help with mouse as tracker position

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Thanks for your help but i also need a function similar to getPosition that will give me an information about the z coordinate of the mouse so i don't understand how does the getPoition methode can solve my problem.
I found in vizconnect a tracker "mouse speen wheel" but according to the information provided by the vizconnect the x coordinate is replaced by the x coordinate. Is there any tracker in vizconnect or another methode in viz.mouse that can give x,y,z coordinates?