title: Detecting Wall Collision
body: <p>In my game, I have multiple zombies and a player. I have imported city (created using osm in blender) in to my scene.</p>
  
  <p>Now i want, My Zombies should detect the wall collision (If happened with them) and should move towards to the player.</p>
  
  <p>I have used <code>transform.LookAt(target);</code> so that the Zombies should look for him unless die/destroyed. </p>
  
  <p>I have tagged the wall as 'wall' and detecting the wall collision/trigger with zombies, so that i should not cross in between the walls, and OnTriggerEnter , gameObject is rotating at 90. </p>
  
  <p>Now the problem is when the Zombie touch the wall, collision/trigger happens and Zombie rotate @ 90 and starts moving, but it keeps on moving.. I want once the wall end, he should again start moving towards Player..</p>
  
  <p>Any Logical idea or a script please.</p>