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<TITLE>Re: [Paraview] multiple time steps and particle tracing</TITLE>
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<FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>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.<BR>
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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.<BR>
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-Ken<BR>
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On 8/10/09 10:17 AM, "Adam Wiktor" <<a href="awiktor@emory.edu">awiktor@emory.edu</a>> wrote:<BR>
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</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Hi,<BR>
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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.<BR>
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I'm having two problems: first of all, when I apply the temporalshiftscale, I get the following error message:<BR>
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ERROR: In /home/awiktor/Desktop/ParaView3/VTK/Filtering/vtkStreamingDemandDrivenPipeline.cxx, line 747<BR>
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vtkCompositeDataPipeline (0x153c960): No maximum number of pieces has been set in the information for output port 0 on algorithm vtkFileSeriesReader(0x1537e70).<BR>
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I wasn't getting this error before when I was doing the same thing on the same data set, but something must have changed. <BR>
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Also, back when I wasn't getting this error message, I tried applying the ParticleTracer filter, and got the following error message:<BR>
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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.<BR>
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Does anyone know what these errors mean, and how to fix them?<BR>
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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?<BR>
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Thanks,<BR>
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Adam<BR>
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**** Kenneth Moreland<BR>
*** Sandia National Laboratories<BR>
*********** <BR>
*** *** *** email: <a href="kmorel@sandia.gov">kmorel@sandia.gov</a><BR>
** *** ** phone: (505) 844-8919<BR>
*** web: <a href="http://www.cs.unm.edu/~kmorel">http://www.cs.unm.edu/~kmorel</a><BR>
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