Shape Rotation у Particle System

public class Particles : MonoBehaviour
{
   // public Vector3 Direction;
    public ParticleSystem PS;
   public bool WeapR;
    public int updown;
    void Start()
    {
        Direction = GetComponent<ParticleSystem>().shape.rotation;
        WeapR = GameObject.Find("Player").GetComponent<PlayerController>().facingRight;
        updown = GameObject.Find("Player").GetComponent<PlayerController>().updown;
       
    }
 
 
    void Update()
    {
        if (WeapR == true && updown == 0)
        {
            PS.shape.rotation.y(-90);
           // Direction=new Vector3(0,-90,0);
        }
        else if (WeapR == false && updown == 0)
        {
            //Direction = new Vector3(0, 90, 0);
        }
        else if (updown == 1)
        {
           // Direction = new Vector3(0, 180, 0);
        }
        else if (updown == -1) 
        {
           // Direction = new Vector3(0, 0, 0);
        }
    }
}

PS.shape.rotation.y(-90);

PS.shape.rotation = PS.shape.rotation + new Vector3(0, -90, 0));

var shape = PS.shape;
shape.rotation = shape.rotation + new Vector3(0, -90, 0));
PS.shape = shape;

var shape = PS.shape;
shape.rotation = shape.rotation + new Vector3(0, -90, 0));