This class implements a 3x3 real-valued matrix.
Individual elements are represented with double precision
floating point numbers. To use the Mat3 class you must include the
header
#include <gfx/mat3.h>
The Mat3 class defines the following set of constructors:
// Initialize all elements to 0
Mat3();
// Initialize rows with given vectors
Mat3(const Vec3& r0,const Vec3& r1,const Vec3& r2);
// Copy values from A
Mat3(const Mat3& A);