Raw data

The C3D format considers raw data to be the initial, relatively unprocessed, data sample from the data collection environment.  But in a typical 3D photogrammetry environment, the 3D point locations are a result of the motion capture system processing 2D images to calculate a 3D location that is stored in the C3D files as a raw data sample.  The C3D format was originally designed to store analog data as raw data binary sample values from an ADC that can be scaled to real-world values.