[vtkusers] How to get voxel value from vtkImageData using C++?

[dean.inglis at camris.ca]

Yi-Yu,

Have a look at vtkImagePlaneWidget's two methods:

void vtkImagePlaneWidget::UpdateCursor()

and 

int vtkImagePlaneWidget::GetCursorData(double xyzv[4])


this is one way to get what you're after...another is to look 
at vtkProbeFilter - see the tcl example I posted earlier:
http://public.kitware.com/pipermail/vtkusers/2004-January/021528.html

Dean