• Adobe After Effects Expressions

  Setting a Time Limit

  Posted by Rajarshi Basu on June 15, 2009 at 12:28 am

  Hi,

  In this Eran Stern tutorial,

  https://library.creativecow.net/articles/stern_eran/Promo_Breakdown_Part_1/video-tutorial.php

  he uses an expression for movement.

  time*2

  Suppose I have a 10 second composition and I want this movement to last for only 5 secs, how would I do this ?

  Raj

  Rajarshi Basu replied 17 years, 2 months ago 2 Members · 3 Replies
• 3 Replies

• 

  Filip Vandueren

  June 15, 2009 at 12:52 am

  multiple ways to do it.
  Something like this will work:

  
t=Math.min(t,5);
t*2;


  Math.min takes the smallest value,
  so as long as time<5 t=time, if time>5, t stays at 5

  another way:

  
t=linear(t,0,5,0,5);
t*2;


  this reads harder, but has the exact same result.
  But, you can change the linear() to ease() and you won’t get a sudden stop.
• 

  Filip Vandueren

  June 15, 2009 at 12:53 am

  sorry, that should have been:

  
t=linear(time,0,5,0,5);
t*2;

• 

  Rajarshi Basu

  June 15, 2009 at 5:13 am

  Hey man, thanks a lot.

  t=linear(time,0,5,0,5);
  t*2;

  so, if in my comp of 10 secs if I want it to affect only till 3 seconds…

  then t=linear(time,3,5,10,5)
  t*2

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