[vtkusers] ActiViz C# | Problem with vtkPolyDataConnectivityFilter

[David Gobbi]

The vtkPolyDataConnectivityFilter probably only removes cells,
not points.  Pass your data through vtkCleanPolyData after the
connectivity filter to get rid of any extra points.

On Thu, Jan 16, 2014 at 2:19 PM, Matias Montroull <matimontg at gmail.com> wrote:
> Hi,
>
> I have a problem trying to obtain the inner points of a 3D reconstruction. I
> can visualize just fine but when I save the points and then re open to see
> them, I still see the image as when it was without the DataConnectivity
> Filter. Why that may be? SkinNormals gets the output of the filter..
>
> here's the code:
>
>  vtkContourFilter skinextractor = vtkContourFilter.New();
>             skinextractor.SetInputConnection(readerdicom.GetOutputPort());
>             skinextractor.GetValues();
>             skinextractor.SetValue(0, -800);
>
>             vtkPolyDataConnectivityFilter contornos = new
> vtkPolyDataConnectivityFilter();
>             contornos.SetInputConnection(skinextractor.GetOutputPort());
>             contornos.SetExtractionModeToLargestRegion();
>             contornos.Update();
>             contornos.SetColorRegions(1);
>
>
>             vtkPolyDataNormals skinnormals = vtkPolyDataNormals.New();
>             //skinnormals.SetInputConnection(skinextractor.GetOutputPort());
>             skinnormals.SetInputConnection(contornos.GetOutputPort());
>             skinnormals.SetFeatureAngle(90.0);
>             skinnormals.ComputePointNormalsOn();
>
>             vtkPolyData polys = new vtkPolyData();
>             polys = skinnormals.GetOutput();
>             polys.Update();
>             polys.BuildCells();
>             int numberofpoints = polys.GetNumberOfPoints();
>
>             for (int i = 0; i < polys.GetNumberOfPoints(); i ++)
>             {
>                 double[] p = new double[3];
>                 p = polys.GetPoint(i);
>                 POI poi_mesh_individual = new POI();
>                 poi_mesh_individual.POI_x = Convert.ToDecimal(p[0]);
>                 poi_mesh_individual.POI_y = Convert.ToDecimal(p[1]);
>                 poi_mesh_individual.POI_z = Convert.ToDecimal(p[2]);
>                 POIs_3D.Add(poi_mesh_individual);
>             }
>
>             using (StreamWriter writer = new StreamWriter(@"C:/tracker/" +
> "mesh.poi", false))  // False to overwrite the file; True to append data to
> the file;
>             {
>                 for (int i = 0; i < POIs_3D.Count; i++)
>                 {
>                     writer.WriteLine(POIs_3D[i].POI_x + ";" +
> POIs_3D[i].POI_y + ";" + POIs_3D[i].POI_z);
>                 }
>
>             }