Knee translations are a prescribed as a function of knee flexion angle. This function basically shifts the knee down 40 cm (the length of the femur bone). There is an underlying reference buried somewhere in the opensim literature. <TransformAxis name="translation2"> <!--Names of the coordinates tha...

i'd recommend running these tools by calling their commands thru the command line... [success,output] = dos(['analyze -S ',xmlpath]); this seems to run faster and the screen output is suppressed to variable output - which is convinient because a single fprintf(fid,output) writes the output cleanly t...

If you are using the default muscle and slack length parameters, this 'jerky' muscle loading may come from noisy kinematics. were these kinematics adequately filtered?

Two ideas off the top of my head... you can modify the joint(1) or modify the bodies(2)... depending on how you want the knee joint to function. modify the joint: 1. A second degree of freedom could be added to the knee joint (frontal plane) - and the resulting gencoord could either be prescribed (o...

thanks adrian. % get muscle thisMuscle = model.getMuscles.get(musclename); thisMuscleSafe = Millard2012EquilibriumMuscle.safeDownCast(thisMuscle); % access tendon properiets and edit tendonprop = thisMuscleSafe.get_TendonForceLengthCurve(); strainatnorm = tendonprop.get_strain_at_one_norm_force(); t...

Is it possible to query and set the TendonForceLengthCurve properties thru MATLAB? Particularly strain_at_one_norm_force using osim 3.3?

thanks - josh

many of the default opensim models have ranges of 90 degrees set for the pelvis orientation coordinates. If you go into the osim file and change these ranges to <range>-3.14159 3.14159</range> the problem of lining up the subject with the lab coordinate system should be resolved.

I have a simulation that successfully implements an elastic foundation contact object. Now I am interested in identifying the faces of both triangular meshes (made from STL files) that are penetrating their neighboring body. It looks like this calculation is performed during the contact simulation i...