使用Pinch手势在运行时缩放SCNNode

Question

我正在尝试使用Pinch手势实时缩放和SCNNode：

这是我当前的代码

let pinchGestureRecognizer = UIPinchGestureRecognizer(target: self, action: #selector(handlePinch(from:)))
sceneView.addGestureRecognizer(pinchGestureRecognizer)

@objc
func handlePinch(from recognizer: UIPinchGestureRecognizer){
  var pinchScale = recognizer.scale
  pinchScale = round(pinchScale * 1000) / 1000.0

  sceneView.scene.rootNode.enumerateChildNodes { (node, stop) -> Void in
    if(node.name == "Box01"){
       node.scale = SCNVector3(x: pinchScale, y: pinchScale, z: pinchScale)
    }
  }        
}

但是，节点不能按比例缩放吗？有人可以指出我的错误吗？

像这样加载SCNNode并在其上应用动画，

sceneView.scene.rootNode.addChildNode(node)
loadAnimation(animation: .Attack, sceneName: "art.scnassets/attack", animationIdentifier: "attackID");

Answer 1

迅速运作

@objc func handlePinch(gesture: UIPinchGestureRecognizer){
    if(scnnodeSelected){

        if (gesture.state == .changed) {
            let pinchScaleX = Float(gesture.scale) * tappedObjectNode.scale.x
            let pinchScaleY =  Float(gesture.scale) * tappedObjectNode.scale.y
            let pinchScaleZ =  Float(gesture.scale) * tappedObjectNode.scale.z
            tappedObjectNode.scale = SCNVector3(pinchScaleX, pinchScaleY, pinchScaleZ)
            gesture.scale=1
        }
    }
}

Answer 2

func addPinchGestureToSceneView(){
    let pinchGestureRecognizer = UIPinchGestureRecognizer(target: self, action: #selector(ViewController.handlePitch(withGestureRecognizer:)))
    sceneView.addGestureRecognizer(pinchGestureRecognizer)
}


@objc func handlePitch(withGestureRecognizer recognizer: UIPinchGestureRecognizer) {
    let tapRecognizer = recognizer.location(in: sceneView)
    let hitTestResults = sceneView.hitTest(tapRecognizer)
    guard let node = hitTestResults.first?.node else {
        return
    }

    if (recognizer.state == .changed) {
        let pinchScaleX = Float(recognizer.scale) * node.scale.x
        let pinchScaleY =  Float(recognizer.scale) * node.scale.y
        let pinchScaleZ =  Float(recognizer.scale) * node.scale.z

        node.scale = SCNVector3(x: Float(pinchScaleX), y: Float(pinchScaleY), z: Float(pinchScaleZ))
        recognizer.scale=1
    }

}

Answer 3

我用它来处理比例：

@objc
func handlePinch(from recognizer: UIPinchGestureRecognizer){
    var pinchScale = round(recognizer.scale * 1000)/1000000
    let node_arm = sceneView.scene.rootNode.childNode(withName: "army", recursively: true)
    node_arm?.runAction(.customAction(duration: 0, action: { node, progress in
        node.physicsBody = nil
        node.scale = SCNVector3(x: Float(pinchScale), y: Float(pinchScale), z: Float(pinchScale))
    }))
}