[Paraview] multiple time steps and particle tracing

[Adam Wiktor]

Hi Ken,

Thanks for figuring that out. Can you think of any way around this bug? The
only reason I needed the temporal shift scale filter was so that the
particle tracer knew the spacing between time steps (by default it's 1 sec,
but it should be 0.0275 sec).

Thanks again,

Adam

On Tue, Aug 18, 2009 at 5:41 PM, Moreland, Kenneth <kmorel at sandia.gov>wrote:

>  I can see the problem with the data set you sent.  I posted a bug report
> for it:
>
> http://www.paraview.org/Bug/view.php?id=9435
>
>
> I’m pretty sure that this bug is caused by a non-feature of ParaView that
> causes the data type of the input of a temporal shift scale (and some other
> temporal filters) to spontaneously convert to temporal data.  John B. is
> supposed to be working on that.  I have no idea what the eta is.
>
> I still think the particle tracer does about what you are looking for.  I’m
> not really the right person to give advice here as I have limited experience
> with the filter (again John B is the expert), but if you only want to inject
> points at the first time step, you should be able to do that by setting the
> “Force Reinjection Every NSteps” parameter to something very large.
>
> -Ken
>
>
> On 8/11/09 2:36 PM, "Adam Wiktor" <awiktor at emory.edu> wrote:
>
> Hi John and Ken,
>
> Paraview seems to read the data fine. If I just load the data and don't
> apply the temporal shift scale, I don't get any error messages as I go
> through the frames. As soon as I apply the temporal shift scale and try to
> change time points, though, I get the error.
>
> I've attached three time points out of the twenty that I'm using (the
> number in the file name is the time in ms). I checked, and paraview still
> gives me the error when only using these three. What I do is open the
> "Velocity-..vti" in paraview. I then click apply, and everything is still
> fine. When I apply the temporal shift scale filter, I don't get a message
> right away, but as soon as I go to the next frame (or any other frame) I get
> the error I mentioned. Do you know what could be wrong?
>
> Also, I'm not completely sure that particletracer is what I'm looking for.
> What I need is something that's basically the same as the streamtracer, but
> that would incorporate the differences in the velocity in each of the time
> points. It would place a seed and integrate like the streamtracer up to the
> next time step, but then use the velocities in the next frame to continue
> the integration. Is that what the particle tracer does? And if so, what do I
> use as the input for port 1?
>
> Thanks for the help,
>
> Adam
>
>
> On Tue, Aug 11, 2009 at 1:43 AM, John Biddiscombe <biddisco at cscs.ch>
> wrote:
>
> Adam
>
> The first error is nothing to do with time, check how you are reading the
> data, something is not right. but I cannot diagnose it from here.
>
>
> Also, back when I wasn't getting this error message, I tried applying the
> ParticleTracer filter, and got the following error message:
>
> ERROR: In
> /home/awiktor/Desktop/ParaView3/VTK/Filtering/vtkDemandDrivenPipeline.cxx,
> line 728 vtkCompositeDataPipeline (0x11e2a10): Input port 1 of algorithm
> vtkTemporalStreamTracer(0x5be0420) has 0 connections but is not optional.
>
> The ParticleTracer requires an input vector field and a seed point input.
> Same as for the Streamtracer, the first error you mentioned is probably
> causing one input to be null (port 0 = vector field, port 1 = seed points).
>
> JB
>
>
>
>    ****      Kenneth Moreland
>     ***      Sandia National Laboratories
> ***********
> *** *** ***  email: kmorel at sandia.gov
> **  ***  **  phone: (505) 844-8919
>     ***      web:   http://www.cs.unm.edu/~kmorel<http://www.cs.unm.edu/%7Ekmorel>
>
>
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