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Question by Paricus · Dec 17, 2016 at 03:39 PM · arraylistdelegatecomparesort

Sorting a list by distance to an object?

Hi. I think similar questions have been answered already, but I have had a hard time understanding those answers.

Basically, I want to sort a list of transforms by distance to the player, so the closest transform is at the top and of the list and farthest is at the bottom. I don't use lists that often so I'm not too familiar with their sort functions or how they work. A sample script or explanation would be greatly appreciated.

Thanks.

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Answer by Paricus · Dec 17, 2016 at 04:51 PM

This ended up working for me, never used linq or OrderBy before so I'm still not too sure why this works but it does. If someone has a better method or can explain this method, I'd be happy to hear it.

    using UnityEngine;
     using System.Collections;
     using System.Linq;
     
     public class SortDistance : MonoBehaviour {
     
         public GameObject[] points;
         public GameObject sphere;
     
         void Start()
         {
             points = points.OrderBy(point => Vector3.Distance(sphere.transform.position, point.transform.position)).ToArray();
     
             foreach (GameObject point in points)
                 Debug.Log(point.name);
         }
     }


 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class SortDistance : MonoBehaviour
 {
 
     public GameObject sphere;
     public List<Transform> spawnPoints;
 
     void Start()
     {
         Sort();
     }
 
     void Sort()
     {
         spawnPoints.Sort(delegate (Transform a, Transform b)
       {
           return Vector3.Distance(sphere.transform.position, a.transform.position).CompareTo(Vector3.Distance(sphere.transform.position, b.transform.position));
       });
 
         foreach (Transform point in spawnPoints)
             Debug.Log(point.name);
     }
 
 }


This method also seems to work. Taken from http://answers.unity3d.com/questions/246781/sort-transforms-by-distance-to-player.html If anyone has the same problem.

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