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Tracking data can be exported into the C3D file format. C3D (Coordinate 3D) is a binary file format that is widely used especially in biomechanics and motion study applications. Recorded data from external devices, such as force plates and NI-DAQ devices, will be recorded within exported C3D files. Note that common biomechanics applications use a Z-up right-hand coordinate system, whereas Motive uses a Y-up right-hand coordinate system. More details on coordinate systems are described in the later section. Find more about C3D files from https://www.c3d.org/.
(Exported unit maybe rescaled to a standard unit when imported into another software.)
Since Motive uses a different coordinate system from the system used in common biomechanics applications, it is necessary to modify the coordinate axis to a compatible convention in the C3D export settings. When exporting to
biomechanics analysis applications using z-up right-handed convention (e.g. Visual3D), the following changes on the axes should be made under the custom axis settings.
Note: For Motive 1.10, Y axis must be converted to positive Z instead, this issue has been fixed on Motive 1.10.1.
This is a convenience option for setting the axes for use in Autodesk MotionBuilder. Even though Motive and MotionBuilder both use the same coordinate system, MotionBuilder assumes biomechanics standards when importing C3D files (negative X axis to positive X axis; positive Z to positive Y; positive Z to positive Y). Accordingly, when exporting C3D files for MotionBuilder use, set the Axis setting to MotionBuilder Compatible, and the axes will be exported using the following convention: