[vtkusers] Using vtkCutter to produce lines from a surface

[glennuggah]

Hi!

I'm using a vtkCutter to generate lines from a vtkPolyData surface. My
vtkPolydataSurface contains different colored regions. Is it possible to
grab the color information from the vtkpolydata surface to the output of the
vtkCutter? Cutting through my beautifully colored vtkPolyData regions
results in white lines.

Here is my code:

		vtkContourFilter* cf=vtkContourFilter::New();
		vtkPolyDataConnectivityFilter* pcf=vtkPolyDataConnectivityFilter::New();
		cf->SetInput(imageData);
		cf->SetValue(0,threshold);
		cf->ComputeScalarsOn();
		cf->Update();
		
		pcf->SetExtractionModeToAllRegions();
		pcf->ColorRegionsOn();
		pcf->SetInput(cf->GetOutput());
		pcf->Update();
		int numberOfRegions=pcf->GetNumberOfExtractedRegions();

		vtkPlane* plane=vtkPlane::New();
		plane->SetOrigin(Origin);
		plane->SetNormal(Normal);
		vtkCutter* cutter=vtkCutter::New();
		cutter->SetInput(pcf->GetOutput());
		cutter->SetCutFunction((vtkImplicitFunction*)plane);
		cutter->GenerateCutScalarsOff();
		cutter->Update();

		vtkPolyDataMapper* mapper0=vtkPolyDataMapper::New();
		mapper0->SetInput(cutter->GetOutput());
		mapper0->SetScalarVisibility(1);
		mapper0->SetScalarRange(0,numberOfRegions-1);
		vtkActor* actor0=vtkActor::New();
		actor0->SetMapper(mapper0);
		actor0->GetProperty()->SetLighting(false);
		ren0->AddActor(actor0);

		vtkPolyDataMapper* mapper1=vtkPolyDataMapper::New();
		vtkActor* actor1=vtkActor::New();
		mapper1->SetInput(pcf->GetOutput());
		mapper1->ScalarVisibilityOn();
		mapper1->SetScalarRange(0,numberOfRegions-1);
		actor1->SetMapper(mapper1);
		ren1->AddActor(actor1);



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