[vtkusers] Extracted cross-section from vtkCutter cannot be displayed

[ochampao]

Here is the method which adds the sphere on the right view and then cuts the
cross-section to be displayed on the left view. 

void addPickedPoint(const double x, const double y, const double z)
{
	// sphere source
	vtkNew<vtkSphereSource> sphereSource;
	sphereSource->SetCenter(x, y, z);
	sphereSource->SetRadius(1.0);
	sphereSource->SetThetaResolution(50);
	sphereSource->SetPhiResolution(50);

	// sphere polygonal mapper
	vtkNew<vtkPolyDataMapper> sphereMapper;
	sphereMapper->SetInputConnection(sphereSource->GetOutputPort());

	// actor for displaying sphere in 3D
	vtkNew<vtkActor> sphereActor;
	sphereActor->SetMapper(sphereMapper);
	sphereActor->GetProperty()->SetDiffuseColor(1, 0, 0);
	sphereActor->GetProperty()->SetOpacity(0.7);

	// setup cut plane for extracting cross-sections of polygonal models.
	// Cutplane is the plane defined by the focal point and the view plane 
	// normal of the Left View.
	vtkNew<vtkPlane> cutPlane;
	cutPlane->SetOrigin(
		this->leftRenderer->GetActiveCamera()->GetFocalPoint());
	cutPlane->SetNormal(
		this->leftRenderer->GetActiveCamera()->GetViewPlaneNormal());

	// setup cutter and attach cutplane
	vtkNew<vtkCutter> cutter;
	cutter->SetCutFunction(cutPlane);
	cutter->SetInputConnection(sphereSource->GetOutputPort());
	cutter->Update();

	// crossection mapper
	vtkNew<vtkPolyDataMapper> cutterMapper;
	cutterMapper->SetInputConnection(cutter->GetOutputPort());

	// actor for displaying the extracted cross-section from the sphere
	vtkNew<vtkActor> cutterActor;
	cutterActor->SetMapper(cutterMapper);
	cutterActor->GetProperty()->SetDiffuseColor(0.2, .49, 1);
	cutterActor->GetProperty()->SetColor(1.0, 0.55, 0.2);
	cutterActor->GetProperty()->SetLineWidth(1.0f);
	cutterActor->GetProperty()->SetOpacity(1.0);
	
	// add all actors to the Renderers
	this->leftRenderer->AddActor(cutterActor);	
	this->rightRenderer->AddActor(sphereActor);

	// reset camera
	this->leftRenderer->ResetCamera();
	this->rightRenderer->ResetCamera();

	// render views
	this->leftRenderer->GetRenderWindow()->Render();
	this->rightRenderer->GetRenderWindow()->Render();
}



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