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,
Hi Ryan,
When I look at these movies carefully, it looks like they are using
streaklines that are seeded for a short burst. It looks like they pick
a number of seeds each time step and start a streakline from each and
keep them active for a few time steps. Then those streaklines seem to
be
Hi Ryan,
The following thread might be useful in trying to get pathlines/streaklines
to work in paraview.
http://paraview.markmail.org/search/?q=Dan%20Lipsa#query:Dan%20Lipsa+page:1+mid:lr6wjdwan2ixidlg+state:results
Dan
On Tue, Jan 14, 2014 at 2:20 PM, Ryan Abernathey
Berk,
That might be the correct interpretation for the first video, which I think
uses a steady (i.e. not time-dependent) flow field. For steady flows,
streamlines, streaklines, and trajectories are all identical.
But if you look at the second video, I think you can see that they are
plotting
I got it. I think that the correct way of doing this would be:
1. Seed particles
2. Integrate 1 time step
3. Kill particles that are older that threshold
4. Connect particles to generate streaklets
5. If time step % n == 0, update seed source randomly
6. Go to 1 if time step left
Does this make
Yes, that sounds very sensible!
Of course, the difficult part (for me, a relative noob) is to actually
implement those steps in terms of a Paraview pipeline. Or would you
recommend creating a new custom filter?
Unfortunately experimentation has been difficult because of the slowness /
Hi Ryan,
(4) and (5) won't work out of box and need some thinking. (3) can be
implemented by applying Threshold after the particle tracer.
I am not aware of any particular issues - other than general slowness
but not as bad as you describe - with the particle tracer. Do you have
some data that I
Note that if you jump around in time, the particle filter can be very
slow specially with time dependent data. It has to regenerate the
particle paths for all of the times in between if you do that, which
means loading a lot of data from disk. It should be relatively fast
when animating forward
