How can I produce .mot without having .trc ?

[Yunus Rezvanifar]

Hey everyone

In case of not having access to MOCAP equipments and/or IMU equipments
1) is there any other way to have .mot file?
2) Is it possible to use someone else's .trc file and scale it to someone else's anthropometric dimensions and use it to make .mot file?

Best regards.

[Thomas Uchida]

You could use experimental data collected by someone else (several projects on simtk have shared experimental data). You could also generate it using a model, but it depends what you are trying to do with it. You could use existing data and scale it somehow, but you are likely to have very large errors.

[Yunus Rezvanifar]

You could also generate it using a model

Could you explain more please?

but it depends what you are trying to do with it.

I'm trying to solve femur finite element model considering muscle forces .

.mot is one of my problems to do a valid, accurate simulation.

[Ayman Habib]

Hello,

.mot file is just a text file that you can create in any text editor, following the examples provided with the distribution. Some description of the format is given here
https://simtk-confluence.stanford.edu/d ... na.motFile

A motion file is not a simulation, it is a description of a trajectory/kinematics. When you have a trc file for motion capture and provide a model, you can solve IK you get a motion file. motion files do not support muscle states, to get these you have to run a forward simulation or use an inverse method to compute muscle states and forces.

Hope this helps,
-Ayman

[Yunus Rezvanifar]

Hi Ayman
Thanks for the reply
Yah, I'm seeking for a way to calculate muscle forces with OpenSim while the subjects .trc file is not available?
Is there a way to use someone .trc to obtain someone else's .mot file?

muscle states, to get these you have to run a forward simulation

Could you tell me more about this, please?

Thanks

[Thomas Uchida]

Could you tell me more about this, please?

I suggest checking out the documentation that describes the capabilities of the software (e.g., the "Overview of the OpenSim Workflow" page: https://simtk-confluence.stanford.edu/d ... m+Workflow). There are also examples (https://simtk-confluence.stanford.edu/d ... +Tutorials) that demonstrate some of these capabilities.