//public NavigationTriangle(Vector3 a, Vector3 b, Vector3 c)
public NavigationTriangle(Edge e1, Edge e2, Edge e3)
{
//m_neighbours[0] = null; // neighbour on a -> b side
//m_neighbours[1] = null; // neighbour on b -> c side
//m_neighbours[2] = null; // neighbour on c -> a side
m_edge1 = e1;
m_edge2 = e2;
m_edge3 = e3;
Vector3 a,b,c;
m_edge1.getCommonVertex(m_edge3, out a);
m_edge1.getCommonVertex(m_edge2, out b);
m_edge2.getCommonVertex(m_edge3, out c);
m_corners[0] = a;
m_corners[1] = b;
m_corners[2] = c;
m_dirs[0] = Vector3.Subtract(c, a);
m_dirs[1] = Vector3.Subtract(b, a);
m_normal = Vector3.Cross(m_dirs[0], m_dirs[1]);
m_normal.Normalize();
}