k-Wave

1. Alexll7
   

   Member
   Joined: Jul '18
   Posts: 15

   Hello there !
   I run my simulations with GPU on a cluster. I'm trying to use the option "RecordMovie" but I'm not succeeding in this. In fact I save the input file like that :

   «
   input_args = {...
   'PMLInside', false, 'PMLSize', [PML_X_SIZE, PML_Y_SIZE, PML_Z_SIZE], ...
   'DataCast', DATA_CAST, 'DataRecast', true, 'PlotSim', false, 'RecordMovie', true, 'MovieName', '/data/epione/user/allegay/output/K_wave/film', 'SaveToDisk', '/data/epione/user/allegay/input/K_wave/input_film.h5'};

   sensor_data = kspaceFirstOrder3D(kgrid, medium, transducer, sensor, input_args{:}); »

   and after that I just use « kspaceFirstOrder3D-CUDA_OLD -i input_film.h5 -o output_film.h5 »

   I have no errors and the simulation is OK but I just obtain the output file "output_film.h5" but no movie...? The movie is in the hdf5 file ?
   Or my option "RecordMovie" is not taken into account because it is not saved in the hdf5 file ?
   How could I do this please ?
   Thanks in advance and sorry for my very bad english.

   Alexandre L

   Posted 6 years ago #

2. Jiri Jaros
   

   Developer
   Joined: Feb '12
   Posts: 115

   Hi Alex,
   it is not possible to record movie while using the C++/CUDA code. This would require Matlab and C++ communicating every time step. You have two possibilities:
   (1) run the code in Matlab (if you want to use GPUs in Matlab, recast the data to gpuArray-single).
   (2) parse the output file and create the video yourself. For example, if you want to see the pressure wave in a 2D plane, define a 2D cuboid in sensors. After the simulation, you'll find a group /p in the output file. Here you can find you sensor mask as one of the datasets /1 /2 etc. (depending on how many sensors you use and the order you created them). Finally, the dataset will have a shape of [Nx, Ny, Nz, Nt]. By reading the timesteps one by one, you can generate the video.

   Best,
   Jiri

   Posted 6 years ago #

3. Alexll7
   

   Member
   Joined: Jul '18
   Posts: 15

   Hi Jiri !

   First of all, thanks you very much for your answer !
   Ok for the impossibility of using "RecordMovie" in this case.
   I have precisely chosen the second possibility and I've put a sensor plane just under my transducer. If other people use the same solution, I advise the Matlab app "Slicer" to "read" your sensor's output like a video (you can pass before your eyes thanks the scrollbar).

   Kind regards,
   Alex

   Posted 6 years ago #

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