Format is tab separated boolean geometry.
Name                          	Value
_object	booleangeometry
version	2010-03-29
_object	trianglemesh
id	tetrahedron
	_object	matrix4x4
	m11	0.0
	m13	1.0
	m21	-1.0
	m22	0.0
	m32	-1.0
	m33	0.0
	_table	vertex
	x	y	z
	-5.0		2.89
			-5.77
	5.0		2.89
		8.66
	_table	face
	vertex0	vertex1	vertex2
	3	0	1
	3	1	2
	3	2	0
	0	2	1