[vtkusers] add threshold filter to a volume (mipviwer vtk java)

[amal jerbi]

I would like to add a threshold filter to the example of
http://gdcm.sourceforge.net/html/MIPViewer_8java-example.html I have add
this code but that show now thing!!!

vtkMeshQuality qualityFilter = new vtkMeshQuality();
qualityFilter.SetInputConnection(change.GetOutputPort());
qualityFilter.SetTriangleQualityMeasureToArea();
qualityFilter.Update();
tkDataSet qualityMesh = qualityFilter.GetOutput();
vtkThreshold selectCells = new vtkThreshold();
selectCells.ThresholdByLower(.1);
selectCells.SetInputArrayToProcess(0, 0, 0, "FIELD_ASSOCIATION_CELLS",
"vSCALARS");
selectCells.SetInput(qualityMesh);
selectCells.Update();
vtkUnstructuredGrid ug = selectCells.GetOutput();
mapper.SetInput(ug);

also, when i execute the java code of the mipviewer (without threshold
filter) i got the volume but whith an error :Extension GL_VERSION_1_2 could
not be loaded so, i test the exixtance of the version1.2 like that:

        vtkOpenGLExtensionManager extensions = new vtkOpenGLExtensionManager();
        extensions.SetRenderWindow(renWin);
        int etat = extensions.ExtensionSupported("GL_VERSION_1_2");
        System.out.println("version=" + etat);

i got 1 so the version 1.2 exist on my graphic card!!! any idea to solve
that maily the quality of the display is not good

thanks a lot AMAL.
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