Question by MichaelABC · Feb 14 at 07:07 PM · raycast list enum linecast linq

Add only one Raycast/Linecast hit to a list

I have made this script so that with the mouse I can "select" the Spriterenderer of these gameobjects I call "molecules" and change them. To select them and unselect them I add them and remove them from a list. I need to use a Linecast because the idea is that even if I don't click exactly on them, but I have the mouse in their vicinity I can select them.

NOTE: I am using some Linq

     using System;
     using System.Collections.Generic;
     using System.Linq;
     using UnityEngine;
      
     public class CursorXhair : MonoBehaviour
     {
         public Sprite newSprite;
         public Sprite originalSprite;
         List<SpriteRenderer> collidingObjects = new List<SpriteRenderer>();
      
         void Update()
         {
             Vector2 playerPos = Player.transform.position;
             Vector2 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             Vector2 direction = mousePos - playerPos;
      
             transform.position = mousePos;
      
             Debug.DrawRay(playerPos, direction);
             var hitObjects = Physics2D.Linecast(mousePos, playerPos);
      
             if (hitObjects.collider != null && hitObjects.collider.tag == "Int_Molecule")
             {
                 Debug.Log("hitObjects is colliding");
                 hitObjects.collider.GetComponent<SpriteRenderer>().sprite = newSprite;
                 collidingObjects.Add(hitObjects.collider.GetComponent<SpriteRenderer>());
      
             }
             else if (collidingObjects.Count >= 1 && hitObjects.collider.tag == "Player")
             {
                 Debug.Log("hitObjects is not colliding");
                 collidingObjects.Last().GetComponent<SpriteRenderer>().sprite = originalSprite;
                 collidingObjects.RemoveAt(collidingObjects.Count - 1);
             }
      
         }
     }

It works well, however I want only one molecule to be selected at a time. This seems not possible because the first if condition keeps being satisfied in these example:

alt text

As I am struggling for a solution I thought that maybe I need a way to distinguish the first and second hit molecules, so that only one is returned and changed, but how?

I was thinking, some possibilities: