[vtkusers] SetRepresentationToPoints and picking the points

[Doug Hoppes]

Thanks for the info... the Interaction/Point Picker (need to do this in my vtkvolume that is using the SetRepresentationToPoints() method) seems to produce some results.  However, not sure what's going on.  I have a totally black image with a small white box in the center of the image.  I can pick points outside of the white box.  From the description of the point picker, I was thinking that it would only interact with any points on the white box, not my black area of the image.

More investigation to do.

Doug

From: David Doria [mailto:daviddoria at gmail.com]
Sent: Friday, February 03, 2012 11:38 AM
To: Doug Hoppes
Cc: vtkusers at vtk.org
Subject: Re: [vtkusers] SetRepresentationToPoints and picking the points

On Fri, Feb 3, 2012 at 11:32 AM, Doug Hoppes <dhoppes at mbfbioscience.com<mailto:dhoppes at mbfbioscience.com>> wrote:
Hi all,

                Hopefully this is a simple question.  I have an image that I represent on the screen as points (using SetRepresentationToPoints()).  I would like the user to be able to select one of those points.  I was thinking that I could use the vtkPointPicker, but nothing seems to be ever selected.

                Any idea what class/example would do the trick?

Doug

If you have a 2D image, you can pick directly on the image without having to represent it as points:

http://www.vtk.org/Wiki/VTK/Examples/Cxx/Images/PickingAPixel
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Images/PickingAPixel2

Otherwise I think you'll want something like this:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/PointPicker
David
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