public TriangleModel LoadTriangle(TriangleModel triangle)
 {
     if (m_Triangles.Contains(triangle))
     {
         return triangle;
     }
     return null;
 }
 public TriangleModel GetModel()
 {
     TriangleModel triangle = new TriangleModel(m_ax, m_ay, m_bx, m_by, m_cx, m_cy);
     return triangle;
 }