Visual3D computes all model based items using MKS units, i.e. based on meters, kilograms and seconds. An exception to this rule are joint angles, which are represented in degrees.

Visual3D expects certain common parameters to be included in the ANALOG Section of the C3D file when ANALOG data is present. If no unit parameter is available for an ANALOG signal then Visual3D defaults to interpreting the signal as being reported in Volts (V).