RealityKit 的“.allowsCameraControl”工具用于构建“nonAR”应用程序

Question

RealityKit 有相机选项.nonAR，但缺乏构建 3D 非 AR 应用程序的基本选项，例如相机控制 ( .allowsCameraComtrol)。

使用 RealityKit 替代 SceneKit 是否可行（过去几年没有更新，可能很快就会被亵渎）？

Answer 1

.allowsCameraControl相等的

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苹果一直在准备 SceneKit 的替代品，它绝对是 Reality 系列 \xe2\x80\x93 RealityKit、RealityFoundation、Reality Composer (iOS/macOS)、Reality Composer Pro（而不是visionOS）、Reality Converter、ARQuickLook、等。使用RealityKit 2.0，您可以创建AR和VR应用程序。作为制作 3D 场景原型的工具，您需要使用 Reality Composer。尽管缺少像 一样重要的功能.allowsCameraControl，您现在仍然可以使用 RealityKit 制作 VR 应用程序。

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解决方法

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尽管如此，请使用我的代码作为起点，在 RealityKit 中为 VR 创建您自己的相机控件：

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import UIKit\nimport RealityKit\n\nclass ViewController: UIViewController {\n    @IBOutlet var arView: ARView!\n    let buildings = try! Experience.loadScene()\n    let camera = PerspectiveCamera()\n    var current_X_Angle: Float = 0.0\n    var current_Y_Angle: Float = 0.0\n\n    override func viewDidLoad() {\n        super.viewDidLoad()\n        arView.environment.background = .color(.systemCyan)\n        arView.scene.anchors.append(buildings)\n        self.camera.position.z = 1\n        buildings.children[0].addChild(self.camera)\n        self.gestureRecognizer()\n    }\n    func gestureRecognizer() {\n        for gestureRecognizer in [UIPanGestureRecognizer.self,\n                                  UIPinchGestureRecognizer.self] {\n            if gestureRecognizer == UIPinchGestureRecognizer.self {\n                let r = UIPinchGestureRecognizer(target: self,\n                               action: #selector(allowCameraControl_01))\n                arView.addGestureRecognizer(r)\n            }\n            if gestureRecognizer == UIPanGestureRecognizer.self {\n                let r = UIPanGestureRecognizer(target: self,\n                               action: #selector(allowCameraControl_02))\n                arView.addGestureRecognizer(r)\n            }\n        }\n    }\n    @objc func allowCameraControl_01(recognizer: UIPinchGestureRecognizer) {\n        switch recognizer.state {\n            case .changed, .ended:\n                self.camera.position.z *= 1 / Float(recognizer.scale)\n                recognizer.scale = 1.0\n            default: break\n        }\n    }\n    @objc func allowCameraControl_02(recognizer: UIPanGestureRecognizer) {\n        switch recognizer.state {\n            case .changed, .ended:\n                let translate = recognizer.translation(in: recognizer.view)\n                let angle_X = Float(translate.y / 300) * .pi / 180.0\n                let angle_Y = Float(translate.x / 100) * .pi / 180.0\n                self.current_X_Angle += angle_X\n                self.current_Y_Angle += angle_Y                \n                camera.setOrientation(Transform(pitch: current_X_Angle,\n                                                  yaw: current_Y_Angle,\n                                                 roll: .zero).rotation,\n                                      relativeTo: buildings.anchor)\n            default: break\n        }\n    }\n}\n

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在这里您可以找到SwiftUI 版本。

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VisionOS Xcode 模拟器

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在 Xcode 15 的 VisionOS 模拟器中，右下角有Pan、Orbit和UI 按钮。Dolly

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