Offsets all faces by the specified distance. 

eOk if all faces are successfully offset, or an appropriate error code in other case. Returns eInvalidInput if the offsetDistance is less than -maxSide/2, where maxSide is the size of the greater side of the ModelerGeometry object's bounding box. Also, eInvalidInput is returned when the absolute value of offsetDistance is less than 1e-6.

If a face has surfaces that cannot be offset, it is removed. Therefore, the offset operation can cause the ModelerGeometry object to become invalid.