public static bool isInFront(Vector2 viewersPosition, Vector2 viewersDirection, Vector2 positionInQuestion)
{
viewersDirection.normalize();
return dot(viewersDirection, positionInQuestion - viewersPosition) > 0F;
}
/// <summary>returns the internal angle (radian) between the 2 Vectors</summary>
public static float internalAngle(Vector2 v1, Vector2 v2)
{
v1.normalize();
v2.normalize();
return (float)Math.Acos(dot(v1, v2));
}