- public static final Matrix ONE = new Matrix(1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1);
+ public static final Matrix ONE = new Matrix(1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1);
+
+ /** the identity matrix */
+ public static final Matrix NEGATIVE_ONE = new Matrix(-1,0,0,0,0,-1,0,0,0,0,-1,0,0,0,0,1);