Not able to Rotate my 3D objects - rotation

Question

I had created one project using ARKit and SceneKit framework. In which I am working with file extension .dae, the files are locally available in my project as shown in below screenshot.
Here I had applied many gestures on this virtual object such as Tap Gesture(When I tap on camera screen, it places the virtual object there), same way Pinch Gesture and Pan Gesture. All of these gestures are working perfectly fine. Now I wanted to apply rotation gesture, for which I got stuck how to do that, also I am not getting any such available sources to achieve this.
Below is my working code so far,
import UIKit
import SceneKit
import ARKit
class ViewController: UIViewController, ARSCNViewDelegate {
#IBOutlet var sceneView: ARSCNView!
private var movedObject: SCNNode?
private var hud :MBProgressHUD!
override func viewDidLoad() {
super.viewDidLoad()
self.sceneView.autoenablesDefaultLighting = true
sceneView.delegate = self
sceneView.showsStatistics = true
let scene = SCNScene()
sceneView.scene = scene
registerGestureRecognizers()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// Create a session configuration
let configuration = ARWorldTrackingConfiguration()
configuration.planeDetection = .horizontal
// Run the view's session
sceneView.session.run(configuration)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
// Pause the view's session
sceneView.session.pause()
}
private func registerGestureRecognizers() {
let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(tapped(recognizer:)))
tapGestureRecognizer.numberOfTapsRequired = 1
self.sceneView.addGestureRecognizer(tapGestureRecognizer)
let pinchGestureRecognizer = UIPinchGestureRecognizer(target: self, action: #selector(pinched(recognizer:)))
self.sceneView.addGestureRecognizer(pinchGestureRecognizer)
let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(moveObject(recognizer:)))
panGestureRecognizer.maximumNumberOfTouches = 1
panGestureRecognizer.minimumNumberOfTouches = 1
self.sceneView.addGestureRecognizer(panGestureRecognizer)
let rotationGestureRecognizer = UIRotationGestureRecognizer(target: self, action: #selector(rotateObject(recognizer:)))
self.sceneView.addGestureRecognizer(rotationGestureRecognizer)
}
#objc func pinched(recognizer :UIPinchGestureRecognizer) {
if recognizer.state == .changed {
guard let sceneView = recognizer.view as? ARSCNView else {
return
}
let touch = recognizer.location(in: sceneView)
let hitTestResults = self.sceneView.hitTest(touch, options: nil)
if let hitTest = hitTestResults.first {
let chairNode = hitTest.node
let pinchScaleX = Float(recognizer.scale) * chairNode.scale.x
let pinchScaleY = Float(recognizer.scale) * chairNode.scale.y
let pinchScaleZ = Float(recognizer.scale) * chairNode.scale.z
chairNode.scale = SCNVector3(pinchScaleX,pinchScaleY,pinchScaleZ)
recognizer.scale = 1
}
}
}
#objc func moveObject(recognizer: UIPanGestureRecognizer) {
print("Move object")
if recognizer.state == .began {
print("Pan state began")
let tapPoint: CGPoint? = recognizer.location(in: sceneView)
let result = sceneView.hitTest(tapPoint ?? CGPoint.zero, options: nil)
if result.count == 0 {
return
}
let hitResult: SCNHitTestResult? = result.first
if (hitResult?.node.name == "free_car_1") {
movedObject = hitResult?.node
} else if (hitResult?.node.parent?.name == "free_car_1") {
movedObject = hitResult?.node.parent
}
if (movedObject != nil) {
print("Holding an Object")
}
}
if recognizer.state == .changed {
print("Pan State Changed")
if (movedObject != nil) {
let tapPoint: CGPoint? = recognizer.location(in: sceneView)
let hitResults = sceneView.hitTest(tapPoint ?? CGPoint.zero, types: .featurePoint)
let result: ARHitTestResult? = hitResults.last
let matrix: SCNMatrix4 = SCNMatrix4((result?.worldTransform)!)
//SCNMatrix4FromMat4((result?.worldTransform)!)
let vector: SCNVector3 = SCNVector3Make(matrix.m41, matrix.m42, matrix.m43)
movedObject?.position = vector
print("Moving object position")
}
}
if recognizer.state == .ended {
print("Done moving object homeie")
movedObject = nil
}
}
#objc func tapped(recognizer :UITapGestureRecognizer) {
guard let sceneView = recognizer.view as? ARSCNView else {
return
}
let touch = recognizer.location(in: sceneView)
let hitTestResults = sceneView.hitTest(touch)
guard let hitTest = hitTestResults.first?.node else {
let hitTestResultsWithExistingPlane = sceneView.hitTest(touch, types: .existingPlane)
let chairScene = SCNScene(named: "ShelbyWD.dae")!
guard let chairNode = chairScene.rootNode.childNode(withName: "ShelbyWD", recursively: true) else {
return
}
if let hitTestAvailable = hitTestResultsWithExistingPlane.first {
chairNode.position = SCNVector3(hitTestAvailable.worldTransform.columns.3.x,hitTestAvailable.worldTransform.columns.3.y,hitTestAvailable.worldTransform.columns.3.z)
self.sceneView.scene.rootNode.addChildNode(chairNode)
return
}
return
}
hitTest.removeFromParentNode()
}
#objc func rotateObject(recognizer :UIRotationGestureRecognizer)
{
}
}
Can anyone help me out to apply rotation gesture on my object?
Thank you!

Answer 1

In order to rotate an SCNNode, the 1st thing you need to do, is create a variable to store the rotationAngle around the YAxis or any other that you wish to perform the rotation on e.g:
var currentAngleY: Float = 0.0
Then have some way to have detected to node you wish to rotate, which in my example I am calling currentNode e.g.
var currentNode: SCNNode!
In my example I will just rotate around the YAxis.
You can use a UIPanGestureRecognizer like so:
/// Rotates An Object On It's YAxis
///
/// - Parameter gesture: UIPanGestureRecognizer
#objc func rotateObject(_ gesture: UIPanGestureRecognizer) {
guard let nodeToRotate = currentNode else { return }
let translation = gesture.translation(in: gesture.view!)
var newAngleY = (Float)(translation.x)*(Float)(Double.pi)/180.0
newAngleY += currentAngleY
nodeToRotate.eulerAngles.y = newAngleY
if(gesture.state == .ended) { currentAngleY = newAngleY }
print(nodeToRotate.eulerAngles)
}
Or if you wish to use a UIRotationGesture you can do something like this:
/// Rotates An SCNNode Around It's YAxis
///
/// - Parameter gesture: UIRotationGestureRecognizer
#objc func rotateNode(_ gesture: UIRotationGestureRecognizer){
//1. Get The Current Rotation From The Gesture
let rotation = Float(gesture.rotation)
//2. If The Gesture State Has Changed Set The Nodes EulerAngles.y
if gesture.state == .changed{
isRotating = true
currentNode.eulerAngles.y = currentAngleY + rotation
}
//3. If The Gesture Has Ended Store The Last Angle Of The Cube
if(gesture.state == .ended) {
currentAngleY = currentNode.eulerAngles.y
isRotating = false
}
}
Hope it helps...