[vtk-developers] How to "see" labels ("names") of points of a vtkUnstructuredGrid in a VTK window ?

[houssen]

How to "see" labels (= "names") of points of a vtkUnstructuredGrid in a 
VTK window ?

Is there an existing filter for that ? (looked for it but didn't find 
it)
Should I use vtkLabeledDataMapper: if yes, how ?
Must I write myself a dedicated filter for that ?

I have a valid vtkUnstructuredGrid (named "grid" in the following code 
snippets - points and cells have been set without problems).

Now I add a string array to points (from a list called iVertexNames):
vtkSmartPointer<vtkStringArray> ptNames = 
vtkSmartPointer<vtkStringArray>::New();
ptNames->SetName("names");
for (unsigned int idx = 0; idx < iVertexNames.size(); idx++) 
ptNames->SetValue(idx, iVertexNames[idx]);
grid->GetPointData()->AddArray(ptNames);

I have a VTK window in which I render the grid (works OK): now, I want 
to add point labels to the scene (does not work).

I tried several things that didn't work:
1. grid->GetPointData()->SetActiveScalars("names")
    => nothing change in the VTK window.
2. Add an (2D) actor whose mapper is a vtkLabeledDataMapper (+ calling 
SetLabelModeToLabelScalars)
    vtkSmartPointer<vtkLabeledDataMapper> lblMap = 
vtkSmartPointer<vtkLabeledDataMapper>::New();
    lblMap->SetInputData(grid->????()); // Does NOT compile ? What to 
put here ?
    lblMap->SetInputData(grid->GetPointData()->????()); // Does NOT 
compile ? What to put here ?
    => Does not compile (need to use SetInputConnection ? With which 
argument ?)
3. Use an existing filter for that : didn't find it ! 
(vtkVertexGlyphFilter seems to support only int/double/float ?)
    => Does not exist

Is there another way to do that ?

Franck