[vtkusers] Assign colors to lines of vtkPolyData with cell type polygon.

[kenichiro yoshimi]

Hello Martijn,

The vtkPolyDataConnectivityFilter provides a simple way to assign
colors to regional rings. I hope the attached example will help you.
Also here are the examples for reference.
https://lorensen.github.io/VTKExamples/site/Cxx/Modelling/ContourTriangulator/
https://lorensen.github.io/VTKExamples/site/Cxx/PolyData/ExtractOutsideSurface/

Thanks

2017-11-24 5:52 GMT+09:00 Martijn Koopman <koopman.mk at gmail.com>:
> Hello,
>
> I have a vtkPolyData which cell types are polygons.
> Is it possible to color individual lines of such a vtkPolyData?
>
> I know it is possible to color individual cells by creating a data array,
> setting it as cell data and calling
> vtkPolyDataMapper::SetScalarModeToUseCellData().
>
> However, the cells of the polydata are polygons, not lines.
>
> Some background information:
> First I read polygons from a file. Each polygon consists of an exterior ring
> and zero or more interior rings.
> I construct a vtkPolyData with these rings as lines and use
> vtkContourTriangulator to form the polygons.
> vtkContourTriangulator returns a vtkPolyData with polygons ofcourse.
>
> Afterwards I want to assign a color only to those lines that constitute the
> interior and exterior rings, not the lines that make up the triangulation.
>
> Thanks in Advance,
> Martijn
>
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