title: Unity OnMouseEnter() or OnMouseOver() not working
body: <p>I want to make an Inventory System in Unity, so I tried to follow <a href="https://www.youtube.com/watch?v=We1ab6yHrwI" rel="nofollow noreferrer">this tutorial</a>, but the functions <code>OnMouseEnter</code> and <code>OnMouseOver</code> are not working.</p>
  
  <p>I tried everything like 3d colliders with <code>z-value</code> of 100, with trigger and not trigger, and also I checked if the <code>Physics.queriesHitTriggers</code> is <code>true</code>, but nothing works. Do you have any easy tips?</p>
  
  <p>Not with raycasting... I'm quite new and don't understand this.</p>