visit-tp-compare

Get the repo

git clone https://github.com/l3-hpc/visit-tp-compare.git
cd visit-tp-compare

Get the sample data, untar.

wget https://renc.osn.xsede.org/ees210015-bucket01/outputs_shiny-le.tar
tar -xvf outputs_shiny-le.tar

Basic loop

This is meant to be really easy to read: just uncomment and comment out stuff, then do

visit -cli -nowin -s movie_loop.py

Then modify ffmpeg.sh and do source ffmpeg.sh, or just modify and paste the command:

ffmpeg -framerate 15 -i TP_nosinkout_layer1_%04d.png TP_nosinkout_layer1.mp4

That ffmpeg command should work everywhere, but it doesn't encode properly for many movie applications. (They do open in Google Chrome, so the enclosed index.html should display them.)

Then move or remove pngs.

rm *.png

Script loop

The file movie_loop_script.py takes command line arguments to make the plot. It assumes the file structure of the shiny outputs. (You can change it.)

The following will make one movie:

visit -cli -nowin -s movie_loop_script.py which_db which_plot do_rm istates

which_db defines the FVCOM file and the corresponding timestamp.

• 0 = no sink out
• 1 = sink out
• 2 = leem (TP=sum of TP terms)

which_plot determines which session file to use

• layer1 = top view, first layer
• layer19 = top view, last layer
• 3D = 3D side view
• 3Dslice = 3D with three-slice operator

Set do_rm = rm if you want to delete the intermediate pngs. (It will not delete them if it is anything else.)

istates is the number of frames (minus one, because Python does that). If istates=0, it will make an image for every timestep.

For example, this makes a movie of TP for all timesteps, with no sinking out, top view of first layer, removes the intermediate pngs.

visit -cli -nowin -s movie_loop_script.py 0 layer1 rm 0

The command line argument version allows you to make a script by pasting commands in a file. (You can use ser2par or launch to parallelize it.)

This does all of the things:

source all_movies.sh

Do a test first, with just 5 frames:

source short_movies.sh

The problem with the above is that there is no error checking, and if VisIt breaks on a step, it will not move to the next command. Just test it with small number of istates before running a big job.

test ffmpeg

It seems atmos and Windows cannot use my ffmpeg command. You can remove pieces of it,(remove command line options), until it works. If you remove too many options, some applications like QuickTime cannot open it. If all fails, or for simplicity, you can change it to the ffmpeg command above and look at it in Google Chrome.

Looking at the data

If the movies files are written to the working directory, you should be able to open index.html in your browser and see the movies.

Here are my movies, hosted on OSN:

• TP compare