public static void AddPerpendicularQuadsTriangles(this MeshDataBuffer buffer)
        {
            buffer.AddTriangle(0, 3, 2);
            buffer.AddTriangle(2, 1, 0);

            buffer.AddTriangle(3, 0, 1);
            buffer.AddTriangle(1, 2, 3);
        }
 public static void AddCubeTriangles(this MeshDataBuffer buffer)
 {
     buffer.AddTriangle(0, 3, 2);
     buffer.AddTriangle(2, 1, 0);
 }