• Adobe After Effects Expressions

  Expression that links fast blur to Camera position?

  Posted by Tara Devlin on October 6, 2016 at 7:25 pm

  Hi Everyone,

  Forgive me. I basically stumble my way around expressions and beg for help when I’m over my head. Does anyone have a quick expression that links fast blur to the distance or position of a camera – or can point me in the right direction?

  I found this but it’s not working quite like I need it to.

  // Blur from Distance to Camera
  dist = length(thisComp.layer(“Camera 1”).position, position);
  B = dist/100;
  [B]

  I attached it to the “Bluriness” of “Fast Blur” but the blur doesn’t seem to change when I move the camera around.

  The thing is, I have a ton of layers in z space spread out like a grid. The camera is flying around as some of these layers take center stage and others go back.. The ones that aren’t featured need to go out of focus a little. I can do it by hand, of course, but I think it would be much more realistic with an expression (not to mention less time consuming).

  Thank you all for any help!

  Best,

  Tara

  // Blur from Distance to Camera
dist = length(thisComp.layer("Camera 1").position, position);
B = dist/100;
[B]

  Stefan Zerdzinski replied 7 years, 11 months ago 4 Members · 4 Replies
• 4 Replies

• 

  Dan Ebberts

  October 6, 2016 at 7:34 pm

  I’d think you might have better luck using the camera’s POI, like this:

  dist = length(thisComp.layer(“Camera 1”).transform.pointOfInterest, position);
  dist/100;

  Dan
• 

  Tara Devlin

  October 6, 2016 at 7:53 pm

  Thank you, Dan, for such a quick response! I don’t think that’s doing it for me either, unfortunately. I’m not using POI on my camera.
• 

  Kevin Camp

  October 6, 2016 at 8:33 pm

  I’ve used Dan’s light fall-off expression (slightly modified) for fake DOF…

  decay = .005;
noBlur = 3000;

  L = thisComp.layer("Camera 1");

  d = length(L.transform.position,transform.position);
if (d < noBlur){
0;
}else{
(d - noBlur)*decay;
}
  just change the decay and noBlur values as needed.

  Kevin Camp
  Art Director
  KCPQ, KZJO & KRCW
• 

  Stefan Zerdzinski

  May 24, 2018 at 1:46 pm

  Thank you for this from the distant future (2018). It helped out greatly.

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