off-simple-0.1: tests/samples/tetra.offc

OFFC
4 4 6
        0.0 0.0 2.0
	1.632993 -0.942809 -0.666667
	0.000000 1.885618 -0.666667
	-1.632993 -0.942809 -0.666667
3	1 0 3	0.784 0.000 0.000
3	2 0 1	0.000 0.784 0.000
3	3 0 2	0.000 0.000 0.784 
3	3 2 1	0.784 0.000 0.784