Parallax offset from a tracked Null


trackLayer = thisComp.layer("MotionTracked")
trackPosition = trackLayer.transform.position
trackDiff = trackLayer.transform.position.valueAtTime(trackLayer.inPoint)
trackAdd = trackPosition - trackDiff
transform.position +trackAdd*.5

I use this expression to add a parallax offset to a motion track. Apply your track to a Null called MotionTracked and crop the layer inPoint to your reference point.

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