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

[Martijn Koopman]

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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