使用手势旋转和缩放ARKit模型可以通过以下步骤实现:
touchesBegan
、touchesMoved
和touchesEnded
来处理手势操作。touchesBegan
方法中,记录手指触摸的起始位置。touchesMoved
方法中,计算手指移动的距离,并根据距离旋转和缩放模型。touchesEnded
方法中,重置起始位置和缩放比例。以下是一个示例代码,演示如何使用手势旋转和缩放ARKit模型:
import UIKit
import ARKit
class ViewController: UIViewController, ARSCNViewDelegate {
@IBOutlet var sceneView: ARSCNView!
var startScale: CGFloat = 1.0
var currentScale: CGFloat = 1.0
var startRotation: CGFloat = 0.0
var currentRotation: CGFloat = 0.0
override func viewDidLoad() {
super.viewDidLoad()
let scene = SCNScene()
sceneView.scene = scene
sceneView.delegate = self
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleTap(_:)))
sceneView.addGestureRecognizer(tapGesture)
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
let configuration = ARWorldTrackingConfiguration()
sceneView.session.run(configuration)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
sceneView.session.pause()
}
@objc func handleTap(_ gesture: UITapGestureRecognizer) {
let location = gesture.location(in: sceneView)
let hitTestResults = sceneView.hitTest(location, options: nil)
if let hitResult = hitTestResults.first {
let node = hitResult.node
node.scale = SCNVector3(x: startScale, y: startScale, z: startScale)
node.rotation = SCNVector4(x: 0, y: 0, z: 0, w: startRotation)
}
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
if let touch = touches.first {
let location = touch.location(in: sceneView)
let hitTestResults = sceneView.hitTest(location, options: nil)
if let hitResult = hitTestResults.first {
let node = hitResult.node
startScale = node.scale.x
startRotation = node.rotation.w
}
}
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
if let touch = touches.first {
let location = touch.location(in: sceneView)
let previousLocation = touch.previousLocation(in: sceneView)
let deltaX = location.x - previousLocation.x
let deltaY = location.y - previousLocation.y
currentScale += deltaY * 0.01
currentRotation += deltaX * (CGFloat.pi / 180)
if let node = sceneView.scene.rootNode.childNode(withName: "model", recursively: true) {
node.scale = SCNVector3(x: currentScale, y: currentScale, z: currentScale)
node.rotation = SCNVector4(x: 0, y: 1, z: 0, w: currentRotation)
}
}
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
startScale = currentScale
startRotation = currentRotation
}
}
这个示例代码使用ARKit框架创建了一个AR视图,并添加了一个点击手势识别器。在点击手势的处理方法中,通过射线检测找到被点击的模型节点,并将其缩放和旋转重置为起始状态。
在touchesBegan
方法中,记录了手指触摸的起始位置,并获取被点击模型节点的初始缩放比例和旋转角度。
在touchesMoved
方法中,根据手指移动的距离计算缩放比例和旋转角度的增量,并将其应用到模型节点上实现旋转和缩放效果。
在touchesEnded
方法中,更新起始缩放比例和旋转角度,以便下次手势操作时能够从当前状态继续。
请注意,这只是一个简单的示例代码,实际使用中可能需要根据具体需求进行适当修改和扩展。另外,为了完整的实现手势旋转和缩放功能,还需要将模型加载到AR场景中,这部分代码在示例中未包含。
对于ARKit的更多详细信息和使用方法,您可以参考腾讯云的AR开发文档:AR开发文档。
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