• Adobe After Effects Expressions

  Expression to change relative value

  Posted by John Felt on July 31, 2009 at 7:40 pm

  Hello

  Quick question (perhaps) here. Is there a way for an expression to affect the relative position of something, rather than create an absolute position based on time?

  So for example I want the asset to jump 100 pixels to the left every second on the second. Rather than write out a time equation that bases the location on the time is there a way to say, “Every second move the asset 100 pixels to the left,” rather than say posterizeTime(1); position[0]-100*time?

  (The example is not really what I’m doing, if it were this simple then there would be no need)

  Thanks so much. I am sort of new to expressions, so all this help is hugely helpful.

  Thanks again
  John

  John Felt replied 16 years, 9 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  July 31, 2009 at 8:22 pm

  Since expressions can’t pass information from one frame to the next, I think something like this is the best you’re going to do:

  value – [Math.floor(time)*100,0]

  Dan
• 

  John Felt

  July 31, 2009 at 8:27 pm

  That makes sense, thanks.

  John

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