mplot3d: How to convert a 3D coordinate to a 2D view coordinate

I want to annotate a 3D point when I use a mouse to click it. In order to
know which point I am clicking, I am thinking to compare the mouse 2d
coordinate and that for this point. But I don't know how to get the 2D view
coordinate for this point. Does any one know how to do this? Or you have any
a better way to annotate 3d points? Thank you very much!

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