The GLE Tubing and Extrusion Library is a graphics application
programming interface (API).  The library consists of a number of "C"
language subroutines for drawing tubing and extrusions.  The library is
distributed in source code form, in a package that includes documentation,
a VRML proposal, Makefiles, and full source code and header files.  It
uses the OpenGL (TM) programming API to perform the actual drawing of the
tubing and extrusions.