Unity2D raycast to check for a wall, Issues. ~Still not solved...Anybody?~

Question

Hello my fellow Unity friends I have an issue.

I'm using a basic blink (teleport) ability which just directly shifts the player's transform. the problem is I have certain walls I don't want the player to be able to teleport through. I'm trying to use the below script to prevent the player when they are at a 1.5 distance from the "Barriers". This distance is the exact blink distance the player can move. Edit: This function is called in a fixed update

If any more information is needed, I have more. Thank you all in advance! :D

Edit (1/1/2018): Code now gives the error: NullReferenceException: Object reference not set to an instance of an object Blink.BarrierCheck () (at Assets/Scripts/Hope/Abilities/Blink.cs:41) Blink.FixedUpdate () (at Assets/Scripts/Hope/Abilities/Blink.cs:30)

 public class Blink : MonoBehaviour
 {
 
 
     public bool CanBlink;
     public bool Allowblink;
     public Animator Anim;
     public GameObject Player;
     public Vector3 OldPos;
     public Vector3 NewPos;
     public float BlinkCooldown;
     Movement movement;
 
     public void Start()
     {
         CanBlink = true;
         Allowblink = true;
         Player = GameObject.FindGameObjectWithTag("Player");
         movement = GetComponent<Movement>();
         BlinkCooldown = 3.0f;
 
     }
 
     public void FixedUpdate()
     {
         BarrierCheck();
         BlinkWatcher();
     }
 
     public void BarrierCheck()
     {
 
         if (GameObject.FindGameObjectWithTag("Player").GetComponent<Movement>().facingRight)
         {
             RaycastHit2D hit = (Physics2D.Raycast(transform.position, transform.right, 3f, (LayerMask.GetMask("Barrier"))));
             Debug.DrawRay(transform.position, transform.right, Color.black);
             if (hit.collider.CompareTag("Barrier"))
             {
                 Allowblink = false;
                 Debug.Log("Collider was hit");
             }
             else
             {
                 Debug.Log("Null ray");
             }
         }
         else
         {
             RaycastHit2D hit = (Physics2D.Raycast(transform.position, -transform.right, 3f, (LayerMask.GetMask("Barrier"))));
             Debug.DrawRay(transform.position, -transform.right, Color.black);
             if (hit.collider.CompareTag("Barrier"))
             {
                 Allowblink = false;
                 Debug.Log("Collider was hit");
             }
             else
             {
                 Debug.Log("Null ray");
             }
         }
     }
 
     public void BlinkWatcher()
     {
         BlinkCooldown -= Time.deltaTime;
 
         if (Input.GetKey(KeyCode.Mouse1) && CanBlink && Allowblink && BlinkCooldown <= 0f)
         {
             float x = movement.facingRight ? 3f : -3f;
             Player.transform.position += new Vector3(x, 0f, 0f);
             BlinkCooldown = 3.0f;
         }
 
 
     }
 }

Answer 1

Hmm. Could be a number of things.

Maybe try changing it to a public bool BarrierCheck();

Then, instead of setting Allowblink to false, you can return false or true on whether or not they can blink. (this will only fix if your allowblink is being overridden to true somehow, and I have no idea whether that'd be true or not, just a random thought)

Also, when having troubles, it's always good to have a Debug.DrawRay mimicing the raycast in my experience. It's pointed out some very obvious problems for me in the past.

I also believe the 'tag.Equals' isn't the best way to do it nowadays. The method I learned was 'CompareTag("Tag")'

I could be wrong, and if it works, it works.

Beyond that, you can use layermasks to simplify the function, and make sure it isn't being clipped by another collider. Add the barrier to a new Layer in the inspector (Right above the Transform component) If it's your first custom layer it will be 8, so I'll assume that:

 int layermask = (1 <<  8); // Will only hit layer 8
 
 int layermask = ~(1 << 8); // Will hit everything but layer 8
 
 int layermask = ~(1 << 8 | 1 << 9); // will hit everything but layers 8 and 9
 
 int layermask = (1 << 8 | 1 << 9); // will hit only layers 8 and 9

Answer 2

Answer by Lumineux · Dec 27, 2017 at 11:38 AM

The code seems right. Make sure the tag of your barriers is correctly written.

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mmaalex22112 · Dec 27, 2017 at 08:02 PM 0

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I already deleted their tags and copied them right out of the script, no luck there

Unity2D raycast to check for a wall, Issues. ~Still not solved...Anybody?~

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