The POINT parameters group provides information about the 3D sample data contained within a C3D file as well as some basic information about the data environment. As a result, POINT parameters such as POINT:DATA_START, POINT:FRAMES, and POINT:USED are required even if the C3D file contains only analog information without any 3D information at all. The POINT:DATA_START parameter is needed to provide a pointer to the start of the 3D point and analog storage within the file. The POINT:USED parameter enabled any software application to determine the number of 3D points recorded in the data area – thus it must be set to zero to indicate that the 3D point and analog storage area does not contain any 3D point data.
Other POINT parameters may be required by particular software applications – you will need to consult your software or hardware manufacturers documentation for details of application specific parameters and their use. It is worth noting here that every parameter and group structure has an associated description string that should be used to provide some basic information about each group and parameter.
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