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Using expressions can the "text" property of a text layer read a transform value of its position.
In other words I want to display transform data (x,y, z) of a tracking point on top of footage at that point as that point moves... As a form of data vizualization of tracking points.
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What do you mean by "text property" of a Text Layer?
If you want to display, in the Comp Panel, the values/data for a layer, say, Layer>Transform>Position then all you have to do is drag that property, from the timeline into the Comp Panel.
HTH
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Could be as trivial as inserting a
mRef=thisLayer.transform.position;
mRef[0]+\r+mRef[1]+\r+mRef[2]
into the source text property. Of course you may need some extra code to not end up with endless number salad like adding toFixed() or a rounding function for the decimals, but as Roland already said, that would require a better explanation of what you are actually trying to do.
Mylenium