[vtkusers] Picking points by clicking on them

[Doug Hoppes]

Hey all,

                I have a system where I have around 100,000 points displayed in the window.  The use would like to physically click on a point to select it.  Right now, I use the vtkAreaPicker to let the user marquee around the points to select them.  When they try to physically click on a point, it's too small for them select.

                Now, I could create a small sphere around each marker (using the vtkGlyph3D object) and make the sphere almost transparent and pickable. The issue is that we have found that a glyph3D sphere with 4 sides with 100,000 points brings the system to a crawl. So, I'm trying to figure out if there is some sort of really lightweight object that I can put around the point that is semi-transparent, pickable, and the user can select with the vtkcellpicker.... Or if there is another way to do this?

Doug

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