[vtkusers] vtkDecimatePro question

[Alexander Trum]

Hello

Before using vtkDecimatePro you can pass your mesh through
vtkCleanPolyData with a tolerance of 0.0.
Perhaps this can solve your problem but I'm not sure.

Bye,
  Alex

Brian Webb schrieb:
> 
> I'm trying to use vtkDecimatePro to decimate a model, and it appears to be
> just removing facets and leaving holes in the model.  According to the
> documentation it appears that calling PreserveTopologyOn should prevent this
> from happening.  This works with a standard (fran) model, but it doesn't on
> my models.
> 
> I'm thinking that there's something inconsistent in my models (the normals
> are inconsistent, or the polygons are not ordered correctly), but I can't
> figure out a way to correct it.  I tried vtkPolyDataNormals, but that didn't
> work.
> 
> Any ideas on what else I could try would be appreciated.  I've included the
> relevant parts of my script at the end of this email.
> 
> Thanks,
> 
> Brian Webb
> 
> #
> # Read the model.
> #
> vtkOBJReader importer
>   importer SetFileName mig27.obj
> #vtkPolyDataReader importer
> #  importer SetFileName "$VTK_DATA_ROOT/Data/fran_cut.vtk"
> 
> vtkTriangleFilter triangs
>   triangs SetInput [importer GetOutput]
> 
> vtkPolyDataNormals normals
>   normals SetInput [triangs GetOutput]
>   normals FlipNormalsOn
>   normals SplittingOff
>   normals ConsistencyOn
>   normals ComputePointNormalsOn
>   normals ComputeCellNormalsOn
> 
> vtkDecimatePro mesh
>   mesh SetInput [triangs GetOutput]
>   mesh SetTargetReduction 0.7
>   mesh PreserveTopologyOn
>   mesh AccumulateErrorOn
>   mesh SplittingOff
>   mesh DebugOn
> 
> #
> # Create the mapper.
> #
> vtkPolyDataMapper mapper
> mapper SetInput [mesh GetOutput]
> 
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