/// <summary>
/// cos of angle in current point
/// </summary>
/// <param name="b">prevois point</param>
/// <param name="c">next point</param>
/// <returns>cos</returns>
public double cos_azimut(Point3D b, Point3D c)
{
if (b == null)
{
return(1);
}
if (c == null)
{
return(0);
}
return((Sqr(this.dist(b)) + Sqr(this.dist(c)) - Sqr(b.dist(c))) / (2 * this.dist(b) * this.dist(c)));
}
/// <summary>
/// cos of angle in current point
/// </summary>
/// <param name="b">prevois point</param>
/// <param name="c">next point</param>
/// <returns>cos</returns>
public double cos_azimut(Point3D b, Point3D c)
{
if (b == null) return 1;
if (c == null) return 0;
return ((Sqr(this.dist(b)) + Sqr(this.dist(c)) - Sqr(b.dist(c))) / (2 * this.dist(b) * this.dist(c)));
}
