• Adobe After Effects Expressions

  Refrence keyframes regarless of position on the timeline

  Posted by Brennanc on October 12, 2007 at 3:19 pm

  Hey hey all.

  First off, thanks for the scaling expression Dan, I modified it a bit to compensate for the vagueness of my original description.

  I have another quick question though. I created a null object with a slider that has only 2 keyframes, first @ 00:00 with a value of 90 and the second @ 6 seconds with a value of 100.

  My subsequent layers start every 6 seconds but i would like them to reference the animation from the null. Here’s what i have so far…

  Scale = thisComp.layer(“ScaleUp”).effect(“Slider Control”)(“Slider”);

  if(width < height) { y = thisComp.height*thisComp.pixelAspect/(height*source.pixelAspect); x = y; } else { x = thisComp.width*thisComp.pixelAspect/(width*source.pixelAspect); y = x; } [x,y]*Scale;

  So how do I tell it to grab the sliders value from the first 6 seconds regardless of where this layer is on the timeline?

  Thanks so much!

  -Brennan

  Brennanc replied 18 years, 6 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Dan Ebberts

  October 12, 2007 at 5:00 pm

  Try changing your first line to this:

  Scale = thisComp.layer(“ScaleUp”).effect(“Slider Control”)(“Slider”).valueAtTime(time – inPoint);

  By the way, you shouldn’t be using pixelAspect correction on height values, just width (I think).

  Dan
• 

  Brennanc

  October 12, 2007 at 5:19 pm

  That’s the money. Thanks a bunch!

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