[vtkusers] How to draw a checkered floor in VTK?

[alican]

I have tried to do it with vtkQuad, based on  this example
<http://www.vtk.org/Wiki/VTK/Examples/Cxx/GeometricObjects/Quad>  , however 
nothing is drawn.

	// Add the points to a vtkPoints object
	vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
	vtkSmartPointer<vtkCellArray> quads = vtkSmartPointer<vtkCellArray>::New();
	for (int i = 0; i < 3; i++)
	{
		// Create four points (must be in counter clockwise order)
		double p0[3] = { 0.0, 0.0, 0.0 };
		double p1[3] = { 1.0*i, 0.0, 0.0 };
		double p2[3] = { 1.0*i, 0.0, 1.0*i };
		double p3[3] = { 0.0, 0.0, 1.0*i };

		points->InsertNextPoint(p0);
		points->InsertNextPoint(p1);
		points->InsertNextPoint(p2);
		points->InsertNextPoint(p3);

		// Create a quad on the four points
		vtkSmartPointer<vtkQuad> quad = vtkSmartPointer<vtkQuad>::New();
		quad->GetPointIds()->SetId(0, 0);
		quad->GetPointIds()->SetId(1, 1);
		quad->GetPointIds()->SetId(2, 2);
		quad->GetPointIds()->SetId(3, 3);

		// Create a cell array to store the quad in
		quads->InsertNextCell(quad);
	}

	// Create a polydata to store everything in
	vtkSmartPointer<vtkPolyData> polydata =
vtkSmartPointer<vtkPolyData>::New();

	// Add the points and quads to the dataset
	polydata->SetPoints(points);
	polydata->SetPolys(quads);
	// Setup colors
	unsigned char red[3] = { 255, 0, 0 };
	unsigned char green[3] = { 0, 255, 0 };
	unsigned char blue[3] = { 0, 0, 255 };

	vtkSmartPointer<vtkUnsignedCharArray> colors =
vtkSmartPointer<vtkUnsignedCharArray>::New();
	colors->SetNumberOfComponents(3);
	colors->SetName("Colors");
	colors->InsertNextTupleValue(red);
	colors->InsertNextTupleValue(green);
	colors->InsertNextTupleValue(blue);

	polydata->GetPointData()->SetScalars(colors);
	// Add the points and quads to the dataset
	polydata->SetPoints(points);
	polydata->SetPolys(quads);

	// Setup actor and mapper
	vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
	mapper->SetInputData(polydata);

	vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
	actor->SetMapper(mapper);

	// Setup render window, renderer, and interactor
	m_pRenderer->AddViewProp(actor);




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