如何向右滑动时旋转到 3d 立方体的另一个面

Question

我使用 SceneKit 创建了一个 3D 立方体，并添加了一个手势来识别向右滑动。但是，我不知道向右滑动时如何将立方体旋转到另一个面。我不希望立方体在滑动时连续旋转，只移动到右侧的另一个面。很抱歉有任何困惑。

这是我创建多维数据集的代码：

import UIKit
import SceneKit
class ViewController: UIViewController {
// UI
@IBOutlet weak var geometryLabel: UILabel!
@IBOutlet weak var sceneView: SCNView!
// Geometry
var geometryNode: SCNNode = SCNNode()
// Gestures
var currentAngle: Float = 0.0
// MARK: Lifecycle
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
// MARK: Scene
sceneSetup()

}
func sceneSetup() {
let scene = SCNScene()
sceneView.scene = scene
sceneView.allowsCameraControl = false
sceneView.autoenablesDefaultLighting = true
let cameraNode = SCNNode()
cameraNode.camera = SCNCamera()
cameraNode.position = SCNVector3Make(0, 0, 25)
scene.rootNode.addChildNode(cameraNode)
var geometries = [
SCNBox(width: 8.0, height: 8.0, length: 8.0, chamferRadius: 1.0)
]
var materials = [SCNMaterial]()
for i in 1...6 {
let material = SCNMaterial()
if i == 1 { material.diffuse.contents = UIColor(red:0.02, green:0.98, blue:0.98, alpha:1.0) }
if i == 2 { material.diffuse.contents = UIColor(red:0.02, green:0.98, blue:0.98, alpha:1.0) }
if i == 3 { material.diffuse.contents = UIColor(red:0.02, green:0.98, blue:0.98, alpha:1.0) }
if i == 4 { material.diffuse.contents = UIColor(red:0.02, green:0.98, blue:0.98, alpha:1.0) }
if i == 5 { material.diffuse.contents = UIColor(red:0.02, green:0.98, blue:0.98, alpha:1.0) }
if i == 6 { material.diffuse.contents = UIColor(red:0.02, green:0.98, blue:0.98, alpha:1.0) }
materials.append(material)
}
for i in 0..<geometries.count {
let geometry = geometries[i]
let node = SCNNode(geometry: geometry)
node.geometry?.materials = materials
scene.rootNode.addChildNode(node)
}

let swipeRight: UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(respondToSwipeGesture(gesture:)))
swipeRight.direction = .right
sceneView.addGestureRecognizer(swipeRight)

}

识别时向右滑动手势的功能：

func respondToSwipeGesture(gesture: UIGestureRecognizer) {

if let swipeGesture = gesture as? UISwipeGestureRecognizer {

switch swipeGesture.direction {
case UISwipeGestureRecognizerDirection.right:
print("Swiped Right")
default:
break
}
}
}

Answer 1

您需要使用一个SCNAction.rotate获取节点旋转的当前 w 值并添加您想要的角度量，使用这 2 个扩展转换为弧度和弧度，将我的 self.shipNode 替换为您的立方体节点，并根据需要更改轴，考虑到SCNVector4Make句子中的第一个 0 是 X 轴

这是一个例子

extension Int {
var degreesToRadians: Double { return Double(self) * .pi / 180 }
var radiansToDegrees: Double { return Double(self) * 180 / .pi }
}
extension FloatingPoint {
var degreesToRadians: Self { return self * .pi / 180 }
var radiansToDegrees: Self { return self * 180 / .pi }
}
@objc func handleTap(_ gestureRecognize: UIGestureRecognizer) {
//here we rotate the ship node 30 grades in the Y axis each time
self.shipNode?.runAction(SCNAction.rotate(toAxisAngle: SCNVector4Make(0, 1, 0, (self.shipNode?.rotation.w)! + Float(30.degreesToRadians)), duration: 1))
}

要向下旋转，您只需更改旋转轴你可以使用这个

- (void) handleTap:(UIGestureRecognizer*)gestureRecognize
{
[self.ship runAction:[SCNAction rotateToAxisAngle:SCNVector4Make(1, 0, 0, [self getRadiansFromAngle:[self getAngleFromRadian:self.ship.rotation.w] + 30]) duration:1]];
}

已更新使用您的代码您需要改用SCNAction.rotate(by: #Float, around: #SCNVector3, duration: #duration)方法，下面是您的查询的完整代码

@objc func respondToSwipeGesture(gesture: UIGestureRecognizer) {

if let swipeGesture = gesture as? UISwipeGestureRecognizer {

switch swipeGesture.direction {
case UISwipeGestureRecognizerDirection.right:
print("Swiped Right")
geometryNode.runAction(SCNAction.rotate(by: CGFloat(90.degreesToRadians), around: SCNVector3Make(0, 1, 0), duration: 0.2))

case UISwipeGestureRecognizerDirection.left:
print("Swiped Left")
geometryNode.runAction(SCNAction.rotate(by: CGFloat(-90.degreesToRadians), around: SCNVector3Make(0, 1, 0), duration: 0.2))
case UISwipeGestureRecognizerDirection.down:
print("Swiped Down")
geometryNode.runAction(SCNAction.rotate(by: CGFloat(90.degreesToRadians), around: SCNVector3Make(1, 0, 0), duration: 0.2))
default:
break
}
}
}