• Adobe After Effects

  Layer opacity based on proximity to a camera.

  Posted by Andrew Kramer on October 28, 2006 at 2:06 pm

  I’m trying to automate an effect, where as a layer gets within 100 pixels of a camera it begins to fade out and at say 10 pixels it disappears. It will probably fade back up when the layer passes the camera but that’s okay.

  The idea is that when a camera is pushed through 3d layers they will autmatically fade out.

  Any help will sure save me some time… Thanks,
  Andrew Kramer

  Andrew Kramer replied 19 years, 9 months ago 3 Members · 3 Replies
• 3 Replies

• 

  Brian Charles

  October 28, 2006 at 3:59 pm

  A bit of a kludge but this works bases on Z position, won’t work otherwise. Attach to Opacity of layer.

  T = 100;
  camZ = thisComp.layer(“Camera 1”).transform.position[2];
  myZ = transform.position[2];
  diff = 100 -(camZ+myZ);
  if (diff > ( 20)) {
  T = diff ;
  }else{
  if (diff < 0); T = 0; } T
• 

  Dan Ebberts

  October 28, 2006 at 4:03 pm

  This should do it:

  dist = length(position,thisComp.layer(“Camera 1”).position);
  linear(dist,10,100,0,100)

  Dan
• 

  Andrew Kramer

  October 28, 2006 at 4:47 pm

  Very Cool! Thanks for your help guys.

  Brian, very Ambitious, but as you probably guessed I need to have it work from every axis, although I think I have learned how to arrange an “if” scenario.
  Dan your script is like candy. I’ve printed it up and am going to enjoy it tonight after dinner. Beautiful.

  Thanks again buys,
  Andrew

Reply to this Discussion! Login or Sign Up