unity's rays don't seem to detect objects

unity's ray does not seem to detect objects
I want to connect the 20 points: if there is no obstacle between them, connect them; Obstacles do not connect
All nodes and obstacles have rigidbody and collider components
but some connections fail to cross obstacles.

< div class = "aw - list - img > unity的射线似乎没有检测到物体

< br / > after the operation effect:

My code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;

public class CGtest : MonoBehaviour
{
    void Start()
    {
        for (int i = 1; i <= 19; i++)
        {
            for (int j = i + 1; j <= 20; j++)
            {
                Ray ray = new Ray(GameObject.Find("node" + i).transform.position, GameObject.Find("node" + j).transform.position);              
                RaycastHit hit;
                Physics.Raycast(ray, out hit, 100);
                if (hit.transform == null)
                {
                    Debug.DrawLine(GameObject.Find("node" + i).transform.position, GameObject.Find("node" + j).transform.position, Color.red, 1000);
                }
               
            }
        }
        
    }
    
   
}