The description of the storage of analog data parameters in the C3D file header has been re-written and the description of analog data storage has been expanded. An example has been added to demonstrate how the various parameters that describe the analog data are calculated. The original descriptions contained a couple of errors and were hard to understand.
This release restores a chapter on additional C3D parameters that provides information on parameters and groups that have been introduced to the C3D file format by various software applications or motion capture manufacturers. These groups are becoming common in C3D files, notably the MANUFACTURER and EVENT groups, together with other groups such as the SEG and TRIAL groups that provide additional information, but are not required by the original C3D format description. The EVENT and EVENT_CONTEXT groups are particularly interesting as they provide a flexible method of storing event and other time specific data within the existing C3D format using parameters.