[vtkusers] Filter to remove internal structure of a poly data?

[Kilgus, Thomas]

Ok, thank you very much!

Von: David E DeMarle [mailto:dave.demarle at kitware.com]
Gesendet: Dienstag, 14. Juli 2015 16:07
An: Kilgus, Thomas
Cc: vtkusers at vtk.org
Betreff: Re: [vtkusers] Filter to remove internal structure of a poly data?

So what it is doing is passing the locally 2D primitives through, which is not what you want it to do. If this was a volumetric mesh it would give you the skin. You want something like vtkSelectEnclosedPoints.

Unfortunately vtkSelectEnclosedPoints requires a surface to clip by, and that surface is exactly what you are trying to get. There might be something in VTK for this, but my quick searches haven't found it.

sorry




David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909<tel:518-881-4909>

On Tue, Jul 14, 2015 at 8:39 AM, Kilgus, Thomas <t.kilgus at dkfz-heidelberg.de<mailto:t.kilgus at dkfz-heidelberg.de>> wrote:
No no, my data is 3D. The screenshot just contains cross sections to illustrate how the data looks “inside”.

Von: David E DeMarle [mailto:dave.demarle at kitware.com<mailto:dave.demarle at kitware.com>]
Gesendet: Dienstag, 14. Juli 2015 14:35

An: Kilgus, Thomas
Cc: vtkusers at vtk.org<mailto:vtkusers at vtk.org>
Betreff: Re: [vtkusers] Filter to remove internal structure of a poly data?

Ah, I thought your data was 3D, not 2D. The DSSF won't help in this case.


David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909<tel:518-881-4909>

On Tue, Jul 14, 2015 at 8:26 AM, Kilgus, Thomas <t.kilgus at dkfz-heidelberg.de<mailto:t.kilgus at dkfz-heidelberg.de>> wrote:
Hi David,

sounds great, but it doesn’t do anything on my data. Do you know how the filter works? Attached is my code and a screenshot how my data looks like. Any ideas?

Regards,
Thomas

Code:

  std::string inputFilename = “path/to/file”;
  std::string outputFilename = “path/to/save”;
  vtkSmartPointer<vtkXMLPolyDataReader> reader =
      vtkSmartPointer<vtkXMLPolyDataReader>::New();
  reader->SetFileName ( inputFilename.c_str() );
  reader->Update();

  vtkSmartPointer<vtkDataSetSurfaceFilter> filter = vtkSmartPointer<vtkDataSetSurfaceFilter>::New();
  filter->SetInputConnection(reader->GetOutputPort());
  filter->Update();

  vtkSmartPointer<vtkXMLPolyDataWriter> writer = vtkSmartPointer<vtkXMLPolyDataWriter>::New();
  writer->SetInputConnection(filter->GetOutputPort());
  writer->SetFileName(outputFilename.c_str());
  writer->Update();
  writer->Write();

Von: David E DeMarle [mailto:dave.demarle at kitware.com<mailto:dave.demarle at kitware.com>]
Gesendet: Dienstag, 14. Juli 2015 13:37
An: Kilgus, Thomas
Cc: vtkusers at vtk.org<mailto:vtkusers at vtk.org>
Betreff: Re: [vtkusers] Filter to remove internal structure of a poly data?

Try vtkDataSetSurfaceFilter. It produces the external skin of any dataset in the form of a polydata.


David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909<tel:518-881-4909>

On Tue, Jul 14, 2015 at 5:00 AM, Kilgus, Thomas <t.kilgus at dkfz-heidelberg.de<mailto:t.kilgus at dkfz-heidelberg.de>> wrote:
Hi everyone,

I am not sure how to call this, but I was wondering if there is any filter (or combination) to remove internal structures of a PolyData? By internal I mean stuff that is not visible to the camera, unless you make the surface translucent. I know that there is a vtkPolyDataConnectivityFilter which works for some uses cases, but my data is connected at some parts. I am not even sure if this is possible, but the virtual camera could rotate around the object and every cell which is not seen (hit by a ray) could be deleted. Is there anything like this in VTK?

Regards,
Thomas

Thomas Kilgus
German Cancer Research Center (DKFZ)
Div. Medical and Biological Informatics
Junior group: Computer-assisted Interventions (E131)
Im Neuenheimer Feld 280
69120 Heidelberg, Germany
Phone: +49(0) 6221-42-3545<tel:%2B49%280%29%206221-42-3545>


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