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

[pof]

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 
> <mailto: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> <mailto:jd379252 at gmail.com>
>     Pour : 	vtkusers at vtk.org <mailto: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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