• Adobe After Effects Expressions

  Randomise Position based on layer marker

  Posted by Rosie Skinner on April 12, 2018 at 3:00 pm

  Hi everyone!

  I have this script for randomising the position on a layer

  random([thisComp.width,thisComp.height])
  
  but I’d really like the position to change at a layer marker… anyone got any ideas?

  Thanks!

  Rosie Skinner replied 8 years, 1 month ago 2 Members · 4 Replies
• 4 Replies

• 

  Dan Ebberts

  April 12, 2018 at 4:02 pm

  Try this:

  
m = marker;
n = 0;
if (m.numKeys > 0){
n = m.nearestKey(time).index;
if (m.key(n).time > time) n--;
}
seedRandom(n,true);
random([thisComp.width,thisComp.height])


  Dan
• 

  Rosie Skinner

  April 12, 2018 at 4:08 pm

  Genius! Thank you!!

  If you have a bit of time would you mind explaining it?

  No worries if not!
• 

  Dan Ebberts

  April 13, 2018 at 12:34 am

  It looks for the most recent, previous marker and uses that marker’s index as the random seed (it uses zero, if there is no previous marker).

  Dan
• 

  Rosie Skinner

  April 13, 2018 at 9:18 am

  Great thanks so much!

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