// returns false if angle>180
bool CalculateMiddlePoint()
{
Vector2 v21 = corner2.Point - corner1.Point;
float angle1 = VectorUtil.UnsignedAngleRad(v21, corner1.DirMain); // expected Accute
float angle2 = VectorUtil.UnsignedAngleRad(-v21, corner2.DirMain); // expected Accute
float c = Mathf.PI * .5f - Epsilon;
if (angle1 >= c || angle2 >= c)
{
Log.Debug("Roundabout angle >= 180");
return(false);
}
var b2 = BezierUtil.Bezier2ByDir(
corner1.Point, corner1.DirMain,
corner2.Point, corner2.DirMain);
MiddlePoint = b2.Travel2(b2.ArcLength() * .5f, out MDir2);
MDir1 = -MDir2;
return(true);
}