The FORCE_PLATFORM:ORIGIN parameter is an array (3,USED) of floating-point values whose interpretation depends on the type of force plate used (as set by the TYPE parameter). You should be able to find all the information that you need to calculate the correct ORIGIN values in the appropriate force plate manual supplied by the force plate manufacturer.
The ORIGIN vector is set up to enable the transformation of the force vectors as measured by the transducers, to the laboratory coordinate system via the center of the working surface (whose location is made known through the CORNERS parameter). The manufacturers’ force platform coordinate system really depends upon the signals that are output from the transducers, and may need to be modified to provide a standard right-handed coordinate system, which ORIGIN is assumed to be. Assuming a left-handed coordinate system will change the sign of one of the components.
All ORIGIN distance units must be the same as were used to express the locations of the FORCE_PLATFORM:CORNERS in the 3D coordinate system. It is important to note that every distance in a C3D file must be expressed in the same units.
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