title: collision not triggered when i touch object
body: <p>I have 1 First Person Controller as a player and created 1 cube as an enemy.</p>
  
  <p>Enemy has rigidbody to assign gravity to it and it moving on 1 platform which is made from cube.</p>
  
  <p>collision detect script is attached with enemy. <strong>when enemy touches the player method triggered successfully. but when Player touch enemy method is not called.</strong></p>
  
  <pre><code>void OnCollisionEnter(Collision collision) {
  
         Collider other=collision.collider;
         Debug.Log(string.Format("OnCollisionEnter tag={0}",other.tag));
           //                   
  
         if(other.gameObject.tag=="Player")
         {
           Debug.Log("Player1 Touched");
         }
  }
  </code></pre>