如何使用平移手势旋转场景中的对象 - SceneKit

问题描述

我想用 Scene 工具包创建一个应用程序来解决 Rubix Cube.我有自己的多维数据集 dae 文件.这是我在 viewDidLoad 中的设置代码

I'm tying to create an app with Scene kit to solve Rubix Cube. I've my own dae file for the cube. this is my setup code in viewDidLoad

    let myscene = SCNScene(named: "Rubik1.scnassets/Rubiks_Cube.dae")
    scene.rootNode.addChildNode((myscene?.rootNode)!)

    // retrieve the SCNView
    let scnView = self.view as! SCNView

    // set the scene to the view
    scnView.scene = scene

    geometryNode = (scnView.scene?.rootNode.childNodeWithName("Cube",recursively: true))!

    let panRecognizer = UIPanGestureRecognizer(target: self, action: "panGesture:")
    scnView.addGestureRecognizer(panRecognizer)

在识别平移手势以旋转立方体时

upon recognising a pan gesture to rotate the cube

func panGesture(gestureRecognize: UIPanGestureRecognizer){

    let translation = gestureRecognize.translationInView(gestureRecognize.view!)

    let x = Float(translation.x)
    let y = Float(-translation.y)

    let anglePan = sqrt(pow(x,2)+pow(y,2))*(Float)(M_PI)/180.0

    var rotationVector = SCNVector4()
    rotationVector.x = -y
    rotationVector.y = x
    rotationVector.z = 0
    rotationVector.w = anglePan

    geometryNode.rotation = rotationVector

    //geometryNode.transform = SCNMatrix4MakeRotation(anglePan, -y, x, 0)

    if(gestureRecognize.state == UIGestureRecognizerState.Ended) {
        //
    }
}

上面的代码不保留以前的平移手势.如何使用旋转向量"或

above code doesn't preserve the previous pan gestures. how do I use "rotationvector" or

SCNMatrix4MakeRotation(anglePan, -y, x, 0)

旋转立方体

推荐答案

问题解决了

if(gestureRecognize.state == UIGestureRecognizerState.Ended) {

    let currentPivot = geometryNode.pivot
    let changePivot = SCNMatrix4Invert( geometryNode.transform)

    geometryNode.pivot = SCNMatrix4Mult(changePivot, currentPivot)

    geometryNode.transform = SCNMatrix4Identity
}

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