How to change Polygon Collider based on my animation?

Questions & Answers
1

I have a small car game, and when I move up/down and left/right, the sprite becomes different. But the physicsbody remains the same. How do I adjust physicsbody? I added a screenshot of my sprite. At the moment I have Polygon physics body as on the right one.

Here is the code that adjusts animation states:

void FixedUpdate()
{
	if (Input.GetKey(KeyCode.W)) {
		rb2d.AddForce(Vector2.up * physicsConstant);
		animator.CrossFade("CarUpIdle", 0);
	} else if (Input.GetKey(KeyCode.S)) {
		rb2d.AddForce(-Vector2.up * physicsConstant);
		animator.CrossFade("CarDownIdle", 0);
	} else if (Input.GetKey(KeyCode.D)) {
		rb2d.AddForce(Vector2.right * physicsConstant);
		animator.CrossFade("CarRightIdle", 0);
	} else if (Input.GetKey(KeyCode.A)) {
		rb2d.AddForce(-Vector2.right * physicsConstant);
		animator.CrossFade("CarLeftIdle", 0);
	}
}

43197-cars2.jpg

2

public bool iStrigger ;
//public PhysicsMaterial2D _material ;

		private SpriteRenderer spriteRenderer;
		private List<Sprite> spritesList;
		private Dictionary<int, PolygonCollider2D> spriteColliders;
		private bool _processing ;
	
		private int _frame ;
		public int Frame {
				get { return _frame; }
				set {
						if (value != _frame) {
								if (value > -1) {
										spriteColliders [_frame].enabled = false;
										_frame = value;
										spriteColliders [_frame].enabled = true;
								} else {
										_processing = true;
										StartCoroutine (AddSpriteCollider (spriteRenderer.sprite));
								}
						}
				}
		}

		private IEnumerator AddSpriteCollider (Sprite sprite)
		{
				spritesList.Add (sprite);
				int index = spritesList.IndexOf (sprite);
				PolygonCollider2D spriteCollider = gameObject.AddComponent<PolygonCollider2D> ();
				spriteCollider.isTrigger = iStrigger;
				//	spriteCollider.sharedMaterial = _material;
				spriteColliders.Add (index, spriteCollider);
				yield return new WaitForEndOfFrame ();
				Frame = index;
				_processing = false;
		}
	
		private void OnEnable ()
		{
				spriteColliders [Frame].enabled = true;
		}
	
		private void OnDisable ()
		{
				spriteColliders [Frame].enabled = false;
		}

		private void Awake ()
		{
				spriteRenderer = this.GetComponent<SpriteRenderer> ();
		
				spritesList = new List<Sprite> ();
		
				spriteColliders = new Dictionary<int, PolygonCollider2D> ();
		
				Frame = spritesList.IndexOf (spriteRenderer.sprite);
		}
	
		private void LateUpdate ()
		{
				if (!_processing)
						Frame = spritesList.IndexOf (spriteRenderer.sprite);
		}