title: How can i make in blender a hollow cylinder but only from inside with a door as object for unity3d?
body: <p>I did this simple tutorial and it's making a cylinder hollow.
  But i don't want it to be open from top and bottom i want it only to be hollow inside but to keep the cylinder closed.</p>
  
  <p>Then i want to cut some kind of square/door so i can walk in later in unity3d with my character. The question is how to keep the cylinder hollow without making it open on top and bottom ? How to cut/make a door ? And how to save it as gameobject or whatever it needed to be able to use it in unity3d ?</p>
  
  <p><a href="https://www.youtube.com/watch?v=qIOpgKswi58" rel="nofollow noreferrer">Cylinder hollow tutorial</a></p>