .5,outPoint,100,0);

  Dan
• 

  Josh Holdens

  May 19, 2014 at 12:55 pm

  As always Many Many Thanks! I’m going to have a bit of fun trying to understand how these particular expressions work. Again THANKS!!!, and off to expression land I go!

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