Presented by Adam Galloy1, Kayt Frisch PhD1, and Dylan Schmitz2
1Dordt College, 2University of Wisconsin-Madison
Contact: kayt.frisch@dordt.edu
3D marker coordinate data exported from a motion capture system will likely require some preparation before it is compatible with an OpenSim model. This page provides an overview of the different preparations that you may need to make before marker data is compatible with an OpenSim model. The process of preparing data has been made significantly easier by the tools developed by the OpenSim community. These tools simplify and automate much of the data preparation. These can be found in the Tools for Preparing Motion Data page.
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OpenSim 4.0 includes new tools for preparing motion capture data that are not covered in this section. By looking in the CodeExamples folder in your OpenSim 4.0 files folder a Matlab script titled c3dExport.m is available. We recommend looking at this example script for more information on how to use OpenSim 4.0's new tools to make motion data preparation more convenient. |
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Preparing File Format
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Motion capture systems may export data in a different coordinate system than the OpenSim model desired for analysis. If the lab coordinate system is rotated from the model coordinate system, then analysis will require a coordinate transformation beforehand. However, if the lab coordinate system is only translated from the model coordinate system then a coordinate transformation may not be necessary as long as external forces are applied in a way that agrees with the marker data. Details on how to reconcile coordinate systems are given in THIS PAGE. the Coordinate Systems in OpenSim page.
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Next: Preparing Force Data Previous: Preparing a Model for Analysis Home: ASB 2018: Pipeline Shared by Dordt College and UW Madison |