Animate Z position with write on behavior

I'm looking to animate the Z position (and X,Y) of a shape that's using write on behavior. i don't want the whole shape's Z position to shift to the new position, i only want it to apply to the section that's currently being 'written on'.
something like this video:
http://www.apple.com/finalcutstudio/motion/effortless-graphics.html#overlay-shad ows
motion 4.

Actually, what's clear in that video is that they are not using a shape at all to generate the light trail. Shapes are only 2D or local 3D which means that they'll obey layer order, not Z depth if drawn along that axis. Only replicators and particle emitters can react as the light in the video does. They probably used a particle emitter.
To get a light streak to mimic that video, you need to create an emitter from a circle or similar shape (highly feathering it helps it look like it's glowing). Change the emitter to 3D (Global, not local) and the speed to 0. Change the life to something short like 1.5 seconds.
Then use the Motion Path behavior to animate the emitter around the various layers in 3D space.
Having the speed at 0 means that although the emitter is moving, each dot that it emits stays put until it dies. With a high birth rate, it looks like a streak of light.
There are many more things done to make that light streak including color, blending and trailing off the end, but those are the basics.
Andy

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