[Paraview] multiple time steps and particle tracing

[Moreland, Kenneth]

I cannot replicate the first issue you are having with the temporal shift scale.  Perhaps it would help if you could post some example data.

John Biddiscombe would be better at answering questions about the particle tracer, but I believe your problem is that you have not connected a "source" input.  The particle tracer requires two inputs.  The first input (port 0) contains the mesh with the vector field data.  The second input (port 1, called the source) is a mesh used to inject particles.  At each time step, a particle located at each point in the source mesh will be injected into the particle tracer.

-Ken


On 8/10/09 10:17 AM, "Adam Wiktor" <awiktor at emory.edu> wrote:

Hi,

I am trying to visualize blood flow through the aorta from MRI scans. I have a series of .vti images with the velocity, each one a single time step. I opened them in paraview as a composite data set, and paraview seems to have loaded each time step correctly. I now need to use a temporalshiftscale to set the correct time for each step, and then use a particle trace to visualize the blood flow.

I'm having two problems: first of all, when I apply the temporalshiftscale, I get the following error message:


ERROR: In /home/awiktor/Desktop/ParaView3/VTK/Filtering/vtkStreamingDemandDrivenPipeline.cxx, line 747

vtkCompositeDataPipeline (0x153c960): No maximum number of pieces has been set in the information for output port 0 on algorithm vtkFileSeriesReader(0x1537e70).

I wasn't getting this error before when I was doing the same thing on the same data set, but something must have changed.

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.

Does anyone know what these errors mean, and how to fix them?

Finally, I assume that the difference between stream tracer and particle tracer is that stream tracer operates on a single time step, whereas particle tracer incorporates multiple time steps. Is that true? And if that is the case, what does particle pathlines do?

Thanks,

Adam



   ****      Kenneth Moreland
    ***      Sandia National Laboratories
***********
*** *** ***  email: kmorel at sandia.gov
**  ***  **  phone: (505) 844-8919
    ***      web:   http://www.cs.unm.edu/~kmorel

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