The EVENT group (and an associated EVENT_CONTEXT group) has been added to work around the limit of a maximum of 18 events in the C3D file header. This implementation works quite well although it seems to have been implemented rather inelegantly, requiring 13 different parameters in two separate groups with very little documentation of the functions of the parameters. The descriptions presented here are based on the descriptions provided by the manufacturer and from the direct examination of C3D data files.
The basic idea behind this implementation is very much like the concept of the existing header record events, a count of the total number of events is maintained and then used it as an index to access the event times, status etc. It differs in that it allows events to be placed in a context that can be used to organize and group events in an open-ended and flexible manner.
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