SK3dNode沿着y轴旋转

Question

我在spritekit有一颗3D恒星，让它沿着z轴旋转，所以看起来就像它的旋转。

但是我不能让它旋转。该文件是我导入到我的项目中的.dae文件。恒星本身承载，但什么也没有发生。有谁知道吗？

import SpriteKit

override func didMove(to view: SKView) {
    let starScene = SCNScene.init(named: "star.dae")
    let star3d = SK3DNode(viewportSize: CGSize(width: 330, height: 330))
    star3d.position = CGPoint(x: self.frame.midX, y: self.frame.midY)
    star3d.scnScene = starScene
    star3d.zPosition = 3
    star3d.isPlaying = true
    star3d.scnScene = starScene

    let camera = SCNCamera()
    camera.xFov = 60
    camera.yFov = 60

    var cameraNode = SCNNode()
    cameraNode = SCNNode()
    cameraNode.camera = camera
    cameraNode.position = SCNVector3(x: 0, y: 0, z: 15)

    let rotationAnimation = CABasicAnimation(keyPath: "rotation")
    rotationAnimation.toValue = NSValue(scnVector4: SCNVector4Make(1, 2, 3, .pi * 2))
    rotationAnimation.duration = 6
    rotationAnimation.repeatCount = FLT_MAX

    starScene?.rootNode.addChildNode(cameraNode)
    star3d.pointOfView = cameraNode
    self.addChild(star3d)

    cameraNode.addAnimation(rotationAnimation, forKey: nil)
}

Answer 1

多亏了哈尔·米勒。通过在spritekit中添加一个sk3dnode，下面的代码可以实现以下旋转星型效果。

media0.giphy.com/media/rOhH4D15SlWCc/giphy.gif

如果动画没有在您的设备上运行。在项目.plist文件中添加下一行。PrefersOpenGL =是

let starScene = SCNScene.init(named: "Round_CStar_obj.obj.dae")
    let star3d = SK3DNode(viewportSize: CGSize(width: 300, height: 300))
    star3d.position = CGPoint(x: self.frame.midX, y: self.frame.midY)
    star3d.scnScene = starScene
    star3d.name = "star3d"
    star3d.zPosition = 3
    star3d.zRotation = 6
    star3d.isPlaying = true
    star3d.scnScene = starScene
    self.addChild(star3d)

    let camera = SCNCamera()
    camera.usesOrthographicProjection = true
    camera.orthographicScale = 9
    camera.zNear = 0
    camera.zFar = 200

    var cameraNode = SCNNode()
    cameraNode = SCNNode()
    cameraNode.camera = camera
    cameraNode.position = SCNVector3(x: 0, y: 0, z: 0)
    cameraNode.eulerAngles = SCNVector3(x: 0, y: 0, z: 0)
    starScene?.rootNode.addChildNode(cameraNode)
    star3d.pointOfView = cameraNode

    let rotationAnimation = CABasicAnimation(keyPath: "rotation")
    rotationAnimation.toValue = NSValue(scnVector4: SCNVector4Make(0, 1, 0, .pi * 2))
    rotationAnimation.duration = 2
    rotationAnimation.repeatCount = FLT_MAX
    cameraNode.addAnimation(rotationAnimation, forKey: nil)