[vtkusers] vtkPointPicker

[Will Schroeder]

Hi Giancarlo -

>I have a question on how work the vtkPointPiker. I suppose that when I
>will pass the x y mouse coordinate to the Pick function, a ray start from
>where to where? I suppose from the camera position to the point specified
>by my mouse coordinate with z=0. Is it right?
>I suppose that the Pick fuction return the nearest point that the like
>intersect, is it right?

The point picker shots a ray in world space from the camera position 
through the display coordinate (x,y,z) (z is usually 0.0). The point within 
the pick tolerance and closest to the camera is the one selected.

Will

William J. Schroeder, Ph.D
Kitware, Inc.
469 Clifton Corporate Parkway
Clifton Park, NY 12065
will.schroeder at kitware.com
1-518-371-3971 x102
1-518-371-3971 (fax)