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Question by Dodokom · Jul 26, 2019 at 01:08 PM · enemycolliderspathfindingenemy aiastar

How to make enemies take wider routes?

I'm currently using A* pathfinding to mainly control my enemy's movement, however, I'm having a problem with it being constantly in contact with the collider, and it struggling to get around the corners. I would make the margins wider, but the problem there is that its destination is next to the collider, so that's not an option. The yellow boxes in the image are the potential destinations. Any advice or ideas? Thanks in advance! alt text

example.png (235.4 kB)
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Answer by blinkafrootable · Jul 26, 2019 at 02:56 PM

I suggest that you change the A* algorithm to not allow diagonal movement if there is an object adjacent to the enemy. This image demonstrates what I'm talking about: alt text If you're wondering how exactly you might implement that in code then I'd like to see the code you used for the algorithm.

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avatar image Dodokom · Jul 26, 2019 at 03:58 PM 0
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I thought unticking cut corner was supposed to do that? Regardless, here's the part of my code that uses A*:

 using UnityEngine;
 using Pathfinding;
 
 public class Temp : $$anonymous$$onoBehaviour
 {
     //pathfinding variables
     Seeker seeker;
     public Path path;
     public float nextWaypointDistance = 3;
     private int currentWaypoint = 0;
     public bool reachedEndOfPath;
     Vector2 dir;
     public float pathUpdateRate = 2f;
 
     //cover-checking variables
     Collider2D[] coversNearby = new Collider2D[50];
     Collider2D closestCover;
     float closestCoverDistance = 15f;
     public static bool inCover;
 
     void Update()
     {
         if (path != null)
         {
             reachedEndOfPath = false;
             float distanceToWaypoint;
             while (true)
             {
                 distanceToWaypoint = Vector2.Distance(transform.position, path.vectorPath[currentWaypoint]);
                 if (distanceToWaypoint < nextWaypointDistance)
                 {
                     if (currentWaypoint + 1 < path.vectorPath.Count)
                     {
                         currentWaypoint++;
                     }
                     else
                     {
                         reachedEndOfPath = true;
                         break;
                     }
                 }
                 else
                 {
                     break;
                 }
             }
             dir = (path.vectorPath[currentWaypoint] - transform.position).normalized;
         }
     }
 
     void FixedUpdate()
     {
 
         if (closestCover != null)
         {
             rb2d.AddForce((dir) * movementSpeed);
         }
     }
 
     void GetClosestViableCover()
     {
         closestCoverDistance = 15f;
 
         int numberOfCovers = Physics2D.OverlapCircleNonAlloc(transform.position, 15f, coversNearby, mask2);
         for (int i = 0; i < numberOfCovers; i++)
         {
             float distanceFromCover = Vector2.Distance(coversNearby[i].transform.position, transform.position);
             if (distanceFromCover < closestCoverDistance)
             {
                 closestCoverDistance = distanceFromCover;
                 closestCover = coversNearby[i];
                 seeker.StartPath(transform.position, closestCover.transform.position, OnPathComplete);
             }
 
         }
     }
 
     public void OnPathComplete(Path p)
     {
         if (!p.error)
         {
             path = p;
             currentWaypoint = 0;
         }
     }
 
 }

avatar image blinkafrootable · Jul 26, 2019 at 04:40 PM 0
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Where in your code is the boolean cut corner implemented? I don't see anything that indicates that the code checks to see if adjacent waypoints are open

avatar image Dodokom blinkafrootable · Jul 26, 2019 at 04:59 PM 0
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It's not in my own script, it's in the "Astar Path" script. alt text

example2.png (30.7 kB)

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