///<summary>random байрлал [a, b]</summary>
public static Vector3 Pos(Vector3 a, Vector3 b)
{
Vector3 min = V3.Min(a, b), max = V3.Max(a, b);
return(new Vector3(Rng(min.x, max.x), Rng(min.y, max.y), Rng(min.z, max.z)));
}