[Paraview] Streamtracer filter

[Berk Geveci]

Hi Karla,

Can you be more specific? Maybe post some screenshots and data? That filter
has been quite thoroughly tested on single processor. I also fixed a few
bugs that were in the parallel implementation. Depending on your ParaView
version, you might not have the fixes for the parallel version. I would be
surprised if the integration algorithm itself has a bug. Of course, there
are always numerical accuracy issues and you can compensate by using a
different integrator or adjusting the step-size (the default is Runge-Kutta
2, I believe). Known issues are:

* Premature ending of streamlines in C-grids where the grid folds onto
itself (this may be what you are seeing)
* Premature ending of streamlines in singlular cells

I also need to check a bug report that reads "Streamlines wrong for uniform
rectilinear data... You would expect a streamline to form a circle around
the X axis, but what you get is a streamline that seems to go in completely
the wrong direction. The problem only seems to happen in rectilinear
data.  If you convert to an unstructured grid (with Clean to Grid), the
streamline appears as expected.".  I am guessing it is a bug in the voxel
cell type. I will check this bug and fix it if necessary in next few weeks.

-Berk


On 6/30/06, Karla Vega <vega at tacc.utexas.edu> wrote:
>
>  Hello everyone,
>
> I've been having difficulties with the streamtracer filter. It seems to be
> integrating the velocity field incorrectly and some of my streamlines will
> not continue where they are suppose to do so. I've read through the
> vtkStreamTracer.h file to learn about the different inputs, but it still
> doesn't show the streamlines completely.
> Does anyone know of any known issues with this filter?
>
> Thank you again,
>
> Karla
>
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