SKLightNode没有使用SKCameraNode进行缩放

Question

在雪碧套件中，我使用SKCameraNode来放大和缩小一个SKScene。场景中的任何SKLightNodes都不会放大。他们不是相机的孩子，所以不应该是不变的。在上面找不到任何东西--搜索"SKLightNode SKCameraNode“就可以得到0的结果。

使用Xcode 8.3.3并从一个基本的Game/Swift项目开始，我将GameScene.swift中的GameScene.swift()替换为：

override func sceneDidLoad() {

    let cameraNode = SKCameraNode()
    cameraNode.position = CGPoint(x:0.0, y:0.0)
    self.addChild(cameraNode)
    self.camera = cameraNode

    let bg = SKSpriteNode(color:.red, size:self.size)
    bg.lightingBitMask = 0b0001
    self.addChild(bg)

    let lightNode = SKLightNode()
    lightNode.position = CGPoint(x:0.0, y:0.0)
    lightNode.categoryBitMask = 0b0001
    lightNode.lightColor = .white
    lightNode.falloff = 1.0
    self.addChild(lightNode)

    let zoomDuration:TimeInterval = 10.0
    let zoomAction = SKAction.sequence([
        SKAction.scale(to:0.25, duration:zoomDuration),
        SKAction.scale(to:1.0, duration:zoomDuration)
        ])
    self.camera?.run(zoomAction)

}

正如你所看到的，光线在放大过程中保持不变。

为了解决这个问题，我尝试了下面的自定义操作来调整光的falloff属性。这有点好，但这不是一个忠实的缩放。

    let lightAction1 = SKAction.customAction(withDuration: zoomDuration) {
        (node, time) -> Void in
        let lightNode = node as! SKLightNode
        let ratio:CGFloat = time / CGFloat(zoomDuration)
        let startFalloff:CGFloat = 1.0
        let endFalloff:CGFloat = 0.25
        let falloff:CGFloat = startFalloff*(1.0-ratio) + endFalloff*ratio
        lightNode.falloff = falloff
    }
    let lightAction2 = SKAction.customAction(withDuration: zoomDuration) {
        (node, time) -> Void in
        let lightNode = node as! SKLightNode
        let ratio:CGFloat = time / CGFloat(zoomDuration)
        let startFalloff:CGFloat = 0.25
        let endFalloff:CGFloat = 1.0
        let falloff:CGFloat = startFalloff*(1.0-ratio) + endFalloff*ratio
        lightNode.falloff = falloff
    }
    let lightSequence = SKAction.sequence([lightAction1, lightAction2])
    lightNode.run(lightSequence)

照相机一定要放大光线吗？我是不是遗漏了什么？

编辑:下面的建议是一些扩展SKView的代码：

    let originalWidth:CGFloat = UIScreen.main.bounds.width
    let originalHeight:CGFloat = UIScreen.main.bounds.height

    let lightAction1 = SKAction.customAction(withDuration: zoomDuration) {
        (node, time) -> Void in
        let ratio:CGFloat = time / CGFloat(zoomDuration)
        let startFalloff:CGFloat = 1.0
        let endFalloff:CGFloat = 1.5
        let falloff:CGFloat = startFalloff*(1.0-ratio) + endFalloff*ratio
        self.view?.frame = CGRect(x: (originalWidth-originalWidth*falloff)/2.0, y: (originalHeight-originalHeight*falloff)/2.0, width: originalWidth*falloff, height: originalHeight*falloff)
    }
    let lightAction2 = SKAction.customAction(withDuration: zoomDuration) {
        (node, time) -> Void in
        let ratio:CGFloat = time / CGFloat(zoomDuration)
        let startFalloff:CGFloat = 1.5
        let endFalloff:CGFloat = 1.0
        let falloff:CGFloat = startFalloff*(1.0-ratio) + endFalloff*ratio
        self.view?.frame = CGRect(x: (originalWidth-originalWidth*falloff)/2.0, y: (originalHeight-originalHeight*falloff)/2.0, width: originalWidth*falloff, height: originalHeight*falloff)
    }
    let lightSequence = SKAction.sequence([lightAction1, lightAction2])
    lightNode.run(lightSequence)

你还需要将相机放大一半。唯一的问题是，所有的东西都是缩放的(甚至像分数/按钮一样作为子节点添加到CameraNode中)。

Answer 1

我要感谢你提供了一个我们可以测试的例子。通过玩它，我肯定可以看到光线的增长和收缩，但它并不是太多，(如果你把相机移离位置(0,0)

我甚至尝试将SKLightNode添加到单独的SKNode中，并对节点进行缩放，但结果是相同的。

我还试图将场景调整到更大的大小，但结果仍然一样。

然后，我决定玩视图大小，低，看，我能够得到不同的结果，当我调整这一点。这意味着SKLightNode比SKView大，而不是SKScene大小(真的是苹果？)。这或者离开了SKView提供的上下文。无论哪种方式，看起来您都没有使用SKLightNode进行缩放。(顺便说一句，阴影还在放大，所以也许你只需要在更好的照明效果下工作？)