/*

     Copyright (C) 2016 Apple Inc. All Rights Reserved.

     See LICENSE.txt for this sample’s licensing information

     Abstract:

     An extension on CAAnimation used to load animations from an SCNScene.

 */

import SceneKit

// MARK: Core Animation

extension CAAnimation {

    class func animation(withSceneName name: String) -> CAAnimation {

        guard let scene = SCNScene(named: name) else {

            fatalError("Failed to find scene with name \(name).")

        }

        var animation: CAAnimation?

        scene.rootNode.enumerateChildNodes { (child, stop) in

            guard let firstKey = child.animationKeys.first else { return }

            animation = child.animation(forKey: firstKey)

            stop.initialize(to: true)

        }

        guard let foundAnimation = animation else {

            fatalError("Failed to find animation named \(name).")

        }

        foundAnimation.fadeInDuration = 0.3

        foundAnimation.fadeOutDuration = 0.3

        foundAnimation.repeatCount = 1

        return foundAnimation

    }

}