Opensim and Matlab

[Arash Mohammadzadeh Gonabadi]

Hello all,

I have a question about OpenSim through Matlab.
How can we display and play the final model with its motion through Matlab to see the animation? I couldn't find the command in Matlab.
Thanks.

Best,
Arash

[Ana de Sousa]

Hello Arash,

I do not know if Matlab opens OpenSim and starts the animation. What I do is the following:

1) I create an .sto file for visualization
2) I open the OpenSim GUI
3) I open the model and load the .sto

My code for creating the visualization file:

Nsamples = length(motionData.data(:,1)); Nstates = length(statesNames); %motionData is the return from "IntegrateOpenSimPlant" function

str = strjoin(statesNames,'\t'); %variable with the names of the states
header = ['gait_simulation \nversion=1 \nnRows=' num2str(Nsamples) ' \nnColumns=' num2str(Nstates+1) '\ninDegrees=no \nendheader \ntime ' str '\n']; % create the header of the .sto file
fid = fopen('Results/gait_simulation.sto','wt'); %open the file
fprintf(fid,header); fclose(fid); % print the header
fid = fopen('Results/gait_simulation.sto','a+');
for i = 1:Nsamples
fprintf(fid,'\t%f',motionData.data(i,:)); fprintf(fid,'\n'); % print the states
end
fclose(fid); %close the file

That is working fine for me, I hope it helps.

[Christopher Dembia]

You can also use the Simbody Visualizer through Matlab. Use "model.setUseVisualizer(true)" right after constructing your model. If you are using 4.0, you can see the following example, which uses the visualizer for a forward simulation: https://github.com/opensim-org/opensim- ... isualize.m

[Arash Mohammadzadeh Gonabadi]

Hello,

Thank you so much for your help. I tested "model.setUseVisualizer(true)" previously, but unfortunately it did not work, and I was wondering what is my mistake.
Would it be possible to take a look at the following file and run it with Matlab?

Gait2392_Simbody_Matlab_Arash.rar

(445.72 KiB) Downloaded 9 times

Thank you so much.

best,
Arash