• Adobe After Effects

  Expression Order?

  Posted by Ocean Byrne on July 12, 2011 at 6:32 pm

  I set up an expression to fade a bunch of 3d layers based on their distance from the camera, it works fine and all is groovy.

  then I set up an expression to position those layers based on a slider, it also seems to work, and is similarly groovy.

  EXCEPT – now the opacity expression doesnt work. It still thinks it’s valid, but the opacity is staying at 0?

  If I kill the position expression, the opacity works, is there some way I can specify to do the position 1st, and then think about opacity?

  Waa! ?

  Here are the expressions I have on every layer:

  Opacity:
  startFade = 1000;
  endFade = 111;
  L = thisComp.layer(“Camera 1”);
  d = length(L.position,position);
  if ( d > endFade )
  { linear(d,startFade,endFade,100,0) }
  else
  { linear(d,endFade,0,0,100) }

  Position:
  [1824,1368, (index-2) * thisComp.layer(“2008-11-07_19.02.19.jpg”).effect(“Slider Control”)(“Slider”) ]

  Any help would be much oblidged.

  Ocean Byrne replied 14 years, 10 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  July 12, 2011 at 8:26 pm

  I think there must be something else going on. Have you verified that the position expression actually positions the layers where they should be visible?

  Dan
• 

  Ocean Byrne

  July 12, 2011 at 10:03 pm

  Huh, well that does seem to be the problem. Thank you sir.

  I zeroed out all the X’s and Y’s of the picture layers and the camera and it seems to work.

  I dont really understand though. Originally X was 1824 and Y was 1368 (center of the images)for all the layers and the camera, and the opacity expression worked fine. Once I added the pos expression though it went south.

  Functioning now though, weather I understand or not. Thanks.

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