[vtk-developers] Polyhedral challenge

[Will Schroeder]

Of course you can have access. My repository is on github as wschroed/VTK.
Hua has one too, we occasionally pull and push from each others repository.
If you need help accessing the the code ask the developers on this mailing
list (since I am on vacation this week and don't yet know git that well).

Will

On Tue, Mar 2, 2010 at 2:29 PM, Fabian, Nathan <ndfabia at sandia.gov> wrote:

>  Hi Will,
>
> Can I get access to that repository?   I misread this thinking it was
> already going into cvs... I am currently trying to get the latest exodus API
> in which handles polyhedra.  I’d be happy to help test from my end (although
> I’d be happy just to read and write for now...)
>
> Thanks,
> Nathan.
>
>
> On 2/18/10 9:38 AM, "Will Schroeder" <will.schroeder at kitware.com> wrote:
>
> Hua and I have made progress on adding a vtkPolyhedron cell to VTK. We have
> a wiki page describing the tasks (which will take some time
> to implement depending on our funding and schedule
> http://www.vtk.org/Wiki/VTK/Polyhedron_Support). We are using the
> interpolation method of mean value coordinates which Hua has already
> implemented, thus far it is a super algorithm. Comments are welcome.
>
> We are now starting the integration into vtkUnstructuredGrid. If you are
> interested let me know and at the appropriate point we can make our git
> repository available.
>
>
>
> On Thu, Jan 21, 2010 at 6:53 AM, Will Schroeder <
> will.schroeder at kitware.com> wrote:
>
> FYI-
>
> Hua Yang and I are adding a new cell type to VTK: the polyhedral cell. This
> is mainly to support our CFD friends who like to compute flow solutions
> using flux approaches (balance mass and energy in and out of a region).
>
> One of the key questions is how to interpolate across the interior of such
> a cell. In the past I have seen two typical approaches 1) tessellate the
> polyhedron into tetrahedra, and then use the tetrahedra to interpolate; and
> 2) use a 1/r**2 (or similar weighting function) to interpolate from the cell
> nodes to an interior point in the polyhedron. Both approaches have problems
> with continuity, etc.
>
> We are also researching other approaches. However in the interest of
> completeness, if anybody has suggestions for alternatives we'd love to hear
> about them.
>
> Will
>
>
>
>


-- 
William J. Schroeder, PhD
Kitware, Inc.
28 Corporate Drive
Clifton Park, NY 12065
will.schroeder at kitware.com
http://www.kitware.com
(518) 881-4902
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