Aligning Particular motion paths

Red Giant posted QuickTip #25: Aligning Particular Motion Paths:

Motion paths in Particular can be tricky. Harry Frank brings you this overview of how to set them up, and a foolproof way to align the spline in 3D space with a simple expression. ...There's also a preset for AE CS4+, to use (with a try/catch thing so it doesn't error). Expressions used in this tutorial:

Particular Emitter Position XY:

pos = thisComp.layer("Motion Path 1").position.valueAtTime(0);[pos[0], pos[1]]

Particular Emitter Position Z:

thisComp.layer("Motion Path 1").position.valueAtTime(0)[2]

Red Giant QuickTip #25: Aligning Particular Motion Paths from Red Giant Software on Vimeo.