Swift 阿基特&x2013；与真实世界对象的碰撞

我需要使用ARKit检测虚拟对象何时与真实世界对象接触

---

有什么方法可以找到它吗？

首先，您需要创建一个符合

OptionSet

协议并具有位集类型属性的冲突类别结构：

import ARKit

struct Category: OptionSet {

    let rawValue: Int
    
    static let sphereCategory = Category(rawValue: 1 << 0)
    static let targetCategory = Category(rawValue: 1 << 1)
}

SCNPhysicsContactDelegate

包含3个可选的physicsWorld（）方法（稍后我们将使用第1个）：

在此之后，为球体碰撞器定义

categoryBitMask

和

collisionBitMask

：

fileprivate func createSphere() -> SCNNode {

    var sphere = SCNNode()
    sphere.geometry = SCNSphere(radius: 0.1)

    sphere.physicsBody = SCNPhysicsBody(type: .dynamic, shape: nil)
    sphere.physicsBody?.isAffectedByGravity = true

    sphere.physicsBody?.categoryBitMask = Category.sphereCategory.rawValue
    sphere.physicsBody?.collisionBitMask = Category.targetCategory.rawValue

    return sphere
}

…并按与实际检测平面相反的顺序定义位掩码：

fileprivate func visualizeDetectedPlane() -> SCNNode {

    var plane = SCNNode()
    plane.geometry = SCNPlane(width: 0.7, height: 0.7)

    plane.physicsBody = SCNPhysicsBody(type: .dynamic, shape: nil)
    plane.physicsBody?.isAffectedByGravity = false

    plane.physicsBody?.categoryBitMask = Category.targetCategory.rawValue
    plane.physicsBody?.collisionBitMask = Category.sphereCategory.rawValue

    return plane
}

只有在将SCN平面添加到实际检测平面并将SCN添加到SCN场景中时，才能使用

physicsWorld（u:didbeagin:）

实例方法检测碰撞：

---

抱歉，无法理解什么是真实世界检测到的飞机

fileprivate func createSphere() -> SCNNode {

    var sphere = SCNNode()
    sphere.geometry = SCNSphere(radius: 0.1)

    sphere.physicsBody = SCNPhysicsBody(type: .dynamic, shape: nil)
    sphere.physicsBody?.isAffectedByGravity = true

    sphere.physicsBody?.categoryBitMask = Category.sphereCategory.rawValue
    sphere.physicsBody?.collisionBitMask = Category.targetCategory.rawValue

    return sphere
}

fileprivate func visualizeDetectedPlane() -> SCNNode {

    var plane = SCNNode()
    plane.geometry = SCNPlane(width: 0.7, height: 0.7)

    plane.physicsBody = SCNPhysicsBody(type: .dynamic, shape: nil)
    plane.physicsBody?.isAffectedByGravity = false

    plane.physicsBody?.categoryBitMask = Category.targetCategory.rawValue
    plane.physicsBody?.collisionBitMask = Category.sphereCategory.rawValue

    return plane
}

func physicsWorld(_ world: SCNPhysicsWorld, didBegin contact: SCNPhysicsContact) {

    if contact.nodeA.physicsBody?.categoryBitMask == 
                                         Category.targetCategory.rawValue || 
       contact.nodeB.physicsBody?.categoryBitMask == 
                                         Category.targetCategory.rawValue {

        print("BOOM!")
    }
}