How does Joint Reaction in OpenSim solve joints forces

[ZHONG WEI]

First,I know the steps of solving joint forces with JointReaction in Opensim.
I would like to know the algorithm and data used to solve joint forces in JointReaction,because I want to obtain the force of human lower limbs during walking in reality.
Thank you for your answers or for your better ideas

[Thomas Uchida]

The code can be found in JointReaction.cpp; you can see the implementation of the JointReaction::record() method here: https://github.com/opensim-org/opensim- ... n.cpp#L533.

[ZHONG WEI]

The code can be found in JointReaction.cpp; you can see the implementation of the JointReaction::record() method here: https://github.com/opensim-org/opensim- ... n.cpp#L533.

Thanks for your answer! I will look at the code and look forward to communicating with you.

[ZHONG WEI]

The code can be found in JointReaction.cpp; you can see the implementation of the JointReaction::record() method here: https://github.com/opensim-org/opensim- ... n.cpp#L533.

hello,Thomas.
I would like to consult you the following questions
I hope to get the ground reaction forces and joint forces of different models in the process of walking, can those be obtained from Tool-analyzer-JointReaction and ForceReporter?
I have tried to implement it with different models, but the curves of calcn_r_right_foot_Fx, Fy ,Fz are the same( whether these curves can represent ground reaction?), and the data of the curves are all the same as that in subject01_walk1_grf.mot, which makes me confused.
I want to figure it out what the input and output in Tool-analyzer-JointReaction and ForceReporter (such as a picture in scale), which can help me to collect the data by myself later to get the ground reaction forces and joint forces of different models in the process of walking
A picture like the one below file makes it very clear what is the output and what is the input.
Thanks for your help in advance!