List版本(適用數量較少)

    [SerializeField] List<Transform> npcList;//儲存不同npc
    [SerializeField] float interactRange;
    float dist;
    private void Start()
    {
         dist = 0f;
    }
    private void Update()
    {
        if (Keyboard.current.eKey.wasPressedThisFrame)
        {
            dist = Vector3.Distance(transform.position, npcList[0].transform.position);//Vector3.Distance(disA,disB) 計算兩者距離用
            print("Distance to other: " + dist);

            if (dist < interactRange)
            {
                Debug.Log("hi:");
            }
        }
    }

-----------------------------------------------------------
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Unity官方StarterAsset-First Person Character Controller的sdk

using UnityEngine;
#if ENABLE_INPUT_SYSTEM
using UnityEngine.InputSystem;
#endif

namespace StarterAssets
{
	public class StarterAssetsInputs : MonoBehaviour
	{
		[Header("Character Input Values")]
		public Vector2 move;
		public Vector2 look;
		public bool jump;
		public bool sprint;
		public bool interact;

		[Header("Movement Settings")]
		public bool analogMovement;

		[Header("Mouse Cursor Settings")]
		public bool cursorLocked = true;
		public bool cursorInputForLook = true;

#if ENABLE_INPUT_SYSTEM
		public void OnMove(InputValue value)
		{
			MoveInput(value.Get<Vector2>());
		}

		public void OnLook(InputValue value)
		{
			if(cursorInputForLook)
			{
				LookInput(value.Get<Vector2>());
			}
		}

		public void OnJump(InputValue value)
		{
			JumpInput(value.isPressed);
		}

		public void OnSprint(InputValue value)
		{
			SprintInput(value.isPressed);
		}

		//Interact
		public void OnInteract(InputValue value)
		{
			InteractInput(value.isPressed);

			Debug.Log("E");
		}
#endif


		public void MoveInput(Vector2 newMoveDirection)
		{
			move = newMoveDirection;
		} 

		public void LookInput(Vector2 newLookDirection)
		{
			look = newLookDirection;
		}

		public void JumpInput(bool newJumpState)
		{
			jump = newJumpState;
		}

		public void SprintInput(bool newSprintState)
		{
			sprint = newSprintState;
		}

        //Interact
        public void InteractInput(bool newInteractState)
		{
			interact = newInteractState;
		}
		private void OnApplicationFocus(bool hasFocus)
		{
			SetCursorState(cursorLocked);
		}

		private void SetCursorState(bool newState)
		{
			Cursor.lockState = newState ? CursorLockMode.Locked : CursorLockMode.None;
		}
	}
	
}

事件綁定互動

using StarterAssets;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.InputSystem;
using static UnityEngine.Rendering.DebugUI;

public class PlayerInteraction : MonoBehaviour
{
    [SerializeField] List<Transform> npcList;
    [SerializeField] float interactRange;
    float dist;
    private StarterAssetsInputs starterAssetsInputs;// script


    private void Start()
    {
        dist = 0f;
        starterAssetsInputs = GetComponent<StarterAssetsInputs>();
    }

    private void Update()
    {     
        Interact();
    }
    private void Interact()//Interact action
    {
       dist = Vector3.Distance(transform.position, npcList[0].transform.position);
        if (dist < interactRange && starterAssetsInputs != null && starterAssetsInputs.interact)
        {
            print("Distance to other: " + dist);
            Debug.Log("hi:");
            //互動寫在這裡
        }

    }
}

事件綁定互動但用phisic system判定。

(Event條件調用沒有寫好,應該要能直接調用Interact()而不是寫成需要Getcomponment的布林判斷式,不須存取input的互動物件會沒辦法觸發)

using StarterAssets;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.InputSystem;
using static UnityEngine.Rendering.DebugUI;

public class PlayerInteraction : MonoBehaviour
{
   
    [SerializeField] float interactRange;
    private StarterAssetsInputs starterAssetsInputs;// script


     void Awake()
     {
        interactRange = 2f;
     }

    void Start()
    {      
        starterAssetsInputs = GetComponent<StarterAssetsInputs>();//event input script
    }

   void Update()
    {     
        Interact();
    }
     void Interact()//Interact action
     {
     
        if (starterAssetsInputs != null && starterAssetsInputs.interact)
        {
            print("Distance to other: ");
            //區域內物理偵測到的,與先宣告list相同
            Collider [ ]colliderArray=  Physics.OverlapSphere(transform.position, interactRange);//(center, radius,mask)
            foreach(Collider collider in colliderArray)
            {
                Debug.Log(collider);
            }
         
            //互動寫在這裡
        }

    }
}