[Paraview] writing a bunch of polyhedrons

[Hua Yang]

Hi Tomislav,

Are you aware of vtk polyhedron support
(http://www.vtk.org/Wiki/VTK/Polyhedron_Support)? Instead of
manipulating the polydata structure yourself, you can insert the
polyhedrons into an vtkUnstructuredGrid and then save the unstructured
grid using vtkXMLUnstructuredGridWriter. There are some examples in
Graphics/TestPolyhedron0(1).cxx.

Thanks.

Hua

> ---------- Forwarded message ----------
> From: Tomislav Maric <tomislav.maric at gmx.com>
> Date: Wed, Jun 29, 2011 at 5:09 AM
> Subject: [Paraview] writing a bunch of polyhedrons
> To: paraview at paraview.org
>
>
> Hi everyone,
>
> I have a list of polyhedrons which have arbitrary shape, and I would
> like to write them all down
> into a single .vtk file. I am using the POLYDATA data set. Right now,
> my option is:
>
> init global points
> init global faces
>
> for all polyhedra:
>     get local points
>     get local faces
>     add local points to global points
>     map+add local faces to global faces
>
> open the file for writing
> write the .vtk header for POLYDATA
>
> for all points:
>     write the points
>
> for all faces:
>     write the polygons
>
> Is it possible to make this more effective? Right now I am duplicating
> my information when copying/mapping
> to global lists. If I want to write into this file without copying the
> polyhedron data, I will still need
> a memory buffer to store the file from the insertion point on, and it
> would be needed twice for each
> polyhedron:
>
> file::seek up
>
> write the points
>
> file::seek down
>
> write the faces
>
> and at the end, I would need to insert the
>
> POINTS nPoints dataType
>
> and
>
> POLYGONS n size
>
> at apropriate places.
>
> Any advice would be appreciated! :)
>
> Thanks!
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-- 
Hua Yang, Ph. D.
R&D Engineer,
Kitware, Inc.
1-919-969-6990 x 309