*Tri45a, Triangles at 45 degrees.
 45,  0,0, 4.2426407,4.2425407, 1.4142136,-2.8284271
135,  0,0, 4.2426407,4.2426407, 1.4142136,-2.8284271
  0, -1,1, 3,3,                 2,-4