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

kent williams nkwmailinglists at gmail.com
Wed Feb 13 12:15:10 EST 2008

See, now that is why they pay you the big bucks, Dean!  I actually use
the ContourAsPolyData thinger to build a binary image from the contour
collection I build, but didn't think of it in this context.

I can certainly iterate through the points and find plane
intersections myself, but is there a VTK class or filter that will do
it for me.  I may not be the smartest tool in the shed, but I have
been looking through the documentation and not seeing anything

On Tue, Feb 12, 2008 at 3:13 PM,  <dean.inglis at camris.ca> wrote:
> 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?
>  Dean
>  > 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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>  > vtk-developers at vtk.org
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>  >

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