Search found 289 matches

by Aaron Fox
Tue Nov 12, 2024 5:21 pm
Forum: OpenSim
Topic: Handling Data from 5 Force Plates
Replies: 8
Views: 2694

Re: Handling Data from 5 Force Plates

Hi Mahshida,

I'm pretty sure that will get fixed up straight away if you change the ordering of the columns in your .mot file. Just look at the column order in one that displays appropriately from the example resource folders and then replicate that - it should be a quick fix.

Aaron
by Aaron Fox
Wed Nov 06, 2024 5:24 pm
Forum: OpenSim
Topic: Automatic Scaling Tool - Isssue
Replies: 4
Views: 459

Re: Automatic Scaling Tool - Isssue

Hi Kevin, Not sure if the automatic scaling tool will allow you to do this as I'm unfamiliar, but in traditional scaling you can also add weights to joint coordinates to be a certain value (e.g. 0 degrees if you are confident they are in a neutral position). These coordinate scales also have weights...
by Aaron Fox
Wed Nov 06, 2024 5:21 pm
Forum: OpenSim
Topic: Handling Data from 5 Force Plates
Replies: 8
Views: 2694

Re: Handling Data from 5 Force Plates

Hi Mahshida, I recently learnt that the order of the GRF components in the .mot file (i.e. the force, point and torque data) needs to be a particular way (I think it needs to be 3 x force, 3 x point, 3 x torque) for it to display correctly in the GUI visualiser. I had them in a different order and I...
by Aaron Fox
Thu Aug 29, 2024 8:39 pm
Forum: OpenCap
Topic: OpenCap Calibration Origin
Replies: 3
Views: 365

Re: OpenCap Calibration Origin

Hi Matt, Unfortunately no, I don't think we were that precise with how we placed each time - particularly as we were experimenting with camera positions and moving things a little around in the early stages. This is useful info for next time though. As an FYI the calibration of sorts between the sta...
by Aaron Fox
Wed Aug 28, 2024 4:46 pm
Forum: OpenCap
Topic: Processing and Camera Issues
Replies: 0
Views: 150

Processing and Camera Issues

Hi OpenCap Team, I'm wondering if there is a way to check some potential processing and camera issues from recent sessions we've run. Across a session we have some trials that work and others that haven't, and when trying to reprocess these locally the Python console either outputs that the trial fa...
by Aaron Fox
Tue Aug 27, 2024 6:32 pm
Forum: OpenCap
Topic: OpenCap Calibration Origin
Replies: 3
Views: 365

OpenCap Calibration Origin

Hi OpenCap Team, I have reviewed this and this forum post, and I can gather that the opencap origin/global coordinate relates to the position of the checkerboard origin. We are collecting opencap data concurrently with a motion capture system and I would like to be able to align the coordinate syste...
by Aaron Fox
Tue Aug 27, 2024 4:33 pm
Forum: OpenSim Moco
Topic: Analyze Moco Trajectory in C++
Replies: 2
Views: 296

Re: Analyze Moco Trajectory in C++

Hi Nick, That makes sense given I could get various other types to work but not the Vector. I was trying to compute a new output from a custom class I've created - but have since realised that maybe a Vector isn't the best data type for an output in the end - or I might not end up using an output an...
by Aaron Fox
Sun Aug 25, 2024 3:38 pm
Forum: OpenSim Moco
Topic: emg and marker tracking
Replies: 3
Views: 304

Re: emg and marker tracking

Hi Mohammad, I don't think the offset times will work and there is now way to set different times from what I understand. I think OpenSim will always look for corresponding time stamps across all different data types. The easy solution here is to edit/synchronise the original data files so that the ...
by Aaron Fox
Thu Aug 22, 2024 9:10 pm
Forum: OpenSim Moco
Topic: Analyze Moco Trajectory in C++
Replies: 2
Views: 296

Analyze Moco Trajectory in C++

Hi Moco Team, I'm trying to apply the analyze() command to a Moco trajectory in C++ to get a model component output which is a SimTK Vector type. I get an error ('SimTK::VectorBase<ELT>::TNeg': cannot access private typedef declared in class 'SimTK::VectorBase<ELT>') with the following code: analyze...
by Aaron Fox
Wed Aug 14, 2024 8:00 pm
Forum: OpenSim
Topic: Invers Kinematics of upside down Motion Capture data
Replies: 1
Views: 298

Re: Invers Kinematics of upside down Motion Capture data

Hi Lucy, This might be due to the allowable motion for pelvis rotation, list and tilt. I've had similar issues where the pelvis could only rotate 90 degrees yet it needed to go 180 degrees as a participant was moving in the opposite direction to usual. IK then fits as best it can within the allowabl...