swift 快速奔跑的兔几 本节的内容是：SceneKit命中检测

概述命中检测过程是指在视图上去一点，找出3D中的哪个对象位于视图上这个点的下方。实际上就是要回答：我点了谁？ 在对一个SceneKit视图进行命中检测时，会得到一个SCNHitTestResult对象的数组，其中描述了找到的对象，以及该对象的相关信息。 下面这段代码可以让你点击的地方短暂的发亮一下： import UIKitimport SceneKitimport SpriteKitclas

命中检测过程是指在视图上去一点，找出3D中的哪个对象位于视图上这个点的下方。实际上就是要回答：我点了谁？

在对一个SceneKit视图进行命中检测时，会得到一个SCNHitTestResult对象的数组，其中描述了找到的对象，以及该对象的相关信息。

下面这段代码可以让你点击的地方短暂的发亮一下：

import UIKitimport SceneKitimport SpriteKitclass SceneKitVIEwController: UIVIEwController {    overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()        let sceneVIEw = self.vIEw as! SCNVIEw        sceneVIEw.backgroundcolor = UIcolor.graycolor()        //sceneVIEw.allowsCameraControl = true        // 添加场景        let sceneOne = SCNScene()        sceneVIEw.scene = sceneOne        // 添加照相机 并指明水平和垂直视角都是45度        let cameraOne = SCNCamera()        cameraOne.xFov = 45        cameraOne.yFov = 45        // 将照相机附加到节点        let cameraNode = SCNNode()        cameraNode.camera = cameraOne        cameraNode.position = SCNVector3(0,0,20)        sceneOne.rootNode.addChildNode(cameraNode)        // 添加3D对象         let capsuleOne = SCNCapsule(capRadius: 2.5,height: 10)        let capsuleNodeOne = SCNNode(geometry: capsuleOne)        capsuleNodeOne.position = SCNVector3(0,0)        sceneOne.rootNode.addChildNode(capsuleNodeOne)        // 添加环境光源        let ambIEntlight = SCNlight()        ambIEntlight.type = SCNlightTypeAmbIEnt        ambIEntlight.color = UIcolor(white: 0.25,Alpha: 1.0)        let ambIEntNodeOne = SCNNode()        ambIEntNodeOne.light = ambIEntlight        sceneOne.rootNode.addChildNode(ambIEntNodeOne)        // 添加泛光源        let omnilight = SCNlight()        omnilight.type = SCNlightTypeOmni        omnilight.color = UIcolor(white:1.0,Alpha: 1.0)        let omniNodeOne = SCNNode()        omniNodeOne.light = omnilight        omniNodeOne.position = SCNVector3(-5,8,5)        sceneOne.rootNode.addChildNode(omniNodeOne)        // 为场景中的内容实现动画        let moveUpAndDownAnimation = CABasicAnimation(keyPath: "position")        moveUpAndDownAnimation.byValue = NSValue(SCNVector3:SCNVector3(0,5,0))        // 在最后加速和减速，而不是机械d跳        moveUpAndDownAnimation.timingFunction = camediatimingFunction(name: kcamediatimingFunctionEaseInEaSEOut)        // 在末端自动返回        moveUpAndDownAnimation.autoreverses = true        // 动画无限次循环        moveUpAndDownAnimation.repeatCount = float.infinity        moveUpAndDownAnimation.duration = 2        // 添加到一个节点        capsuleNodeOne.addAnimation(moveUpAndDownAnimation,forKey: "upAndDown")        // 创建文本几何体        let text3D = SCNText(string: "BlaBlaBla",extrusionDepth: 0.3)        text3D.Font = UIFont.systemFontOfSize(2)        let textNode = SCNNode(geometry: text3D)        textNode.position = SCNVector3(-5,6,0)        capsuleNodeOne.addChildNode(textNode)        // 合并动画        let rotateAnimation = CABasicAnimation(keyPath: "eulerAngles")        rotateAnimation.byValue = NSValue(SCNVector3: SCNVector3(x: float(0),y: float(M_PI*2),z: float(0)))        rotateAnimation.repeatCount = float.infinity        rotateAnimation.duration = 4        textNode.addAnimation(rotateAnimation,forKey: "rotation")        // 质感和纹理        let redMetallicMaterial = SCNMaterial()        redMetallicMaterial.diffuse.contents = UIcolor.graycolor()        redMetallicMaterial.specular.contents = UIcolor.whitecolor()        redMetallicMaterial.shininess = 1        capsuleOne.materials = [redMetallicMaterial]        // 文字纹理        let noiseTexture = SKTexture(noiseWithSmoothness:0.25,size:CGSize(wIDth: 512,height: 512),grayscale:true)        let noiseMaterial = SCNMaterial()        noiseMaterial.diffuse.contents = noiseTexture        text3D.materials = [noiseMaterial]        // 法向贴图        let noisenormalMapTexture = noiseTexture.textureByGeneratingnormalMapWithSmoothness(0.1,contrast: 1)        redMetallicMaterial.normal.contents = noisenormalMapTexture        // 命中检测        let tapRecognizerOne = UITapGestureRecognizer(target: self,action: "tapped:")        sceneVIEw.addGestureRecognizer(tapRecognizerOne)        // 启动用户交互        sceneVIEw.userInteractionEnabled = true    }    func tapped(tapRecognizer:UITapGestureRecognizer){        if tapRecognizer.state == UIGestureRecognizerState.Ended{            let sceneVIEw = self.vIEw as! SCNVIEw            let hits = sceneVIEw.hitTest(tapRecognizer.locationInVIEw(tapRecognizer.vIEw),options: nil) as [SCNHitTestResult]            for hit in hits {                if let theMaterial = (hit.node.geometry?.materials[0]) as SCNMaterial? {                    let highlightAnimation = CABasicAnimation(keyPath: "contents")                    highlightAnimation.fromValue = UIcolor.blackcolor()                    highlightAnimation.tovalue = UIcolor.yellowcolor()                    highlightAnimation.autoreverses = true                    highlightAnimation.repeatCount = 0                    highlightAnimation.duration = 0.3                    theMaterial.emission.addAnimation(highlightAnimation,forKey: "highlight")                }            }        }    }}

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