backflip bot

ViewController.swift

//
//  ViewController.swift
//  BackflipBot
//
//  Created by Mizushima Yusuke on 9/13/15.
//  Copyright (c) 2015 Yusuke Mizusima. All rights reserved.
//

import UIKit
import SceneKit

class ViewController: UIViewController {

    weak var sceneView : SCNView?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupScene()
        createGround()
        createBot()
    }

    func setupScene() {
        let sv = SCNView(frame: view.bounds)
        sv.scene = SCNScene()
        sv.backgroundColor = UIColor(hue: 0.6, saturation: 0.1, brightness: 1, alpha: 1)
        sv.allowsCameraControl = true
        sv.autoenablesDefaultLighting = true
        view.addSubview(sv)
        
        sceneView = sv
    }
    
    func createGround() {
        let ground = SCNBox(width: 10, height: 1, length: 10, chamferRadius: 0)
        ground.firstMaterial?.diffuse.contents = UIColor.brownColor()
        let gNode = SCNNode(geometry: ground)
        gNode.position = SCNVector3(x: 0, y: -3, z: 0)
        sceneView?.scene?.rootNode.addChildNode(gNode)
    }
    
    func createBot() {
        let bot = SCNNode()
        bot.name = "bot"
        sceneView?.scene?.rootNode.addChildNode(bot)
        
        for i in 0...1 {
            let leg = SCNBox(width: 0.5, height: 5, length: 1, chamferRadius: 0)
            leg.firstMaterial?.diffuse.contents = UIColor.lightGrayColor()
            let lNode = SCNNode(geometry: leg)
            lNode.position = SCNVector3(x: (i==0) ? -2.4 : 2.4, y: 0, z: 0)
            bot.addChildNode(lNode)
            
            let foot = SCNBox(width: 1, height: 0.5, length: 3, chamferRadius: 0)
            foot.firstMaterial?.diffuse.contents = UIColor.lightGrayColor()
            let fNode = SCNNode(geometry: foot)
            fNode.position = SCNVector3(x: (i==0) ? -2.5 : 2.5, y: -2.5, z: 0)
            bot.addChildNode(fNode)
            
        }
        
        let body = SCNCylinder(radius: 2.1, height: 4)
        body.firstMaterial?.diffuse.contents = UIColor(white: 0.99, alpha: 1)
        body.firstMaterial?.specular.contents = UIColor.whiteColor()
        let bNode = SCNNode(geometry: body)
        bNode.name = "body"
        bNode.pivot = SCNMatrix4MakeTranslation(0, 2, 0)
        bNode.position = SCNVector3(x: 0, y: 2, z: 0)
        bot.addChildNode(bNode)
        
        let head = SCNSphere(radius: 2.1)
        head.firstMaterial?.diffuse.contents = UIColor.lightGrayColor()
        head.firstMaterial?.diffuse.contents = UIColor.whiteColor()
        let hNode = SCNNode(geometry: head)
        hNode.position = SCNVector3(x: 0, y: 2, z: 0)
        bNode.addChildNode(hNode)
        
        let ring = SCNCylinder(radius: 2.15, height: 0.3)
        ring.firstMaterial?.diffuse.contents = UIColor(hue: 0.6, saturation: 1, brightness: 0.5, alpha: 1)
        let rNode = SCNNode(geometry: ring)
        rNode.position = SCNVector3(x: 0, y: 2, z: 0)
        bNode.addChildNode(rNode)
    }

    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
        if let bot = sceneView?.scene?.rootNode.childNodeWithName("body", recursively: true) {
            bot.runAction(SCNAction.rotateByX(-2.0 * CGFloat(M_PI), y: 0, z: 0, duration: 3.0))
        }
    }
}

http://lepetit-prince.net/ios/?p=4347