Question

对于我的AR应用程序，我要从.dae文件添加一个Node。然后，我使用tapRecognizer尝试选择节点并向其中添加动画。

选择节点后，我将显示一个我想控制动画（擦洗）的女巫UISlider

我能够放置节点，选择它并通过动画对其进行擦洗。但是由于您无法将参数传递给UISlider，因此我在全局SCNNode上执行操作。我无法使其在会话中与多个节点一起运行。

当我尝试将animationPlayer添加到Node时，我的程序失败，hitTest返回。它失败，因为它为零。

这是用于添加节点

    func addItem() {
    let dancingNode = SCNNode()
    let results = sceneView?.hitTest(screenCenter, types: .existingPlaneUsingExtent).first
    if results == nil{
        print("find surface")
    }else{
        print("place")
        let transform = results!.worldTransform
        let thirdColumn = transform.columns.3
        let sceneURL = Bundle.main.url(forResource: "art.scnassets/twist_danceFixed", withExtension: "dae")
        let sceneSource = SCNSceneSource(url: sceneURL!, options: nil)
        let animationObject = sceneSource?.entryWithIdentifier("twist_danceFixed-1", withClass: CAAnimation.self)
        animationObject?.speed = 0.0
        let idleScene = SCNScene(named: "art.scnassets/idleFixed.dae")!
        for child in idleScene.rootNode.childNodes {
            child.categoryBitMask = BodyType.ObjectModel.rawValue
            dancingNode.addChildNode(child)
            }
        dancingNode.addAnimation(animationObject!, forKey: "dancing" )
        dancingNode.position = SCNVector3(thirdColumn.x,thirdColumn.y,thirdColumn.z)
        dancingNode.scale = SCNVector3(0.01, 0.01, 0.01)
        dancingNode.categoryBitMask = BodyType.ObjectModel.rawValue
        self.sceneView.scene.rootNode.addChildNode(dancingNode)
    }
}

这是手势识别器：

 @objc func tap(recognizer :UITapGestureRecognizer) {
    let node = SCNNode()
    let sceneView = recognizer.view as! ARSCNView
    let taplocation = recognizer.location(in: sceneView)
    let hitTest = sceneView.hitTest(taplocation, options: [SCNHitTestOption.categoryBitMask: BodyType.ObjectModel.rawValue])


    for result in hitTest{           
        node.addChildNode(result.node)
    }
    animationPlayer = node.animationPlayer(forKey: "dancing")!

    if !slider.isDescendant(of: self.view) {
        if !hitTest.isEmpty {
            self.view.addSubview(slider)
            }
    }else{
        slider.removeFromSuperview()
    }
}

这是滑块的回调方法：

 @objc func changeVlaue(_ sender: UISlider) {
   let moment = sender.value
   animationPlayer.animation.timeOffset = TimeInterval(moment)
   animationPlayer.play()
   animationPlayer.speed = 0.0
}

选择节点以控制动画

0 个答案: