• Adobe After Effects Expressions

  Linking CC sphere to camera motion

  Posted by Steve Dorsey on January 12, 2009 at 8:59 pm

  
  lookAt(thisComp.activeCamera.position, position)[0]
  lookAt(thisComp.activeCamera.position, position)[1]
  lookAt(thisComp.activeCamera.position, position)[2]

  Okay, please bear with me here. I’m (clearly) not an expressions guy, but I need to get this done asap.

  I have a comp where I’m using CC sphere to “be” inside a spherical background. I want the background to move when the camera moves.

  I posted to the adobe forums, and I got back a reference to a YouTube movie

  https://www.adobeforums.com/webx/.59b77e3d/1

  That script got me half way there.

  My camera is parented to a null which is animated. The camera actually has no keyframes or expressions applied to it.

  The current expression is applied to the CCsphere X Y and Z rotation attributes and links to the camera position:

  lookAt(thisComp.activeCamera.position, position)[0]
  lookAt(thisComp.activeCamera.position, position)[1]
  lookAt(thisComp.activeCamera.position, position)[2]

  This is great, but I need it to be linked to the rotation of the camera’s null, not the position of the camera. I’m trying to figure this out with no success. Any ideas?

  Thanks

  ———-S

  Trent Armstrong replied 17 years, 6 months ago 3 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  January 12, 2009 at 11:03 pm

  Try changing your expressions to this:

  lookAt(thisComp.activeCamera.toWorld([0,0,0]),position)[0]

  lookAt(thisComp.activeCamera.toWorld([0,0,0]),position)[1]

  lookAt(thisComp.activeCamera.toWorld([0,0,0]),position)[2]

  Dan
• 

  Trent Armstrong

  January 14, 2009 at 6:33 pm

  cam = -thisComp.layer("Camera 1").transform.xRotation;
  nul = -thisComp.layer("Null 2").transform.xRotation;
  cam + nul

  Not trying to interfere with the genius of Dr. Ebberts, but the following code worked for me pretty well.

  Trent

  Trent Armstrong – Creative Cow Leader
  https://www.dallasaeug.com

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