The source code files under this catalog and its subcatalogs are files
that are shared outside just Coin to other SIM Coin-related projects,
like e.g. SIM Scenery, SIM Voleon, to the stable Coin-2 branch,
So@Gui@-libraries, and others.
This is done for two main reasons:
* To avoid code duplication.
As an example, consider what was done with OpenGL support code in
SIM Scenery -- it ended up extremely similar to Coin's ditto.
* To avoid having to add "inter-Coin3D"-stuff to the public API of
Consider what was done with e.g. the OpenGL-wrapper stuff under
src/glue/, where the public API was extended again and again -- in
ways of no interest to application programmers -- to accommodate
SIM Voleon and other projects.
(The OpenGL-wrapper will probably be migrated to eventually lay
under this directory.)