Search found 4 matches

by Pranav Mamidanna
Tue Jan 16, 2018 5:37 am
Forum: OpenSim
Topic: Computing muscle fiber lengths using the Python API.
Replies: 12
Views: 1932

Re: Computing muscle fiber lengths using the Python API.

1. As per your first suggestion, I have changed the weights for the coordinates in the assemble method between 20 and 100 and found no difference in the fiber-length vs time curves. 2. Using realizePosition(init_state) instead of equilibrateMuscles(init_state) somehow leads to no variation in the fi...
by Pranav Mamidanna
Mon Jan 15, 2018 7:06 am
Forum: OpenSim
Topic: Computing muscle fiber lengths using the Python API.
Replies: 12
Views: 1932

Re: Computing muscle fiber lengths using the Python API.

Hi Dimitar, Thanks for the quick response. I have tried all the ways you mentioned above, but it seems like I could not make them work! There is no change in the results by altering the weights in the assemble method, while using realizePosition does not update the muscle lengths at all - in fact by...
by Pranav Mamidanna
Sun Jan 14, 2018 4:06 pm
Forum: OpenSim
Topic: Computing muscle fiber lengths using the Python API.
Replies: 12
Views: 1932

Computing muscle fiber lengths using the Python API.

Hi all, I am using OpenSim 4.0 API (Python) in order to calculate muscle length changes given a state trajectory (sequence of coordinate values through a motion file). As a first test, I used the Arm26 model and the motion file within to verify if my results match. The model can be found at '<source...
by Pranav Mamidanna
Tue Nov 28, 2017 5:09 pm
Forum: OpenSim
Topic: Inverse Kinematics that only uses end-effector position.
Replies: 2
Views: 224

Inverse Kinematics that only uses end-effector position.

Hi Devs! I am very new to OpenSim, and I was wondering if it is possible to get joint space configuration for the StanfordVA UpperExtrimity model upon specifying just the end-effector (say finger) position trajectories? (i.e, [x,y,z,t] of end-effector to elv_ang, shoulder_rot, shoulder_elv,...)? I s...