[vtkusers] vtkPointPicker

[Ashley Sher]

Hi all,

I'm trying out the class vtkPointPicker. There's a sample code from the
histor of this forum. I tried out and had a question. 

http://public.kitware.com/pipermail/vtkusers/2003-December/070818.html 

The sphere is used as a marker for the pick. When the program start up, the
sphere is already in view at a corner of the cube. Is it possible to make it
invisible until user picks on the points?

Thanks! =)
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