[vtkusers] Re: [vtk-developers] vtkContourWidget -- how to display 'off-plane' contours?

dean.inglis at camris.ca dean.inglis at camris.ca
Tue Feb 12 16:13:46 EST 2008

why do you have to do anything with the contour
rep?  Why not just get the polydata from the
rep (GetContourRepresentationAsPolyData) and find
the intersection of that with whatever plane?


> Subject: [vtk-developers] vtkContourWidget -- how to display 'off-plane'
> 	contours?
> As long as I'm asking hard questions, consider this scenario.
> My application maintains 3 orthogonal views of the same volume:
> Sagittal, Axial, Coronal.
> The advantage of using VTK is not having to write all the code that's
> already in VTK.  The disadvantage is that if you want to do something
> not currently done in VTK, you have to crack open a bunch of 'black
> boxes' and monkey around with the spaghetti wiring inside.
> Our old tracing application let you trace on one view (e.g. Sagittal),
> and in the other 2 views, it displayed the intersection of all the
> traced contours with the image plane of those other two views.
> So I'm in the unenviable position of cracking open the
> vtkContourRepresentation, and somehow finding the intersection of the
> contour and the plane of an orthoganal view, and then show the
> intersection.
> So I guess my question is this: How would I do this the VTK way?
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