[vtkusers] vtkStreamTracer not connecting through boundaries

[da]

Hey Berk,

I am not using the development version. I will try that next (what is the
development version? Is this a CMAKE flag when compiling VTK?). I have
tested my file with Paraview's streamtracer (using the same integration
units, and even smaller integration units), and it does not have this
problem regardless of what integration unit I use. Is this because Paraview
applies a filter before stream tracer? (I noticed it took a much longer time
to do it in Paraview).

Here is the latest thing I've tried: I was thinking that it had to do with
the tolerance (const double vtkInterpolatedVelocityField::TOLERANCE_SCALE =
1.0E-8; ) when calling FindCell(), so I implemented a subclass of
vtkInterpolatedVelocityField that used a tolerance of 1E-03 which didn't
change a thing - so it seems to be a problem with vtkPointSet's FindCell
method?

I'll let you know if the development version improves things.

Thanks,
Da

On Thu, Feb 11, 2010 at 3:01 PM, Berk Geveci <berk.geveci at kitware.com>wrote:

> This is a known issue for which we now have a solution (crossing fingers).
> Are you using the development version of VTK? If yes, try calling
> SetInterpolatorType(vtkStreamTracer::INTERPOLATOR_WITH_CELL_LOCATOR)
>
> Please let me know whether this works or not.
>
> Best,
> -berk
>
> On Thu, Feb 11, 2010 at 3:33 PM, da <remywendy at gmail.com> wrote:
>
>> Hey guys,
>>
>> I have a single structured grid that is split in the middle (see picture).
>> When I try to run a vtkStreamTracer through it, the stream lines will be cut
>> off at this boundary if the Integration Unit is set too fine. However, if I
>> make the integration unit big enough so that the line goes through okay, I
>> lose too much resolution elsewhere. I tried using a vtkConnectivityFilter
>> before the stream tracer, but it didn't seem to connect the cells on the
>> boundary. Any ideas?
>>
>> -Da
>>
>>
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