[vtkusers] Fwd: vtkDecimatePro not fully working with vtkDouble polydata

[Bill Lorensen]

No, looks like that was in vtk6.


On Sat, Nov 30, 2013 at 11:11 AM, pof <jd379252 at gmail.com> wrote:

>  Hi Bill,
> Thanks, this looks pretty much like what I was looking for.
> My mistake... I should have mentioned that I am using vtk5.10.0, in which
> apparently this method does not exist.
> Is there any equivalent method in vtk5.10.0 ?
> Thanks
> Pof
>
> Le 30/11/2013 14:15, Bill Lorensen a écrit :
>
> You can set the precision of the output points:
>
>  deci->SetOutputPointsPrecision(vtkAlgorithm::DOUBLE_PRECISION);
>
>
>
>  On Sat, Nov 30, 2013 at 5:11 AM, pof <jd379252 at gmail.com> wrote:
>
>>  No answer yet on this question.
>>
>> Just to mention this is a problem for me as I'm working on meshes
>> expressed in geographical coordinates, i.e. sometimes having large values
>> (typically over 1e7) which are unaccurately represented by float variables.
>>
>> Any idea / comment ?
>>
>>
>> -------- Message original --------  Sujet: vtkDecimatePro not fully
>> working with vtkDouble polydata  Date : Wed, 27 Nov 2013 18:58:52 +0100  De :
>> pof <jd379252 at gmail.com> <jd379252 at gmail.com>  Pour : vtkusers at vtk.org
>>
>>
>> Hi vtk'ers,
>>
>> I have a mesh with points defined as vtkDouble:
>>     vtkPoints *MeshPoints = vtkPoints::New(VTK_DOUBLE);
>> and with a regular vtkCellArray:
>>     vtkCellArray *MeshCells = vtkCellArray::New();
>>
>> The mesh is build as usual with:
>>     vtkPolyData *MeshPolyData;
>>     MeshPolyData->SetPoints(MeshPoints);
>>     MeshPolyData->SetPolys(MeshCells);
>>
>> Now I need to perform a mesh decimation of this mesh, and I'm doing
>> nothing special:
>>     vtkDecimatePro *deci = vtkDecimatePro::New();
>>     deci->SetInput(MeshPolyData);
>>     deci->SetTargetReduction(DecimationFactor);
>>     deci->PreserveTopologyOn();
>>     deci->BoundaryVertexDeletionOn();
>>     deci->SetMaximumError(VTK_DOUBLE_MAX);
>>     deci->Update();
>>
>> The problem I am facing is that the resulting decimated mesh is actually
>> based on vtkFloat:
>>     int type = deci->GetOutput()->GetPoints()->GetDataType();
>>
>> i.e. type = 10 (VTK_FLOAT), wheras I would have expected 11 (VTK_DOUBLE)
>> as for the original mesh.
>>
>> I would have though that the data type of the decimated mesh should have
>> been the same as the input mesh, which is not the case.
>> Is this a bug? Or have I missed something?
>>
>> Thanks in advance for your help/advice.
>> Pof
>>
>>
>>
>>
>>
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>
>
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>
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