[vtkusers] Labeling points of an unstructured grid

[Jochen]

Hi all,

I would like to label all points of an unstructured grid with their original
id. This sounds like easy to accomplish. I'm running out of any idea what
I'm doing wrong. And to be honest, I'm out of order now. Hopefully there is
somebody out there, who can help me.

(my context: vtk 5.8.0, activiz, c#)

As soon as I add /vtkUnstructuredGridGeometryFilter/-filter points are
labeled with wrong ids.
In the case I use the pure grid as input for /vtkIdFilter/ everything is
fine except that I see labels for inner points, which I cannot accept.

This code shows the correct ids: ( but I see the inner points)

private void ShowNodes() {
	vtkUnstructuredGridReader reader;
	vtkUnstructuredGrid ugrid;
	vtkVertexGlyphFilter vertexFilter;
	vtkIdFilter idFilter;
	vtkPolyDataMapper ptsMapper;
	vtkLabeledDataMapper lblMapper;
	vtkActor ptsActor;
	vtkActor2D lblActor;

	// read ugrid
	reader = vtkUnstructuredGridReader.New();
	reader.SetFileName(@"c:\vtk\data\cube.1.vtk"); // created by tetgen.exe
(cube with 48 tetrahedrons)
	reader.Update();
	ugrid = reader.GetOutput();

	// filter original point ids
	idFilter = vtkIdFilter.New();
	idFilter.SetInputConnection(ugrid.GetProducerPort());
	idFilter.PointIdsOn();
	idFilter.Update();

	// points
	vertexFilter = vtkVertexGlyphFilter.New();
	vertexFilter.SetInputConnection(ugrid.GetProducerPort());
	vertexFilter.Update();
	ptsMapper = vtkPolyDataMapper.New();
	ptsMapper.SetInputConnection(vertexFilter.GetOutputPort());
	ptsMapper.ScalarVisibilityOn();
	ptsActor = vtkActor.New();
	ptsActor.SetMapper(ptsMapper);
	ptsActor.GetProperty().SetPointSize(10.0f);

	// point labels
	lblMapper = vtkLabeledDataMapper.New();
	lblMapper.SetInputConnection(idFilter.GetOutputPort());
	lblMapper.SetLabelModeToLabelFieldData();
	lblActor = vtkActor2D.New();
	lblActor.SetMapper(lblMapper);

	// render
	renderer.AddActor(ptsActor);
	renderer.AddActor(lblActor);
	renWin.Render();
}

----------------------------------------------------
This code shows totally wrong ids (Differences to code above in bold)

private void ShowSurfaceNodes() {
	vtkUnstructuredGridReader reader;
	vtkUnstructuredGrid ugrid;
	vtkVertexGlyphFilter vertexFilter;
	vtkIdFilter idFilter;
	vtkPolyDataMapper ptsMapper;
	vtkLabeledDataMapper lblMapper;
	vtkActor ptsActor;
	vtkActor2D lblActor;
*	vtkUnstructuredGridGeometryFilter geo;
*
	// read ugrid
	reader = vtkUnstructuredGridReader.New();
	reader.SetFileName(@"c:\vtk\data\cube.1.vtk"); // created by tetgen.exe
(cube with 48 tetrahedrons)
	reader.Update();
	ugrid = reader.GetOutput();

	// filter inner points, so only surface points will be available
*	geo = vtkUnstructuredGridGeometryFilter.New();
	geo.SetInputConnection(ugrid.GetProducerPort());
*
	// filter original point ids
	idFilter = vtkIdFilter.New();
	idFilter.SetInputConnection(*geo.GetOutputPort()*);
	idFilter.PointIdsOn();
	idFilter.Update();

	// points
	vertexFilter = vtkVertexGlyphFilter.New();
	vertexFilter.SetInputConnection(*geo.GetOutputPort()*);
	vertexFilter.Update();
	ptsMapper = vtkPolyDataMapper.New();
	ptsMapper.SetInputConnection(vertexFilter.GetOutputPort());
	ptsMapper.ScalarVisibilityOn();
	ptsActor = vtkActor.New();
	ptsActor.SetMapper(ptsMapper);
	ptsActor.GetProperty().SetPointSize(10.0f);

	// point labels
	lblMapper = vtkLabeledDataMapper.New();
	lblMapper.SetInputConnection(idFilter.GetOutputPort());
	lblMapper.SetLabelModeToLabelFieldData();
	lblActor = vtkActor2D.New();
	lblActor.SetMapper(lblMapper);


	renderer.AddActor(ptsActor);
	renderer.AddActor(lblActor);
	renWin.Render();
}

I hope code is not too long.
Please help. I tried so many things, unfortunately with no success.

with kind regards 
Jochen



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