a) Use: h5ls MYFILE.h5 b) This depends on your geometry settings, but you may repeat exporting different slices from HDF, as well as you may put multiple meep.fields.output_hdf5() functions in the time stepping cycle. Once I would like to write a little howto on this topic... Filip
P. S. Note that the HDF slices may use time as one axis, providing interesting time-unrolled images. See http://fzu.cz/~dominecf/misc/meep/ 2012/8/31, Chiraag Nataraj <chir...@caltech.edu>: > Thanks Filip! How do I figure out > > a) how many time slices there are and > > b) which x (or y or z) slice to choose? > > Thanks in advance! > > - Chiraag > >> The possibly simplest and least effective approach is to store whole >> 3+1D data from the simulation to a HDF5 file. One has to be careful >> that the file may grow really big (gigabytes...). >> >> After running the simulation, one can export the animated data using >> the e. g. similar commands (on Linux with Imagemagick installed): >> >> rm *png >> h5topng -x 13 -t 0:359 -R -Zc dkbluered -a yarg MYFILE.h5 >> convert -delay 2 *png slice_x13.gif >> >> In this case, the command specifies the 13th slice of X, producing Y-Z >> slices. With time going through all 360 slices, we create 360 >> consecutive PNG images and the last command creates an animated GIF >> file. >> >> Note that with this approach the file size grows with fourth power of >> resolution! For higher resolutions it is advisable to save only the >> slices we want, specifying a 2D volume in the meep time stepping >> routine. I am using Python-MEEP, but scheme version should be similar: >> >> (...) >> ex_YZ_file = prepareHDF5File("ex_YZ.h5") >> while (f.time() < (f.last_source_time()*2): >> f.step() >> f.output_hdf5(Ex, >> volume(vec(size_x/2, 0., 0.), vec(size_x/2, size_y, >> size_z)), >> ex_YZ_file, 1) >> >> Best regards, >> Filip >> >> 2012/8/31, Chiraag Nataraj <chir...@caltech.edu>: >>> Hey guys! >>> >>> I'm trying to figure out exactly how 3D stuff works with respect to the >>> post-processing. Yeah, MEEP does the 3D simulation and all, but where >>> do >>> you go from there? I'm not exactly sure how you're supposed to use the >>> data given by MEEP. >>> >>> Thanks in advance! >>> >>> Sincerely, >>> >>> Chiraag >>> >>>> Hey guys! >>>> >>>> Sorry for spamming the list, but as I was playing around just now, I >>>> also >>>> couldn't understand exactly how the slices work when you render a 3D >>>> object in MEEP. MEEP is fine with it, parses it, and comes up with the >>>> H5 >>>> files. However, I'm trying to figure out exactly how the slices work. >>>> >>>> Any help would be appreciated. >>>> >>>> Thanks in advance! >>>> >>>> - Chiraag >>>> >>>> >>>> _______________________________________________ >>>> meep-discuss mailing list >>>> meep-discuss@ab-initio.mit.edu >>>> http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss >>>> >>> >>> >>> >>> _______________________________________________ >>> meep-discuss mailing list >>> meep-discuss@ab-initio.mit.edu >>> http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss >>> >> > > > _______________________________________________ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
