private static Vector EdgeTorque(FDLEdge edge)
 {
     double force = 10.0 * edge.AngleDelta / K;
     double angle = edge.Angle + Math.PI / 2.0;
     return Vector.FromPolar(force, angle);
 }
 private static Vector EdgeForce(FDLEdge edge)
 {
     double force = 5.0 * edge.LengthDelta / K;
     double angle = edge.Angle;
     return Vector.FromPolar(force, angle);
 }