SourceRectAtTime() Expression- Adobe After Effects tutorial

The new sourceRectAtTime() can get you the width and height of text and shape layers. It’s new but it’s good. If you have Ae CC 2014.2 (aka then you can enjoy this. If you don’t have that option open and you want to make solids resize to text you should check out an older tutorial on this site.


This tutorial also talks for a long time about expressions in general, so if you’re not into that… get out now!


This is the expression we wrote on the size:
s=thisComp.layer(“Hello people”);


This is the expression we wrote on the position:
content(“Rectangle 1”).content(“Rectangle Path 1”).size/2


If you have any questions just let me know in the comments.


Download this project file:

This file ONLY works in After Effects 13.2 and newer.

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1 Comment

  • Robert

    21.02.2016 at 02:02 Reply

    I added a wiggle to the anaitmor that was doing 3D position. The mode was Add and I keyed Min 0 at start and finish and then keyed -15 in the middle and it gave and nice little one bounce effect.Not Inertial but not bad!

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