[vtkusers] Contours at boundary of a rectilinear grid

[Steve Joyce]

Hi,

I am using vtkContourFilter to plot isosurfaces on a
vtkRectilinearGrid.
My scalar data is cell based, so I am converting it to point data
first.
The contours appear OK, except where they are exactly on the boundary
of the grid, where they are not visible. Is there any way to make
contours on the boundary visible?

Thanks,
Steve

I am using VTK 4.2.3 with Java 1.4.2_01 on Windows XP.
The relevant section of code is:

            
            // Convert cell scalar values to point values
            vtkCellDataToPointData pointFilter = new
vtkCellDataToPointData();
            pointFilter.SetInput(grid);
            pointFilter.PassCellDataOn();
            
            // Create contours for isosurfaces
            vtkContourFilter contours = new vtkContourFilter();
            contours.SetInput(pointFilter.GetOutput());
            for (int i = 0; i < values.length; ++i) {
                contours.SetValue(i, values[i]);
            }
            
            // Create a mapper for the isosurfaces
            vtkPolyDataMapper mapper = new vtkPolyDataMapper();
            mapper.SetInput(contours.GetOutput());
            mapper.ScalarVisibilityOn();
            
            // Create an actor for the isosurfaces
            vtkLODActor actor = new vtkLODActor();
            actor.GetProperty().SetRepresentationToSurface();
            actor.SetMapper(mapper);
            
            // Add the actor
            renderer.AddProp(actor);





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