title: Creating custom shapes from primitives
body: <p>I'm trying to create a custom Physics shape with combining primitive shapes. The goal is to create a rounded cube. The appropriate method seems to be <strong>init(shapes:transforms:)</strong> which I found here <a href="https://developer.apple.com/library/prerelease/ios/documentation/SceneKit/Reference/SCNPhysicsShape_Class/index.html#//apple_ref/occ/clm/SCNPhysicsShape/shapeWithShapes:transforms" rel="nofollow">https://developer.apple.com/library/prerelease/ios/documentation/SceneKit/Reference/SCNPhysicsShape_Class/index.html#//apple_ref/occ/clm/SCNPhysicsShape/shapeWithShapes:transforms</a>:</p>
  
  <p>I'm thinking this could be done with 8 spheres, 12 cylinders and a box in the middle. Can anyone provide an example of doing that?</p>