[vtkusers] Visualizing normal vectors

[Andaharoo]

Your error said an array index went out of bounds. What line? Also I noticed
you never set the source data for the glyph. Could be unrelated to your
current error message, but a problem.

The glyph mapper takes two inputs. The glyph data (positions, normals,
scalars, etc) and the source (thing to copy). So if you want arrows as the
normals do this:

vtkSmartPointer<vtkOpenGLGlyph3DMapper> glyph3D =
vtkSmartPointer<vtkOpenGLGlyph3DMapper>::New(); 
glyph3D ->SetInputData(polydata); 
vtkSmartPointer<vtkArrowSource> glyphSource =
vtkSmartPointer<vtkArrowSource>::New();
glyphSource->Update();
glyph3D->SetSourceData(glyphSource->GetOutput());
glyph3D ->SetOrientationArray("normals"); 
glyph3D ->SetScaleFactor(0.5); 
glyph3D ->Update(); 



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