[vtkusers] How to quickly shows the vertex id

[Rockydut]

I use the vtkLabeledDataMapper to shows the vertex ids. A simple code as
following:

VTK_CREATE(vtkLabeledDataMapper, labelMapper);
labelMapper->SetInputData(poly);
labelMapper->GetLabelTextProperty()->SetColor(m_txRGB);
labelMapper->GetLabelTextProperty()->SetFontSize(m_txSize);

However, if there are many vertex ids need to be show in text form, it is
very slow.
How to quickly shows the vertex ids if there are millions of vertexs.

Furthermore, if the coordinates and ids are stored in a vector, such as:
struct {double x, double y, double z}Coord;
vector<vtkIdType> vecID;
vector<Coord> vecCoor;
How to show the vecID in the window?



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