ARKit

Question

在iOS14,hitTest(_:types:) was deprecated. It seems that you are supposed to use raycastQuery(from:allowing:alignment:) now. From the documentation:

Raycasting is the preferred method for finding positions on surfaces in the real-world environment, but the hit-testing functions remain present for compatibility. With tracked raycasting, ARKit continues to refine the results to increase the position accuracy of virtual content you place with a raycast.

但是，如何使用光线投射命中测试 SCNNodes？我只看到命中测试飞机的选项。

`raycastQuery` method documentation	Only choices for `allowing:` are planes

这是我当前的代码，它使用 hit-testing 检测立方体节点上的点击并将其变为蓝色。

class ViewController: UIViewController {

    @IBOutlet weak var sceneView: ARSCNView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        /// Run the configuration
        let worldTrackingConfiguration = ARWorldTrackingConfiguration()
        sceneView.session.run(worldTrackingConfiguration)
        
        /// Make the red cube
        let cube = SCNBox(width: 0.1, height: 0.1, length: 0.1, chamferRadius: 0)
        cube.materials.first?.diffuse.contents = UIColor.red
        
        let cubeNode = SCNNode(geometry: cube)
        cubeNode.position = SCNVector3(0, 0, -0.2) /// 20 cm in front of the camera
        cubeNode.name = "ColorCube"
        
        /// Add the node to the ARKit scene
        sceneView.scene.rootNode.addChildNode(cubeNode)
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesBegan(touches, with: event)
        guard let location = touches.first?.location(in: sceneView) else { return }
        
        let results = sceneView.hitTest(location, options: [SCNHitTestOption.searchMode : 1])
        for result in results.filter( { [=10=].node.name == "ColorCube" }) {  /// See if the beam hit the cube
            let cubeNode = result.node
            cubeNode.geometry?.firstMaterial?.diffuse.contents = UIColor.blue /// change to blue
        }
    }
}

如何用等效的 raycastQuery 代码替换 let results = sceneView.hitTest(location, options: [SCNHitTestOption.searchMode : 1])？

Answer 1

关于命中测试

官方文档说在iOS14中只有ARKit的hitTest(_:types:)实例方法被弃用了。但是在iOS15中你仍然可以使用它。 ARKit 的命中测试方法应该替换为光线投射方法。

已弃用的命中测试：

let results: [ARHitTestResult] = sceneView.hitTest(sceneView.center, 
                                           types: .existingPlaneUsingGeometry)

等效光线投射

let raycastQuery: ARRaycastQuery? = sceneView.raycastQuery(
                                                      from: sceneView.center, 
                                                  allowing: .estimatedPlane, 
                                                 alignment: .any)

let results: [ARRaycastResult] = sceneView.session.raycast(raycastQuery!)

如果您更喜欢光线投射方法来击中节点（实体），请使用 RealityKit 模块而不是 SceneKit：

let arView = ARView(frame: .zero)

let query: CollisionCastQueryType = .nearest
let mask: CollisionGroup = .default
    
let raycasts: [CollisionCastHit] = arView.scene.raycast(from: [0, 0, 0], 
                                                          to: [5, 6, 7],  
                                                       query: query, 
                                                        mask: mask, 
                                                  relativeTo: nil)
    
guard let raycast: CollisionCastHit = raycasts.first else { return }
    
print(raycast.entity.name)

P.S.

无需寻找 SceneKit 的 hitTest(_:options:) 实例方法返回 [SCNHitTestResult] 的替代方法，因为它运行良好，现在不是弃用它的时候。

ARKit – 使用 raycastQuery 而不是 hitTest 的 Tap 节点，后者已被弃用

ARKit – Tap node with raycastQuery instead of hitTest, which is deprecated

augmented-reality

scenekit

swift

realitykit

关于命中测试

等效光线投射