title: What is an example of drawing custom nodes with vertices in swift SceneKit?
body: <p>This area is hardly documented online and it would be great to see a working Swift 3 example, of say, a custom drawn cube with manual SCNvector3s. There is this in objective-C but not Swift. This might not be a usual form of question but I know it would help many. If there is somewhere I missed, please mention.</p>
  
  <p>The documentation is not very helpful </p>
  
  <p>scngeometrysource, etc.</p>
  
  <p>Thanks </p>