• Adobe After Effects Expressions

  number of layers distribute up opacities

  Posted by Bert Brown on May 27, 2008 at 7:57 pm

  i’m trying to make a trail of squares rain down.

  i want it to be expandable later, so i want to utilize “thisComp.numLayers” to distribute opacity.

  so if there are 5 layers, i want index 1 to be 100%, index to be 80%, index 3 to be 60%, etc.

  but if i want to do 6 layers, it would automatically switch them to 100, 84, 68, and so on.

  i’m stuck trying to be get this backwards. i’m using (index-1)…valueAtTime(time-X) so the order is important.

  if anyone has any other advice on how to make a Matrix-y, squares raining down with trails grid, that’d be great too. i just think i need a “math person” for this specific hurtle

  ———————————-

  peep my over-the-interweb band, red abbott.
  “we electro-rock over long distances…”

  Bert Brown replied 18 years, 2 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  May 27, 2008 at 8:29 pm

  Try this:

  n = thisComp.numLayers;
  (n – index+ 1)*100/n

  Dan
• 

  Bert Brown

  May 27, 2008 at 8:33 pm

  ah yes. works perfectly. i knew it would involve the variable twice, but i just couldnt get there. i think what i was really missing was the idea of adding 1 to the index

  thanks, dan!

  ———————————-

  peep my over-the-interweb band, red abbott.
  “we electro-rock over long distances…”

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