[vtkusers] Newbie question about vtkMeshQuality

[Andriy Fedorov]

Thank you! I was looking everywhere but the Tests section :*)



Mathieu Malaterre wrote:

> Andriy,
>
>     Use the documentation of VTK. For example go to the doxygen of the 
> class you wish to use:
>
> http://www.vtk.org/doc/nightly/html/classvtkMeshQuality.html
>
>     Then scroll, you'll find a 'Tests' section, which will lead you to:
>
> http://www.vtk.org/doc/nightly/html/c2_vtk_t_8.html#c2_vtk_t_vtkMeshQuality 
>
>
>     In this case the choice is easy since there is only one test 
> written in c++:
>
> http://public.kitware.com/cgi-bin/viewcvs.cgi/*checkout*/Graphics/Testing/Cxx/MeshQuality.cxx?root=VTK&content-type=text/plain 
>
>
> This gives you an example on how to use this class:
>
> <snip>
>   vtkUnstructuredGridReader* mr = vtkUnstructuredGridReader::New();
>   vtkUnstructuredGrid* ug;
>   vtkMeshQuality* iq = vtkMeshQuality::New();
>
>   mr->SetFileName( fname );
>   mr->Update();
>
>   ug = mr->GetOutput();    // <-- this is the line you need
>   iq->SetInput( ug );
> </snip>
>
>
> HTH
> Mathieu
>
> Andriy Fedorov wrote:
>
>> I know this is something very simple... I am trying to use 
>> itkMeshQuality with a tetrahedral 3D mesh. Here's the code:
>>
>> #include "vtkUnstructuredGrid.h"
>> #include "vtkUnstructuredGridReader.h"
>> #include "vtkMeshQuality.h"
>> #include "vtkDataSet.h"
>> #include <iostream>
>>
>> int main(int argc, char **argv){
>>  if(argc<2)
>>    return -1;
>>
>>  vtkUnstructuredGridReader *vtk_mesh_reader =
>>    vtkUnstructuredGridReader::New();
>>  vtkMeshQuality *mesh_qual = vtkMeshQuality::New();
>>  vtkDataObject *output_mesh;
>>
>>  vtk_mesh_reader->SetFileName(argv[1]);
>>  vtk_mesh_reader->Update();
>>  vtkDataSet *input_mesh = vtkDataSet::SafeDownCast(
>>    vtk_mesh_reader);
>>  mesh_qual->SetInput(input_mesh);
>>  mesh_qual->Update();
>>  output_mesh = mesh_qual->GetOutput();
>>
>>  return 0;
>> }
>>
>> When I run it, I have failure here:
>>
>> ERROR: In 
>> /home/fedorov/SPL/slicer2/Lib/linux-x86/VTK/Common/vtkSource.cxx, 
>> line 384
>> vtkMeshQuality (0x8069318): Required input 0 is not assigned. 
>> Skipping execution.
>>
>> I realize it shuld be possible to figure out from the code, but I 
>> already spent couple of hours w/o success (my VTK experience 
>> approaches 0).  Can somebody give me a quick hint what I am missing? 
>> Thanks a lot!
>>
>> Andriy Fedorov
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>