SoVRMLOrientationInterpolator(3) on Linux
The text c9c7b9b9da56, as Debian 8 (Jessie) shipped it.
The SoVRMLOrientationInterpolator class is used to interpolate orientations. The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC 14772-1:1997). It is copyright The Web3D Consortium, and is used by permission of the Consortium: