Stop raycast from hitting same gameObject twice

Question

I've created a script now that can detect all enemies in a radius. In order to stop enemies who are behind walls from being harmed by the explosion radius, a raycast is sent out in order to ensure that it hits an enemy and not a wall. Unfortunately, if there are two enemies in the same direction, then two raycasts are going to be sent towards the same enemy, thus hitting them multiple times.

My question is: How can I stop an enemy standing in front of another enemy from being hit by a raycast that is intended to hit the object behind it?

 if(collision.gameObject.tag == "Enemy") { collision.gameObject.SendMessage("takeDamage", 125); }
         grenadeBody.velocity = Vector3.zero; 

         Collider[] collisionsInRadius = Physics.OverlapSphere(transform.position, 3f); //Needs layermask so it only detects gameobjects with enemy tag.  
         for(int i = 0; i < collisionsInRadius.Length; i++)
         {
             Ray explosionRay = new Ray(transform.position, collisionsInRadius[i].transform.position - transform.position);
             if (Physics.Raycast(explosionRay, out RaycastHit explosionHit, 3f))
             {
                 if(explosionHit.collider.gameObject.tag == "Enemy")
                 {
                     collisionsInRadius[i].gameObject.SendMessage("takeDamage", 225);
                 }
             }
         }
         //play explosion effect.  
         Destroy(this.gameObject);

Answer 1

Answer by Zaeran · May 17, 2019 at 04:23 PM

You'd likely have to do a Physics.RaycastAll, and then order the hit colliders by distance. Iterate through from closest to furthest, and stop when you hit a wall.

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xthunderduckx · May 17, 2019 at 05:30 PM 0

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So does Physics.RaycastAll send out a ray and the ray continues regardless of the number of times it hits an object?

if that's true, I could sort them by distance, and then apply damage to all gameObjects with tag enemy, and if the distance of a wall is closer than the distance of one of the enemies, then ignore whatever is past it right?

Thanks.

xthunderduckx · May 20, 2019 at 02:45 PM 0

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Actually, never$$anonymous$$d. This doesn't actually answer my question. $$anonymous$$y script already did that as I realize now, except it did raycast all. This still doesn't solve my issue with an enemy having the potential to be hit multiple times.

Answer 2

Answer by xxmariofer · May 20, 2019 at 03:35 PM

just create a list on Colliders

 List<Collider> colliders = new List<Collider>();

change raycast for raycastall

 RaycastHit[] hits;
 hits = Physics.RaycastAll(transform.position, collisionsInRadius[i].transform.position - transform.position, 100.0F);

 foreach(RaycastHit hit in hits) {  
    if(hit.collider.gameObject.tag == "Enemy" && !colliders.Contains(hit.collider))  { collisionsInRadius[i].gameObject.SendMessage("takeDamage", 225); colliders.Add(hit.collider); }
 }

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Stop raycast from hitting same gameObject twice

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