If you are animating the position of your 0-layer, you might be having a problem adding arrays. The problem is that some properties, like position, call for an array of all three axes [x,y,z] rather than for just one axis. So when you add the position of your null to the position of your layer, your...

If you need a fast solution, set two keyframes for the spinning motion, and try this expression on the 'shift center to' property of Offset: freq = 10; amplitude = 25; decay = 5.0; t = time - key(numKeys).time; x = scale[0] + amplitude*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t); if (time < key(num...

I would check Dan Ebberts' amazing expression site Motionscript.com. After going through the basics of expressions, check out the section on physical simulations: http://www.motionscript.com/mastering-expressions/simulation-basics-3.html Using sine waves and exponential decay, you should be able to ...

Very neat expression, Lloyd. To clarify for people who are seeing this expression for the first time, the 'reset' part of the code is to keep the value on "ShiftCenterTo" from becoming astronomically high. Effects in some versions of After Effects don't handle high numbers well. As a sugge...

Try this expression. Your value should offset itself by the height of your comp, so it should look like a continuous value stream, but within the confines of your comp height. Offset: fps= 24; t=time * fps; move= t * thisComp.height; reset=Math.floor(move/thisComp.height); moveReset=move-reset*thisC...

The problem is that in 3d, rotation becomes three separate properties that represent the X Y and Z axes, and orientation includes data for all three axes in the one property. So, if you paste a keyframe from rotation Z onto orientation, orientation wants [X,Y,Z] rather than just [Z]. If you have a l...

Try putting this on your layers rather than precomposing them: accellMultiplier=5; x=position[0]; y=position[1]; z=position[2]+(time-(Math.exp(time*accellMultiplier))); [x,y,z] This expression causes your layer to move backwards in z space exponentially over time. accellMultiplier lets you affect wh...

There may be an easier way of writing this, but this should show you how you can access different index values of arrays. yourCamera=thisComp.layer("Camera 1"); yourCameramovement=yourCamera.position[2]-yourCamera.position.valueAtTime(0)[2]; layerSpeed=0.1; x=position[0]; y=position[1]; z=...

Does anyone know of a way of accessing a color value at a specific point on a layer or in the comp window within an expression, like an eyedropper that samples and returns a color every frame?