为代码中的引用节点指定类别、冲突和接触位掩码

Question

我有一个基于关卡的游戏，所以我使用Xcode场景编辑器来创建关卡，但在检测对象之间的碰撞时遇到了问题，这些对象是在单独的场景中创建的，并在游戏场景中作为参考节点拖动。

似乎如果我试图创建一个对象的物理体，该对象在我创建它的.scn文件中用作参考节点，那么该物理体不会被引用到游戏场景中的节点，而是直接在场景编辑器中创建的属性。

如果我尝试通过代码设置每个实际上是参考节点的节点的物理体，它确实设置了它（物理体不是零），但没有检测到碰撞。

这是我设置物理体的代码：

    // player (I want to be notified when player collides with any walls)
    playerNode = level1Scene.rootNode.childNodeWithName("playerNode", recursively: true)!
    playerNode.physicsBody = SCNPhysicsBody(type: .Dynamic, shape: nil)
    playerNode.physicsBody?.affectedByGravity = false
    playerNode.physicsBody?.categoryBitMask = PhysicsCategory.Player.rawValue
    playerNode.physicsBody?.collisionBitMask = PhysicsCategory.Wall.rawValue
    playerNode.physicsBody?.contactTestBitMask = PhysicsCategory.Wall.rawValue
    //wall from separate .scn file
    let wallScene = SCNScene(named: "wallObject.scn")
    let wall = wallScene!.rootNode.childNodeWithName("wall", recursively: true)!
    wall.physicsBody = SCNPhysicsBody(type: .Kinematic, shape: nil)
    wall.physicsBody?.categoryBitMask = PhysicsCategory.Wall.rawValue
    wall.physicsBody?.collisionBitMask = PhysicsCategory.Player.rawValue
    wall.physicsBody?.contactTestBitMask = PhysicsCategory.Player.rawValue
    // walls that are reference nodes of the wall and are located in game scene 
    let wall2 = level1Scene.rootNode.childNodeWithName("wallObject reference", recursively: true)!
    wall2.physicsBody = SCNPhysicsBody(type: .Kinematic, shape: nil)
    wall2.physicsBody?.categoryBitMask = PhysicsCategory.Wall.rawValue
    wall2.physicsBody?.collisionBitMask = PhysicsCategory.Player.rawValue
    wall2.physicsBody?.contactTestBitMask = PhysicsCategory.Player.rawValue
    print(wall2.physicsBody!) // prints <SCNPhysicsBody: 0x7fe5f9dc75a0>

我没有就任何接触与我联系，球员也没有在接触时与任何墙壁发生身体碰撞。我已使该类符合SCNPhysicsContactDelegate协议：

extension GameViewController: SCNPhysicsContactDelegate {
    func physicsWorld(world: SCNPhysicsWorld, didBeginContact contact: SCNPhysicsContact) {
        playerNode.physicsBody?.velocity = SCNVector3Zero
        print("player and wall collided")
    }
}

并将联系人代表设置为我的游戏场景：

level1Scene.physicsWorld.contactDelegate = self

两天来，我一直在努力让它发挥作用，但没有成功。当我使用Sprite Kit时，我几乎总能找到关于我的问题的相关帖子，即使在发布我的问题时，我也会得到答案。但我想场景工具包并没有那么受欢迎，我什么都找不到。

如果你知道我错在哪里，或者如何在代码中检测到冲突，请告诉我。

Answer 1

我粗略地根据您发布的代码拼凑了一个示例，唯一的"问题"是它有效，因为成功地调用了联系人委托。在这种情况下，玩家的几何体是SceneKit宇宙飞船，wall2是添加到另一个场景中的SCNBox，然后从Finder拖动到飞船场景中。我已经计算了重力，所以船刚好掉到墙上。

对象是否会相互反弹，只是没有调用您的联系人代理？或者这些物体互相穿过。我还想知道你是如何移动玩家对象来引起接触的？

import UIKit
import QuartzCore
import SceneKit
let colors = [UIColor.redColor(), UIColor.brownColor(), UIColor.cyanColor(), UIColor.greenColor(), UIColor.yellowColor(), UIColor.blueColor()]
enum PhysicsCategory:Int {
    case Player = 2
    case Wall = 4
}
extension GameViewController: SCNPhysicsContactDelegate {
    func physicsWorld(world: SCNPhysicsWorld, didBeginContact contact: SCNPhysicsContact) {
        playerNode.geometry?.firstMaterial?.diffuse.contents = colors[Int(arc4random_uniform(UInt32(colors.count)))]
        print("player and wall collided")
    }
}
class GameViewController: UIViewController {
    var playerNode:SCNNode!
    override func viewDidLoad() {
        super.viewDidLoad()
        // create a new scene
        //let scene = SCNScene()
        let scene = SCNScene(named: "art.scnassets/ship.scn")!
        //playerNode = SCNNode(geometry: SCNBox(width: 1, height: 1, length: 1, chamferRadius: 0))
        playerNode = scene.rootNode.childNodeWithName("ship", recursively: true)!
        playerNode.geometry?.firstMaterial?.diffuse.contents = UIColor.redColor()
        playerNode.physicsBody = SCNPhysicsBody(type: .Dynamic, shape: nil)
        playerNode.physicsBody?.affectedByGravity = true
        playerNode.physicsBody?.categoryBitMask = PhysicsCategory.Player.rawValue
        playerNode.physicsBody?.collisionBitMask = PhysicsCategory.Wall.rawValue
        playerNode.physicsBody?.contactTestBitMask = PhysicsCategory.Wall.rawValue
        initPlayer()
        //scene.rootNode.addChildNode(playerNode)
        //let wall = SCNNode(geometry: SCNBox(width: 20, height: 0.25, length: 20, chamferRadius: 0))
        let wallScene = SCNScene(named: "art.scnassets/wallObject.scn")
        let wall = wallScene!.rootNode.childNodeWithName("wall", recursively: true)!
        wall.physicsBody = SCNPhysicsBody(type: .Kinematic, shape: nil)
        wall.physicsBody?.categoryBitMask = PhysicsCategory.Wall.rawValue
        wall.physicsBody?.collisionBitMask = PhysicsCategory.Player.rawValue
        wall.physicsBody?.contactTestBitMask = PhysicsCategory.Player.rawValue
        //scene.rootNode.addChildNode(wall)
        let wall2 = scene.rootNode.childNodeWithName("wallObject reference", recursively: true)!
        wall2.physicsBody = SCNPhysicsBody(type: .Kinematic, shape: nil)
        wall2.physicsBody?.categoryBitMask = PhysicsCategory.Wall.rawValue
        wall2.physicsBody?.collisionBitMask = PhysicsCategory.Player.rawValue
        wall2.physicsBody?.contactTestBitMask = PhysicsCategory.Player.rawValue

        scene.physicsWorld.contactDelegate = self
        // retrieve the SCNView
        let scnView = self.view as! SCNView
        scnView.playing = true
        scnView.scene = scene
        scnView.allowsCameraControl = true
        scnView.autoenablesDefaultLighting = true
        scnView.showsStatistics = true
        scnView.backgroundColor = UIColor.lightGrayColor()
        // add a tap gesture recognizer
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleTap(_:)))
        scnView.addGestureRecognizer(tapGesture)
    }
    func handleTap(gestureRecognize: UIGestureRecognizer) {
        initPlayer()
    }
    func initPlayer() {
        playerNode.position = SCNVector3Make(0, 12, 0)
        playerNode.eulerAngles = SCNVector3Make(Float(drand48() * M_PI/2), Float(drand48() * M_PI/2), Float(drand48() * M_PI/2))
        playerNode.physicsBody?.velocity = SCNVector3Zero
        playerNode.physicsBody?.angularVelocity = SCNVector4Zero
    }
}