[vtkusers] create the polydata volume from unstructured grid

[Alex Malyushytskyy]

It is not enough details, so it is not clear what you want to do and where.

I assume you want to do it in your code in VTK since AFAIK Paraview has its
mailing list.
Then you have to remember that stl file is basically a list of triangles.
Questions are:
 - do you need handle only triangles or  other 2d and/or 3d cells.
 - are you satisfied if all your cells are presented by the the set of
separated triangles?

If yes:
If your unstructured grid contains only triangles you could convert it to
polydata then use vtkSTLWriter to write stl file.
if you need to support all 2D cells, you might need to use vtkTriangleFilter
<http://www.vtk.org/doc/release/4.2/html/classvtkTriangleFilter.html>
before vtkSTLWrite.
If you have 3d cells you might need iterate over them and create
appropriate triangles which would describe cell surface.

Regards,
   Alex


On Thu, Apr 4, 2013 at 10:59 AM, Dmitry Tyulin <dmitry.tyulin at gmail.com>wrote:

> Hello there!
> I have a volume in vtk unstructured grid. How can I convert it to CAD file
> format? .stl, for example. In paraview I can run Extract Surface module,
> but it gives to me only a surface. So, how can i convert the whole volume
> to .stl or .ply?
>
> Regards,
> Dmitry.
>
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