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我在检测 ARKit 中的水平面和垂直面时遇到问题。到目前为止，我已经成功地能够在一定程度上检测到水平面，但也希望将其与对垂直面的支持结合起来。

我的目标是创建一个 AR 项目，该项目有一个可以从地板和墙壁反弹的球。如果没有垂直平面检测，球会弹到远处，直到再也看不见。

我的水平面检测如下。

public func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
    guard let planeAnchor = anchor as? ARPlaneAnchor else { return }
    let width = CGFloat(planeAnchor.extent.x)
    let height = CGFloat(planeAnchor.extent.z)
    let plane = SCNPlane(width: width, height: height)
    plane.materials.first?.diffuse.contents = UIColor.init(white: 1, alpha: 1)
    let planeNode = SCNNode(geometry: plane)
    let x = CGFloat(planeAnchor.center.x)
    let y = CGFloat(planeAnchor.center.y)
    let z = CGFloat(planeAnchor.center.z)
    planeNode.position = SCNVector3(x,y,z)
    planeNode.eulerAngles.x = -.pi / 2
    scene.rootNode.addChildNode(planeNode)
    let box = SCNBox(width: CGFloat(planeAnchor.extent.x), height: CGFloat(planeAnchor.extent.z), length: CGFloat(planeAnchor.extent.y), chamferRadius: 0)
    planeNode.physicsBody = SCNPhysicsBody(type: .static, shape: SCNPhysicsShape(geometry: box, options: nil))
}

如何在 ARKit 或 RealityKit 项目中同时拥有水平面和垂直面？

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1 回答 1

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您可以像往常一样使用以下代码：

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    let configuration = ARWorldTrackingConfiguration()
    configuration.planeDetection = [.horizontal, .vertical]
    arView.session.run(configuration)
}

planeDetection实例属性是可获取和可设置的：

var planeDetection: ARWorldTrackingConfiguration.PlaneDetection { get set }

...并且struct符合OptionSet协议，该协议允许您仅使用一个值或同时使用两个值：PlaneDetection 

configuration.planeDetection = []
configuration.planeDetection = .vertical
configuration.planeDetection = [.horizontal, .vertical]

然后将renderer(_:didAdd:for:)实例方法添加到您的代码中，如下所示：

func renderer(_ renderer: SCNSceneRenderer,
             didAdd node: SCNNode,
              for anchor: ARAnchor) {

    guard let planeAnchor = anchor as? ARPlaneAnchor 
    else { return }

    let width = CGFloat(planeAnchor.extent.x)
    let height = CGFloat(planeAnchor.extent.z)
    let myPlane = SCNPlane(width: width, height: height)           

    if planeAnchor.alignment == .horizontal {
        myPlane.materials.first?.diffuse.contents = UIColor.semiOpaqueRed
    } else if planeAnchor.alignment == .vertical {
        myPlane.materials.first?.diffuse.contents = UIColor.semiOpaqueCyan
    }

    let planeNode = SCNNode(geometry: myPlane)
    let x = CGFloat(planeAnchor.center.x)
    let y = CGFloat(planeAnchor.center.y)
    let z = CGFloat(planeAnchor.center.z)

    planeNode.position = SCNVector3(x, y, z)
    planeNode.eulerAngles.x = -.pi / 2

    node.addChildNode(planeNode)
}

最后，添加可能如下所示的 renderer(_:didUpdate:for:)实例方法：

func renderer(_ renderer: SCNSceneRenderer,
          didUpdate node: SCNNode,
              for anchor: ARAnchor) {

    guard let planeAnchor = anchor as? ARPlaneAnchor,
          let planeNode = node.childNodes.first,
          let myPlane = planeNode.geometry as? SCNPlane
    else { return }

    let width = CGFloat(planeAnchor.extent.x)
    let height = CGFloat(planeAnchor.extent.z)
    myPlane.width = width
    myPlane.height = height

    let x = CGFloat(planeAnchor.center.x)
    let y = CGFloat(planeAnchor.center.y)
    let z = CGFloat(planeAnchor.center.z)
    planeNode.position = SCNVector3(x, y, z)
}
于 2019-11-20T07:01:12.290 回答