An introduction to SceneKit
SceneKit is a framework that can be used to implement the features of 3D graphic components into our iOS games. SceneKit provides a facility for integrating a high performance rendering engine at a greater level. It also offers a facility for importing, manipulating, and rendering 3D graphic assets.
It is fairly easy in iOS 8, to integrate SceneKit elements in a Sprite Kit game. First of all, you just have to import the SceneKit framework in the required Sprite Kit class. Then, you are all set to access all the methods and properties of SceneKit.