Apple's SceneKit is for casual 3D gaming. It enables developers to render games in 3D with better 3D graphics, a separate physics engine, a particle generator, and quick object scripting.
SceneKit is integrated with SpriteKit, which allows developers to include SpriteKit assets in 3D games.
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Apple iOS 8 opens new areas of iOS and enables developers to extend the content and functionality of their applications. Developers can create customized experiences in the realms of photo editing, sharing, notifications, keyboard, documents, and actions. There are over 4,000 new APIs enabling new capabilities and features. Some of the major new APIs, which cover gaming, photo tools, health/fitness, the cloud, home automation, etc., include Metal, SceneKit, SpriteKit, CloudKit, HomeKit, HealthKit, Camera, PhotoKit, Swift, and TouchID.