Hello, I am continuing my ongoing quest to do something like this http://earth.nullschool.net/#current/wind/isobaric/1000hPa/orthographic=267.73,5.54,350 or this http://www.youtube.com/watch?v=xusdWPuWAoU in Paraview using ***time dependent velocity vectors***.
While the LIC plugin is very cool, it does something different. I followed the previous suggestion and tried to use the streamline filter: http://paraview.org/Wiki/ParaView/Custom_Filters Unfortunately that is not quite right either. The problem with the streamline filter is that it treats each timestep as completely independent and regenerates the streamlines whenever the velocity field changes. (This is the correct behavior: streamlines are defined by the *instantaneous* flow.) What we see in those videos are truly particle trajectories. In particular: - particles are seeded randomly (in space and time) - they leave a decaying trail (sometimes called a streaklet) - the particles disappear after a short lifetime This is the combination of ingredients I need to reproduce in paraview. The best candidate is clearly the ParticleTracer filter. However, I have hit a serious problem: it doesn't appear that this filter is able to make the particles "die" after a temporal lifetime. Compare the v 3.3 documentation http://paraview.org/OnlineHelpCurrent/ParticleTracer.html with the current documentation http://paraview.org/Wiki/ParaView/Users_Guide/List_of_filters#ParticleTracer In the old version, there was an option called "Termination Time" that is missing from the new version. Without such an option, the particles will never disappear, the domain will get more and more crowded, and the computational expense will grow with time. Let me know if you have any suggestions or if you know how to re-enable this Termination Time option. Thanks a lot, Ryan
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