<div dir="ltr">Hi Ryan,<div>The following thread might be useful in trying to get pathlines/streaklines to work in paraview.</div><div><br></div><div><a href="http://paraview.markmail.org/search/?q=Dan%20Lipsa#query:Dan%20Lipsa+page:1+mid:lr6wjdwan2ixidlg+state:results">http://paraview.markmail.org/search/?q=Dan%20Lipsa#query:Dan%20Lipsa+page:1+mid:lr6wjdwan2ixidlg+state:results</a><br>
</div><div><br></div><div>Dan</div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jan 14, 2014 at 2:20 PM, Ryan Abernathey <span dir="ltr"><<a href="mailto:ryan.abernathey@gmail.com" target="_blank">ryan.abernathey@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hello,<br><br><div>I am continuing my ongoing quest to do something like this</div><div><a href="http://earth.nullschool.net/#current/wind/isobaric/1000hPa/orthographic=267.73,5.54,350" target="_blank">http://earth.nullschool.net/#current/wind/isobaric/1000hPa/orthographic=267.73,5.54,350</a><br>
</div><div>or this</div><div><a href="http://www.youtube.com/watch?v=xusdWPuWAoU" target="_blank">http://www.youtube.com/watch?v=xusdWPuWAoU</a><br></div><div>in Paraview using ***time dependent velocity vectors***.</div>
<div><br></div><div>
While the LIC plugin is very cool, it does something different. I followed the previous suggestion and tried to use the streamline filter:</div><div><a href="http://paraview.org/Wiki/ParaView/Custom_Filters" target="_blank">http://paraview.org/Wiki/ParaView/Custom_Filters</a><br>
</div><div>Unfortunately that is not quite right either.</div><div><br></div><div>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.)</div>
<div><br></div><div>What we see in those videos are truly particle trajectories. In particular:</div><div>- particles are seeded randomly (in space and time)</div><div>- they leave a decaying trail (sometimes called a streaklet)</div>
<div>- the particles disappear after a short lifetime</div><div>This is the combination of ingredients I need to reproduce in paraview.</div><div><br></div><div>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</div>
<div><a href="http://paraview.org/OnlineHelpCurrent/ParticleTracer.html" target="_blank">http://paraview.org/OnlineHelpCurrent/ParticleTracer.html</a><br></div><div>with the current documentation</div><div><a href="http://paraview.org/Wiki/ParaView/Users_Guide/List_of_filters#ParticleTracer" target="_blank">http://paraview.org/Wiki/ParaView/Users_Guide/List_of_filters#ParticleTracer</a><br>
</div><div>In the old version, there was an option called "Termination Time" that is missing from the new version.</div><div><br></div><div>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.</div>
<div><br></div><div>Let me know if you have any suggestions or if you know how to re-enable this Termination Time option.</div><div><br></div><div>Thanks a lot,</div><div>Ryan</div></div>
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