[vtkusers] Problem with vtkContourTriangulator and vtkPlaneCutter

[David Gobbi]

Hi Jeffery,

I can get your example to work by providing a tolerance to vtkCleanPolyData:

        polygonsContourClean->SetTolerance(1e-6);

A better fix is to clean the toroid itself:

vtkSmartPointer<vtkCleanPolyData> clean =
vtkSmartPointer<vtkCleanPolyData>::New();
        clean->SetInputConnection(source->GetOutputPort());
        clean->SetTolerance(1e-4);

The parametric surface has duplicate points where it joins back on itself.
If vtkCleanPolyData isn't given a tolerance, it uses its default tolerance
of zero, and isn't able to resolve the duplication.

 - David




On Fri, Mar 2, 2018 at 3:57 PM, Jeffery Lewis <jlewis at accuray.com> wrote:

> I have a prototype that generates a super toroid surface model. A cut
> plane is defined to be orthogonal to the camera line of sight, and cuts
> through the middle of the surface model. The cut contour (generated by
> vtkCutter), and filled cut contour (generated by vtkContourTriangulator) is
> rendered with the surface model. The surface model is shown transparent as
> it is only a reference. The rendering of interest is the cut contour (shown
> as red contour) and filled cut contour (shown as green). Moving the mouse
> rotates the surface model. The cut plane stays orthogonal to the camera
> while the surface model rotates. By rotating the surface model, you can see
> the cut contour and filled cut contour get updated interactively as it
> slices through the middle of the surface model.
>
>
>
> Unfortunately, the filled cut contour does not look right and I can’t seem
> to figure it out. If I change the surface model to something simpler like a
> cone, then everything looks fine.
>
>
>
> Also of note is that if I switch out the vtkCutter with a vtkPlaneCutter,
> the program crashes. I would like to use the vtkPlaneCutter since from its
> documentation seems to indicate that it will get better performance. The
> vtkPlaneCutter crashes using either the super toroid or cone.
>
>
>
> Attached is the source code. The stuff between “// Setup a slider widget
> for each varying parameter BEGIN” and “// Setup a slider widget for each
> varying parameter END” can be ignored as this only involves setting up
> sliders to manipulate the super toroid, which comes from the
> ParametricSuperToroidDemo example. The setup of the pipleline for the cut
> contour and filled cut contour is near the bottom.
>
>
>
> Also attached is a sample screen shot of the incorrect filled cut contour.
>
>
>
>
>
>
>
>
>
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>
>
>
> *Jeffery Lewis*
>
> Staff Software Engineer, Treatment Planning Systems
>
>
>
> 1310 Chesapeake Terrace
>
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>
> USA
>
> Tel: 1.408.789.4367 <(408)%20789-4367>
>
> *jlewis at accuray.com <jlewis at accuray.com>*
>
>
>
>
>
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