[vtkusers] VtkVolumePicker choosing the edges of my volume

[Doug Hoppes]

Hi all,

                Okay, not sure what is going on here.  I have an image stack that is pretty dark with a semi-white blob in the center.  I would like to be able to select any point on that blob.

                I find that I can do this, if I turn the pickable setting of the volume off, and create an isosurface for the semi-white blob.  However, ideally, I would prefer to just use the vtkVolumePicker to select the blob, rather than having to spend the time creating the isosurface.

                When I try to click on the white area of the blob, I always get the edges of the volume.  Is there a way to ignore the volume's dark areas?  Since I don't know what the exact pixel values are, is there a way to define a range of pixels to ignore (i.e. ignore all pixels < 10 and pixels > 100)?

Doug
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20130314/4ec992c9/attachment.htm>