CAD Exchanger SDK
CAD Exchanger implicitly uses millimeter as a unit of length measurement.
Respective scaling is applied when importing from/exporting to formats, which explicitly set file units (e.g. IGES, STEP,...) or have convention on units (e.g. Parasolid, VRML, X3D). When importing from/exporting to formats, which do not explicitly set units (e.g. BRep or STL), no scaling is performed.
Respectively, all length (or derived) parameters provided via SDK API are assumed to be in millimeters. Likewise, coordinates retrieved from B-Rep or polygonal representations are in millimeters.