Question

此类也会渲染我的SCN文件。

import UIKit
import ARKit

class SimpleViewController: UIViewController {

    @IBOutlet var sceneView: ARSCNView!

    override func viewDidLoad() {
        super.viewDidLoad()        
        sceneView.scene = SCNScene(named: "duck.scn", inDirectory: "models.scnassets/furniture")!
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        sceneView.session.run(ARWorldTrackingConfiguration())
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        sceneView.session.pause()
    }
}

但我知道如何旋转或缩放我的对象（duck.scn）文件。我想用户可以与我的对象进行交互。

Answer 1

如果您想缩放SCNNode，可以执行以下操作：

/// Scales An SCNNode
///
/// - Parameter gesture: UIPinchGestureRecognizer
@objc func scaleObject(gesture: UIPinchGestureRecognizer) {

    guard let nodeToScale = currentNode else { return }
    if gesture.state == .changed {

        let pinchScaleX: CGFloat = gesture.scale * CGFloat((nodeToScale.scale.x))
        let pinchScaleY: CGFloat = gesture.scale * CGFloat((nodeToScale.scale.y))
        let pinchScaleZ: CGFloat = gesture.scale * CGFloat((nodeToScale.scale.z))
        nodeToScale.scale = SCNVector3Make(Float(pinchScaleX), Float(pinchScaleY), Float(pinchScaleZ))
        gesture.scale = 1

    }
    if gesture.state == .ended { }

}

由此当前节点引用SCNNode。

如果您想移动SCNNode，可以执行以下操作：

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {

    //1. Get The Current Touch Point
    guard let currentTouchPoint = touches.first?.location(in: self.augmentedRealityView),
        //2. Get The Next Feature Point Etc
        let hitTest = augmentedRealityView.hitTest(currentTouchPoint, types: .existingPlane).first else { return }

    //3. Convert To World Coordinates
    let worldTransform = hitTest.worldTransform

    //4. Set The New Position
    let newPosition = SCNVector3(worldTransform.columns.3.x, worldTransform.columns.3.y, worldTransform.columns.3.z)

    //5. Apply To The Node
    currentNode.simdPosition = float3(newPosition.x, newPosition.y, newPosition.z)

}

如果您想旋转SCNNode，首先应创建一个变量来存储原始角度，例如：

//Store The Rotation Of The CurrentNode
var currentAngleY: Float = 0.0

然后你可以这样做：

/// 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{

        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

    }
}

如果您想直接与SCNScene交互（虽然我不相信ARKit），您可以使用以下方法：

var allowsCameraControl: Bool { get set }

因此：

如果将此属性设置为true，则SceneKit会创建一个摄像机节点处理鼠标或触摸事件以允许用户平移，缩放和旋转他们的场景视图。（启用用户摄像头控制不会修改场景图或节点中已存在的摄像机对象包含它们。）

因此，一个例子是：

 sceneView.scene = SCNScene(named: "duck.scn", inDirectory: "models.scnassets/furniture")!
 sceneView.allowsCameraControl = true;

如何在AR工具包中旋转或缩放3D模型scn文件

1 个答案: