Pickpoint doesn't hit objects in 3D scene

Hi all,

I have a 3D graphics space on which I draw and manipulate several cubes. I am trying to use pickpoint to allow the user to interactively click on the objects, and have reproduced the steps outlined in https://decibel.ni.com/content/docs/DOC-4958, which is remarkably similar to my application. Even so, pickpoint hit always returns false.  Does anyone have any ideas why this could be happening, i.e. pickpoint uses a different coordinate system or is dependent on scene rotation/translation?

Thanks!