[Paraview] Calculator speed

[Berk Geveci]

The array calculator does not use Python but it is slow nevertheless.
Actually, this could be done much faster using Python/NumPy. This is
currently possible but hard to do (complicated API). We are working on
an easier-to-use interface.  If you are adventurous, I can give you
some pointers. Otherwise, C++ custom filter is the way to go.

-berk

On Tue, Sep 9, 2008 at 8:58 AM, Tobias Brandvik <tbrandvik at gmail.com> wrote:
> Hi,
>
> I've written a CFD solver that uses Paraview in parallel mode with
> hdf5/xdmf. Currently, the application writes out the primary variables
> and lets the user calculate any desired secondary variables using the
> calculator. However, this procedure is very slow -- it seems to be an
> order of magnitude faster to calculate the data in the solver itself
> and have Paraview read it from disk. I suspect this is because the
> calculator expressions get translated to python code, but I might also
> be doing something wrong.
>
> Am I correct in thinking that the easiest way to fix this would be to
> write a custom filter in C++?
>
> Cheers,
> Tobias
>
> --
> Tobias Brandvik
> PhD Student
> Whittle Laboratory
> 1 JJ Thomson Avenue
> Cambridge CB3 0DY, UK
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