private static final IsolatedTriangle triangle(
VectorXYZ v1, VectorXYZ v2, VectorXYZ v3) {
TriangleXYZ triangleXYZ = new TriangleXYZ(v1, v2, v3);
return new IsolatedTriangle(
triangleXYZ, triangleXYZ.getNormal(),
0, Collections.<List<VectorXZ>>emptyList());
}