title: Swift 3 Beginner - Position Assets in Scene
body: <p>I am a complete beginner at Swift 3 and programming in general so this will be an incredibly basic question.</p>
  
  <p>I have been following tutorials and am currently positioning a SpriteNode using CGPoint. The tutorial recommends the following to position the Node centrally at the bottom of the screen:</p>
  
  <pre><code>Ground.position = CGPoint(x: self.frame.width / 2, y: 0)
  </code></pre>
  
  <p>However, that causes it to stick to the top-right of the screen.</p>
  
  <p>When I use the following code:</p>
  
  <pre><code>Ground.position = CGPoint(x: 0 - self.frame.width / 2, y: 0 - self.frame.height / 2)
  </code></pre>
  
  <p>It positions at the bottom-centre as intended.</p>
  
  <p>I do not understand why this happens as there is very little else done in the tutorial at this point to cause the error.</p>