[vtkusers] vtkBooleanOperationPolyDataFilter - final result is not manifold

[Maximilian Weiherer]

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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