I’m sure there’s a reasonable explanation. It seems counterintuitive, but that’s math for you. The lower the decay, the longer it takes to come to a rest. The higher the frequency, the faster it swings. The only values you need to worry about are the frequency (the freq variable) and the decay. Value + amp*(Math.sin(t*w)/Math.exp(decay*t)/w) This is all done with trigonometry, and if you don’t understand, don’t worry, we don’t either! This can be applied to position, rotation or scale properties:Īmp = velocityAtTime(key(n).time. When you rotate the parent layer, the child layer rotates with it and replaces the parent’s text when the parent goes past 90º in either direction.Īnother expression by the brilliant Dan Ebberts, this one slows an animation down gradually, overshooting, going backwards, overshooting a little less, going backwards a little less, until coming to a rest, like a pendulum. Set the initial y-rotation property of the child layer to 180.Apply the expression to the opacity layer of each.Take two layers and parent one to the other.We typically use this to change text on screen, like this: This expression gets applied to the Opacity property ( after effects expressions ):īasically, when applied to the opacity property, the expression makes the layer invisible when it rotates away from the camera. It was written by Dan Ebberts, an After Effects Expression /Scripting zen guru maestro, who always has an answer to any question on the After Effects boards. It’s actually called “Layer Invisible When Facing Away From Camera”, but we call it the Ebberts Facing Away Expression. We use expressions all the time and here are our top five (after effects expressions): Ebberts Facing Away Expression In traditional animation, this was called tweening, but we just call it awesome.Īfter effects expressions can be used to modify animations in the tweening process or to set values of properties based on other factors. The program automatically changes the scale between the keyframes, so you don’t have to do it automatically. For example, animating the scale of a graphic from 0 to 100 takes two keyframes, one set to 0% and one set to 100%. If you’re unfamiliar, a keyframe in animation is a point in the timeline where a property changes. It’s a very versatile tool that allows anyone with a passing understanding of Photoshop or Illustrator to jump in and start animating, and one of the things that makes it so versatile is the ability to apply expressions.Īfter effects expressions are bits of code that are written in JavaScript and can be applied to any parameter that you can keyframe. We use After Effects expressions for all of our video graphics.
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