[vtkusers] Problem with vtkContourTriangulator and vtkPlaneCutter

[Jeffery Lewis]

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.



[cid:image013.png at 01D3B236.CFCA0DE0]

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Jeffery Lewis
Staff Software Engineer, Treatment Planning Systems

1310 Chesapeake Terrace
Sunnyvale, CA 94089
USA
Tel: 1.408.789.4367
jlewis at accuray.com




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