mesh board

ViewController.swift

import UIKit
import SceneKit;

class ViewController: UIViewController, SCNSceneRendererDelegate {

    weak var sceneView : SCNView?
    weak var meshboard : SCNNode?
    var demostart = false
    var lastupdate : NSTimeInterval = 0
    var boardMoveTo = SCNVector3(x: 1, y: 0, z: 0)
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupScene()
        createMeshBoard()
        createBucket()
    }

    func setupScene() {
        let sv = SCNView(frame: view.bounds)
        sv.scene = SCNScene()
        sv.backgroundColor = UIColor.brownColor()
        sv.allowsCameraControl = true
        sv.autoenablesDefaultLighting = true
        sv.delegate = self
        view.addSubview(sv)
        
        sceneView = sv
    }
    
    func createMeshBoard() {
        let board = SCNNode()
        board.name = "board"
        sceneView?.scene?.rootNode.addChildNode(board)
        for i in 0...10 {
            let barA = SCNBox(width: 9.5, height: 0.1, length: 0.1, chamferRadius: 0)
            barA.firstMaterial?.diffuse.contents = UIColor.lightGrayColor()
            let barANode = SCNNode(geometry: barA)
            barANode.position = SCNVector3(x: 0, y: 0, z: Float(i)-5)
            board.addChildNode(barANode)
            
            let barB = SCNBox(width: 0.1, height: 0.1, length: 9.5, chamferRadius: 0)
            barB.firstMaterial?.diffuse.contents = UIColor.lightGrayColor()
            let barBNode = SCNNode(geometry: barB)
            barBNode.position = SCNVector3(x: Float(i)-5, y: 0, z: 0)
            board.addChildNode(barBNode)
        }
        board.physicsBody = SCNPhysicsBody.dynamicBody()
        board.physicsBody?.velocityFactor = SCNVector3(x: 1, y: 0, z: 0)
        board.physicsBody?.angularVelocityFactor = SCNVector3Zero
        
        meshboard = board
    }
    
    func createBucket() {

        let color = UIColor(hue: 0.6, saturation: 1, brightness: 0.6, alpha: 1)
        
        let tube = SCNTube(innerRadius: 6, outerRadius: 6.2, height: 3)
        tube.firstMaterial?.diffuse.contents = color
        let tubeNode = SCNNode(geometry: tube)
        tubeNode.position = SCNVector3(x: 0, y: -4, z: 0)
        sceneView?.scene?.rootNode.addChildNode(tubeNode)
        tubeNode.physicsBody = SCNPhysicsBody.staticBody()
        tubeNode.physicsBody?.physicsShape = SCNPhysicsShape(node: tubeNode, options: [SCNPhysicsShapeTypeKey : SCNPhysicsShapeTypeConcavePolyhedron])
        
        let bottom = SCNCylinder(radius: 6.2, height: 0.2)
        bottom.firstMaterial?.diffuse.contents = color
        let bottomNode = SCNNode(geometry: bottom)
        bottomNode.position = SCNVector3(x: 0, y: -5, z: 0)
        sceneView?.scene?.rootNode.addChildNode(bottomNode)
        bottomNode.physicsBody = SCNPhysicsBody.staticBody()
    }
    
    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
        demostart = true
    }
    
    override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) {
        demostart = false
    }
    
    func renderer(aRenderer: SCNSceneRenderer, updateAtTime time: NSTimeInterval) {
        
        let interval = time - lastupdate
        if demostart && interval > 0.5 {
            self.lastupdate = time
            
            let r = CGFloat(arc4random() % 5) * 0.08 + 0.2
            let ball = SCNSphere(radius: r)
            let color = UIColor(hue: CGFloat(arc4random() % 5) * 0.1, saturation: 0.3, brightness: 1, alpha: 1)
            ball.firstMaterial?.diffuse.contents = color
            let ballNode = SCNNode(geometry: ball)
            ballNode.position = SCNVector3(x: 0, y: 4, z: 0.2)
            sceneView?.scene?.rootNode.addChildNode(ballNode)
            
            ballNode.physicsBody = SCNPhysicsBody.dynamicBody()
            ballNode.physicsBody?.mass = 0.01
            ballNode.physicsBody?.restitution = 0

        }
        
        if let board = meshboard {
            if self.boardMoveTo.x > 0 {
                board.physicsBody?.velocity = SCNVector3(x: 3, y: 0, z: 0)
            } else {
                board.physicsBody?.velocity = SCNVector3(x: -3, y: 0, z: 0)
            }
            
            let x = board.presentationNode().position.x
            if fabs(x) > 0.5 {
                board.position = SCNVector3(x: x > 0 ? 0.49 : -0.49 , y: 0, z: 0)
                board.physicsBody?.velocity = SCNVector3Zero
                self.boardMoveTo = SCNVector3(x: -self.boardMoveTo.x, y: 0, z: 0)
            }
        }
    }

}