/// <summary>
/// Finds the midpoint between two points on the unit sphere
/// </summary>
private Vertex CreateMidpoint(Vertex one, Vertex two)
{
Vector3D midpoint = Vector3DExtensions.Midpoint(ConvertToVector3D(one.Position), ConvertToVector3D(two.Position));
double u = midpoint.Azimuthal() / (2 * Math.PI);
double v = midpoint.Polar() / Math.PI;
midpoint.Normalize();
return(new Vertex(ConvertToPoint3D(midpoint), midpoint, new Point(u, v)));
}