$LastChangedDate: 2008-04-11 16:19:55 -0400 (Fri, 11 Apr 2008) $

3D math functions and vertex/matrix classes.

OSG's Matrix lacks the subscript operator[]
so a derivative was created with one as math::Matrix
(despite not being what the OSG developers intended).

Higher-level functions for graphics algorithms are at math/graphics.cc.
