[vtkusers] vtkBooleanOperationPolyDataFilter - final result is not manifold

[Bill Lorensen]

Your input meshes should also be cleaned. Also you could try
vtkLoopBooleanPolyDataFilter.

Here are examples that use each method:

https://lorensen.github.io/VTKExamples/site/Cxx/PolyData/LoopBooleanPolyDataFilter/

https://lorensen.github.io/VTKExamples/site/Cxx/PolyData/BooleanOperationPolyDataFilter/

On Mon, Sep 18, 2017 at 2:16 PM, Maximilian Weiherer
<weiherer.maximilian at gmx.de> wrote:
> Hi Cory,
>
> thank you very much for your reply. I tested the vtkCleanPolyData filter (as it merges duplicate points, and/or removes unused points and/or removes degenerate cells). It still get a mesh that is not manifold. I visualized that with help of Meshlab and attached it. The red cells are not manifold (selected via Meshlab's Filters > Cleaning and Repairing > Select non Manifold Edges).
>
> Thanks again!
>
> Best regards,
> Maximilian
>
> -----Ursprüngliche Nachricht-----
> Von: Cory Quammen [mailto:cory.quammen at kitware.com]
> Gesendet: Montag, 18. September 2017 15:27
> An: Maximilian Weiherer <weiherer.maximilian at gmx.de>
> Cc: vtkusers at vtk.org
> Betreff: Re: [vtkusers] vtkBooleanOperationPolyDataFilter - final result is not manifold
>
> Maximimilan,
>
> Have you tried to use vtkMergePoints after vtkAppendPolyData or vtkBooleanOperationPolyDataFilter? This filter merges duplicate points, which I suspect is the step that you are missing to produce a watertight mesh.
>
> HTH,
> Cory
>
>
> On Mon, Sep 18, 2017 at 5:08 AM, Maximilian Weiherer <weiherer.maximilian at gmx.de> wrote:
>> Hi everyone,
>>
>> I'm struggling with the vtkBooleanOperationPolyDataFilter. First, I'm
>> computing the difference D between two vtkPolyData objects, say A and
>> B (this is D := {A\B}). After that, I want to append the resulting
>> difference D to B, i.e. make the union of these two meshes. Therefore,
>> I'm using the vtkAppendPolyData filter. However, the final result is
>> not manifold (which is necessary in order to print the mesh). I also
>> tried the vtkBooleanOperationPolyDataFilter with the union operation
>> but the problem still remains - the final result is not manifold and
>> therefore not printable. How can I append these two meshes so that
>> these are manifold and thus watertight (and printable)?
>>
>> Any help would be appreciated. Thanks!
>>
>> Best regards
>> Maximilian
>>
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>
>
>
> --
> Cory Quammen
> Staff R&D Engineer
> Kitware, Inc.
>
>
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