SoVRMLViewpoint(3) on Linux
The text 3c737e0d2570, as Debian 8 (Jessie) shipped it.
The SoVRMLViewpoint class is a perspective camera class. 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: