[vtkusers] ActiViz C# | Problem with vtkPolyDataConnectivityFilter

[Matias Montroull]

never mind, this did the trick:
my polydatanormals still had the "contornos" input. Once I changed to
"removepoints" worked like a charm

    vtkPolyDataConnectivityFilter contornos = new
vtkPolyDataConnectivityFilter();
            contornos.SetInputConnection(skinextractor.GetOutputPort());
            contornos.SetExtractionModeToLargestRegion();
            contornos.SetColorRegions(1);

            vtkCleanPolyData removepoints = new vtkCleanPolyData();
            removepoints.SetInput(contornos.GetOutput());
            removepoints.Update();

            vtkPolyDataNormals skinnormals = vtkPolyDataNormals.New();
            skinnormals.SetInputConnection(removepoints.GetOutputPort());
            skinnormals.SetFeatureAngle(90.0);
            skinnormals.ComputePointNormalsOn();


On Thu, Jan 16, 2014 at 6:52 PM, Matias Montroull <matimontg at gmail.com>wrote:

> I did this and I still get all points that contornos returns :( any idea
> what I'm doing wrong?
>
>       vtkPolyDataConnectivityFilter contornos = new
> vtkPolyDataConnectivityFilter();
>             contornos.SetInputConnection(skinextractor.GetOutputPort());
>             contornos.SetExtractionModeToLargestRegion();
>             contornos.SetColorRegions(1);
>
>             vtkCleanPolyData removepoints = new vtkCleanPolyData();
>             removepoints.SetInput(contornos.GetOutput());
>             removepoints.Update();
>
>
> On Thu, Jan 16, 2014 at 6:46 PM, Matias Montroull <matimontg at gmail.com>wrote:
>
>> Thanks, so to which object I need to apply the vtkCleanPolyData? to my
>> vtkpolydata?
>>
>>
>> On Thu, Jan 16, 2014 at 6:25 PM, David Gobbi <david.gobbi at gmail.com>wrote:
>>
>>> 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);
>>> >                 }
>>> >
>>> >             }
>>>
>>
>>
>
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