SoVRMLBillboard(3) on Linux
The text df08dca0a8b3, as Debian 6.0 (Squeeze) shipped it.
The SoVRMLBillboard class is used for rotating geometry towards the viewpoint. 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:.