I am looking to implement a plugin that allows the paths of muscles to be approximated, with the hope of speeding up computations. Basically this plugin would provide quick calculation of muscle-tendon lengths and moment arms (e.g. look up tables), and allow existing tools (ID, FD etc) to run withou...

I have been having the same issue with version 3.3. The model display won't refresh unless I perform some kind of manual input that forces it to refresh (zoom in/out, rotate, etc). Even motions won't animate. I don't have this issue with version 3.2.

I actually just got my Tool to compile and it can be loaded from the OpenSim gui (it calls the constructor, then deconstructor, and says was loaded).

Is there a way to call the Tool's run() function from the gui, parsing in the current model file?

Hey all. I am trying to make a custom plugin Tool similar to the scale tool. I have followed the guides on making a custom Analysis plugin, but have struggled to do the same for a custom tool. Firstly, I am trying to create the tool plugin such that it can be run via the GUI. It this possible? Secon...

Hi everyone, In the past I have written code utilizing OpenSim 3.0's 32-bit libraries. I now need to combine this code with some other libraries which are 64-bit. I was pleased to see that OpenSim 3.1 is available in both 32 and 64 bit. My questions is, are there any significant changes/limitations ...

Hi, How do you access the MomentArmSolver? Thanks, Hi Morgan, Here is some sample code that implements the MomentArmSolver. The iGenCoords parameter is a SimTK array of ints containing the indicies of the joints I wish to calculate the moment arms for. It returns a [nMuscles x nJoints] matrix of mo...

Thanks for all the information. I have used a number of different methods in the past. I have used both the MomentArmSolver as well as the muscle.computeMomentArm() function, and both worked well. However for my application I found that it was quicker for me to implement my own routine which basical...

Hi Sherm, Sorry for the late reply. I want to explicitly calculate (as quick as possible) for a given pose a matrix containing the moment arms. I use it in my work to relate upper limb muscle strength to the strength at the hand in different directions. I was using OpenSim's computeMomentArm() funct...

Hi all, I am trying to calculate the muscle moment arms using the method described in document "How to compute muscle moment arm using generalized coordinates" http://wiki.simtk.org/opensim/FrontPage?action=AttachFile&do=get&target=HowToComputeMuscleMomentArm.pdf I am using the Generalized force met...

<r>Hello,<br/> <br/> I am currently trying to replicate the calculations that OpenSim performs when computing muscle actuator force. My issue is that I keep getting results that differ from OpenSim, particularly at low levels of activation.<br/> <br/> The model uses the Schutte1993Muscle actuator.<b...