[vtk-developers] Bug in vtk 6.0 - vtkGenericEnSightReader

[Joachim Pouderoux]

The ensight reader create multiblock (composite) data object, if you want
to extract one block from it, just use the vtkMultiBlockDataSet::GetBlock()
function. I can't name a filter (don't think it exists) that would extract
a dataset from a multiblock dataobject - the vtkExtractBlock actually
generates a multiblock even if a single block is selected.

Regarding the geometry, I don't understand what you intend to do: you have
an unstructured (or a set of inside a multiblock) data object and you would
like to transform it to a polydata mesh? What for? The geometry filter
extracts the external boundary surfaces (polygons) of a mesh and generate a
mesh that can be rendered with OpenGL (ie a Polydata) as it is useless (and
too costly) to render all internal faces of the model. Again, the
unstructured grid describes cell types (3d cells, 2d quadratic cells etc.)
that cannot be described in a vtkPolyData dataset.


*Joachim Pouderoux*

*PhD, Technical Expert*
*Kitware SAS <http://www.kitware.fr>*


2015-06-23 10:05 GMT+02:00 madz <madaramh at gmail.com>:

> Thank you for the reply. That seems to be the case. Then how do I get the
> output (all points, not just surface) to a single polydata?
> I cannot call,
>
> vtkSmartPointer<vtkPolyData> polydata = reader->GetOutput();
>
> because that will give a multiblock. I tried the vtkGeometryFilter but it
> doesn't seem to work.
>
>
>
>
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