Как сделать так, чтобы одна фишка обнаруживала другую в сцене при пороговом значении расстояния?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class ShipDistance : MonoBehaviour
{
    public Vector3 previousShipPosition;
    public Vector3 newShipPosition;
    public double distanceX;
    public double newdistanceX;
    public double newdistanceZ;
    public double distanceZ;
    public double shipSpeed;
    public double shipWay;
    public double newShipWay;
    
    // Start is called before the first frame update
    void Start()
    {
       
    }
 
    // Update is called once per frame
    void Update()
    {
        distanceX = newShipPosition.x - previousShipPosition.x;
        distanceZ = newShipPosition.z - previousShipPosition.z;
        if (distanceX < 0) { newdistanceX = distanceX * -1; }
        if (distanceX > 0) { newdistanceX = distanceX; }
        if (distanceZ < 0) { newdistanceZ = distanceZ * -1; }
        if (distanceZ > 0) { newdistanceZ = distanceZ; }
 
        shipSpeed = Mathf.Sqrt(Mathf.Pow(newdistanceX, 2) + Mathf.Pow(newdistanceZ, 2));
        shipWay = shipSpeed;
 
        newShipWay = shipWay + shipSpeed; 
        
        previousShipPosition = transform.position;
  
    }
    void LateUpdate()
    {
        newShipPosition = transform.position;
       
    }
}

public class ShipDistance : MonoBehaviour
{
    public float distance = 0.0f;
    public float speedMove = 0.0f;
 
    Vector3 prevPosition = Vector3.zero;
 
    void Start()
    {
        prevPosition = transform.position;
    }
 
    void Update()
    {
        float delta = (transform.position - prevPosition).magnitude;
 
        prevPosition = transform.position;
 
        distance += delta;
 
        speedMove = delta / Time.deltaTime;
    }
}