[vtkusers] pb displaying vertex and vertices

[Matthieu Chabanas]

I have a (stupid) problem to display first a single 3D point, then a set
of points.

I have tried to port the example given in
Examples/DataManipulation/Tcl/BuildUGrid.tcl to c++,
but I can't see anything displayed...

I use vtk4.0 + Qt2.3 + vtkQGL. For this particular example, I have tried
with Visual C++ also, but same results.

Am I missing something completely silly?

Thanks for any help.
Matt


---


//--- A SINGLE POINT:
	vtkPoints * vertexPoints = vtkPoints::New();
	vertexPoints->SetNumberOfPoints(1);
	vertexPoints->InsertPoint(0, 1.0, 1.0, 1.0);

	vtkVertex * aVertex = vtkVertex::New();
	aVertex->GetPointIds()->SetId(0,0);

	vtkUnstructuredGrid * aVertexGrid = vtkUnstructuredGrid::New();
	aVertexGrid->Allocate(1, 1);
	aVertexGrid->InsertNextCell(aVertex->GetCellType(),
aVertex->GetPointIds());
	aVertexGrid->SetPoints(vertexPoints);

	vtkDataSetMapper * aVertexMapper = vtkDataSetMapper::New();
	aVertexMapper->SetInput(aVertexGrid);
	
	vtkActor * aVertexActor = vtkActor::New();
	aVertexActor->SetMapper(aVertexMapper);
	aVertexActor->AddPosition(0, 0, 6);
	aVertexActor->GetProperty()->SetDiffuseColor(1, 1, 1);

// A SET OF POINTS
	vtkPoints * polyVertexPoints = vtkPoints::New();
	polyVertexPoints->SetNumberOfPoints(3);
	polyVertexPoints->InsertPoint(0, 0, 0, 0);
	polyVertexPoints->InsertPoint(1, 1, 0, 0);
	polyVertexPoints->InsertPoint(2, 1, 1, 0);

	vtkPolyVertex * aPolyVertex = vtkPolyVertex::New();
	aPolyVertex->GetPointIds()->SetNumberOfIds(3);
	aPolyVertex->GetPointIds()->SetId(0, 0);
	aPolyVertex->GetPointIds()->SetId(1, 1);
	aPolyVertex->GetPointIds()->SetId(2, 2);
  
	vtkUnstructuredGrid * aPolyVertexGrid = vtkUnstructuredGrid::New();
	aPolyVertexGrid->Allocate(1, 1);
	aPolyVertexGrid->InsertNextCell( aPolyVertex->GetCellType(),
aPolyVertex->GetPointIds());
	aPolyVertexGrid->SetPoints(polyVertexPoints);
	
	vtkDataSetMapper * aPolyVertexMapper = vtkDataSetMapper::New();
	aPolyVertexMapper->SetInput(aPolyVertexGrid);

	vtkActor * aPolyVertexActor = vtkActor::New();
	aPolyVertexActor->SetMapper(aPolyVertexMapper);
	aPolyVertexActor->AddPosition(2, 0, 6);
	aPolyVertexActor->GetProperty()->SetDiffuseColor(1, 1, 1);


  // The usual rendering stuff.
	vtkCamera *camera = vtkCamera::New();
	camera->SetPosition(0,0,6);
	camera->SetFocalPoint(0,0,0);

	vtkRenderer *renderer = vtkRenderer::New();
	vtkRenderWindow *renWin = vtkRenderWindow::New();
	renWin->AddRenderer(renderer);

	vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
	iren->SetRenderWindow(renWin);

	renderer->AddActor(aVertexActor);
	renderer->AddActor(aPolyVertexActor);

	renderer->SetActiveCamera(camera);
	renderer->ResetCamera();
	renderer->SetBackground(1,1,1);
  
	renWin->SetSize(300,300);

	// interact with data
	renWin->Render();
	iren->Start();