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

[Bill Lorensen]

When you do the upgrade be sure to look at this:
http://www.vtk.org/Wiki/VTK/VTK_6_Migration_Guide

Bill



On Sat, Nov 30, 2013 at 12:01 PM, pof <jd379252 at gmail.com> wrote:

>  Thanks Bill for the tip anyway.
> The upgrade of my code from 5.10.0 to 6 was on my todo list anyway.
> Pof
>
> Le 30/11/2013 17:51, Bill Lorensen a écrit :
>
> 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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>>
>>
>>  --
>> Unpaid intern in BillsBasement at noware dot com
>>
>>
>>
>>
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>>
>
>
> --
> Unpaid intern in BillsBasement at noware dot com
>
>
>
>
> ------------------------------
>    <http://www.avast.com/>
>
> Ce courrier électronique ne contient aucun virus ou logiciel malveillant
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>


-- 
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