Fabien, I'm not sure what is missing? I checked and the following works from the scripting page: creates a new marker set when one does not exist, adds a marker, them overwrites it: myModel=modeling.Model("tug_of_war.osim") gndBody=myModel.getBodySet().get("ground") newMarkerSet=modeling.MarkerSet()...

Fabien, I run into this problem periodically and I believe it has something to do with you overwriting a already instantiated reference. I can't remember how I get around that, but I do know there are some nice example code on how to create marker sets from scratch. Scroll down to "Building a Marker...

There is a post on the forum (could not quickly find it) that says not all of the Static Opt methods were made available as of 3.3 (but are supposed to be in the next coming release). The work around I came up with was to make a simple Static Opt xml template file (basically one with minimal options...

Here is some MATLAB code that is a work around: viewtopicPhpbb.php?f=91&t=6029&p=15342&start=0&view=

Brad

Clara,

Have you looked at Dominic Farris's prescribeMotionInModel.m? I have used (variations) of it successfully:
https://github.com/opensim-org/opensim- ... nInModel.m

Regards,

Brad

Bas, Availability of the Jacobian is a project that I am interested in; we use it in optimization for predictive modeling. For now we calculate it though using finite differences. Brian Umberger and Leng-Feng Lee wrote a nice paper that does something similar. But even better, they shared the code: ...

Try this: import org.opensim.modeling.* osimModel= Model(modelFile1); p=Vec3(); % This creates an empty opensim vector which will contain the location in the parent frame osimModel.getJointSet().get("ankle_r").getLocationInParent(p); %Now convert into native MATLAB double pval(1)=p.get(0); pval(2)=p...

Malavika,

I did not get any further than my responses here as my reason for doing this went away due to taking a different approach unrelated to the wrap surface. Since then I have not needed to programmaticly create a wrap surface.

Regards,

Brad

Here is a MATLAB code snippet (easily made into a function) that gets marker locations via the API. Set the coords (q) and it creates a matrix with marker locations (markerLoc) in the ground body CS: % Set the angles of the coordinates (rad). In Arm26, there are 2 coords: q=[0 0]; % Load Library imp...

Nihar, I believe you have to do the following to use the Forward Dynamics tool (or at least this is the way that works for me): 1) Your controller needs to be written in C++ and compiled and registered with OpenSim (Let OpenSim know it exists). 2) Add the controller to your model (.osim file) 3) The...