如何在SpriteKit中模糊场景？

How would I add a gaussian blur to all nodes (there's no fixed number of nodes) in an SKScene in SpriteKit? A label will be added on top of the scene later, this will be my pause menu. Almost anything would help!

如何在SpriteKit中的SKScene中为所有节点添加高斯模糊（没有固定数量的节点）？稍后将在场景顶部添加标签，这将是我的暂停菜单。几乎任何事都有帮助！

Something like this is what I'm going for: 如何在SpriteKit中模糊场景？

这样的事情就是我想要的：

6 个解决方案

#1

What you're looking for is an SKEffectNode. It applies a CoreImage filter to itself (and thus all subnodes). Just make it the root view of your scene, give it one of CoreImage's blur filters, and you're set.

您正在寻找的是SKEffectNode。它将CoreImage过滤器应用于自身（以及所有子节点）。只需将它作为场景的根视图，给它一个CoreImage的模糊滤镜，然后就可以了。

For example, I set up an SKScene with an SKEffectNode as it's first child node and a property, root that holds a weak reference to it:

例如，我设置了一个带有SKEffectNode的SKScene作为它的第一个子节点和一个属性，root用于保存对它的弱引用：

-(void)createLayers{
  SKEffectNode *node = [SKEffectNode node];
  [node setShouldEnableEffects:NO];
  CIFilter *blur = [CIFilter filterWithName:@"CIGaussianBlur" keysAndValues:@"inputRadius", @1.0f, nil];
  [node setFilter:blur];
  [self setRoot:node];
}

And here's the method I use to (animate!) the blur of my scene:

这是我用来（动画！）场景模糊的方法：

-(void)blurWithCompletion:(void (^)())handler{
  CGFloat duration = 0.5f;
  [[self root] setShouldRasterize:YES];
  [[self root] setShouldEnableEffects:YES];
  [[self root] runAction:[SKAction customActionWithDuration:duration actionBlock:^(SKNode *node, CGFloat elapsedTime){
    NSNumber *radius = [NSNumber numberWithFloat:(elapsedTime/duration) * 10.0];
    [[(SKEffectNode *)node filter] setValue:radius forKey:@"inputRadius"];
  }] completion:handler];
}

Note that, like you, I'm using this as a pause screen, so I rasterize the scene. If you want your scene to animate while blurred, you should probably setShouldResterize: to NO.

请注意，像你一样，我将它用作暂停屏幕，所以我光栅化了场景。如果你希望你的场景在模糊的情况下进行动画制作，你应该将theShouldResterize：设置为NO。

And if you're not interested in animating the transition to the blur, you could always just set the filter to an initial radius of 10.0f or so and do a simple setShouldEnableEffects:YES when you want to switch it on.

如果你对动画转换到模糊不感兴趣，你可以随时将过滤器设置为初始半径10.0f左右，并且当你想要打开它时，做一个简单的setShouldEnableEffects：YES。

#2

To add to this by using @Bendegúz's answer and code from http://www.bytearray.org/?p=5360

使用@Bendegúz的答案和代码从http://www.bytearray.org/?p=5360添加到此

I was able to get this to work in my current game project that's being done in IOS 8 Swift. Done a bit differently by returning an SKSpriteNode instead of a UIImage. Also note that my unwrapped currentScene.view! call is to a weak GameScene reference but should work with self.view.frame based on where you are calling these methods. My pause screen is called in a separate HUD class hence why this is the case.

我能够在我目前正在IOS 8 Swift中完成的游戏项目中使用它。通过返回SKSpriteNode而不是UIImage来完成一些不同的操作。另请注意我的unwrapped currentScene.view！ call是一个弱的GameScene引用，但应该根据你调用这些方法的位置使用self.view.frame。我的暂停屏幕在一个单独的HUD类中调用，因此为什么会这样。

I would imagine this could be done more elegantly, maybe more like @jemmons's answer. Just wanted to possibly help out anyone else trying to do this in SpriteKit projects written in all or some Swift code.

我想这可以做得更优雅，也许更像是@ jemmons的回答。只是想在可能用SpriteKit项目编写的全部或部分Swift代码中帮助其他人。

func getBluredScreenshot() -> SKSpriteNode{

    create the graphics context
    UIGraphicsBeginImageContextWithOptions(CGSize(width: currentScene.view!.frame.size.width, height: currentScene.view!.frame.size.height), true, 1)

    currentScene.view!.drawViewHierarchyInRect(currentScene.view!.frame, afterScreenUpdates: true)

    // retrieve graphics context
    let context = UIGraphicsGetCurrentContext()

    // query image from it
    let image = UIGraphicsGetImageFromCurrentImageContext()

    // create Core Image context
    let ciContext = CIContext(options: nil)
    // create a CIImage, think of a CIImage as image data for processing, nothing is displayed or can be displayed at this point
    let coreImage = CIImage(image: image)
    // pick the filter we want
    let filter = CIFilter(name: "CIGaussianBlur")
    // pass our image as input
    filter.setValue(coreImage, forKey: kCIInputImageKey)

    //edit the amount of blur
    filter.setValue(3, forKey: kCIInputRadiusKey)

    //retrieve the processed image
    let filteredImageData = filter.valueForKey(kCIOutputImageKey) as CIImage
    // return a Quartz image from the Core Image context
    let filteredImageRef = ciContext.createCGImage(filteredImageData, fromRect: filteredImageData.extent())
    // final UIImage
    let filteredImage = UIImage(CGImage: filteredImageRef)

    // create a texture, pass the UIImage
    let texture = SKTexture(image: filteredImage!)
    // wrap it inside a sprite node
    let sprite = SKSpriteNode(texture:texture)

    // make image the position in the center
    sprite.position = CGPointMake(CGRectGetMidX(currentScene.frame), CGRectGetMidY(currentScene.frame))

    var scale:CGFloat = UIScreen.mainScreen().scale

    sprite.size.width  *= scale

    sprite.size.height *= scale

    return sprite


}


func loadPauseBGScreen(){

    let duration = 1.0

    let pauseBG:SKSpriteNode = self.getBluredScreenshot()

    //pauseBG.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))
    pauseBG.alpha = 0
    pauseBG.zPosition = self.zPosition + 1
    pauseBG.runAction(SKAction.fadeAlphaTo(1, duration: duration))

    self.addChild(pauseBG)

}

#3

This is my solution for the pause screen. It will take a screenshot, blur it and after that show it with animation. I think you should do it if you don't wanna waste to much fps.

这是我暂停屏幕的解决方案。它会截取屏幕，模糊它，然后用动画显示它。我想你应该这样做，如果你不想浪费很多fps。

-(void)pause {
    SKSpriteNode *pauseBG = [SKSpriteNode spriteNodeWithTexture:[SKTexture textureWithImage:[self getBluredScreenshot]]];
    pauseBG.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame));
    pauseBG.alpha = 0;
    pauseBG.zPosition = 2;
    [pauseBG runAction:[SKAction fadeAlphaTo:1 duration:duration / 2]];
    [self addChild:pauseBG];
}

And this is the helper method:

这是辅助方法：

- (UIImage *)getBluredScreenshot {
    UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, 1);
    [self.view drawViewHierarchyInRect:self.view.frame afterScreenUpdates:YES];
    UIImage *ss = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    CIFilter *gaussianBlurFilter = [CIFilter filterWithName:@"CIGaussianBlur"];
    [gaussianBlurFilter setDefaults];
    [gaussianBlurFilter setValue:[CIImage imageWithCGImage:[ss CGImage]] forKey:kCIInputImageKey];
    [gaussianBlurFilter setValue:@10 forKey:kCIInputRadiusKey];

    CIImage *outputImage = [gaussianBlurFilter outputImage];
    CIContext *context   = [CIContext contextWithOptions:nil];
    CGRect rect          = [outputImage extent];
    rect.origin.x        += (rect.size.width  - ss.size.width ) / 2;
    rect.origin.y        += (rect.size.height - ss.size.height) / 2;
    rect.size            = ss.size;
    CGImageRef cgimg     = [context createCGImage:outputImage fromRect:rect];
    UIImage *image       = [UIImage imageWithCGImage:cgimg];
    CGImageRelease(cgimg);
    return image;
}

#4

This is another example of getting this done in swift 2 without the layers:

这是在没有图层的情况下在swift 2中完成此操作的另一个示例：

func blurWithCompletion() {
let duration: CGFloat = 0.5
let filter: CIFilter = CIFilter(name: "CIGaussianBlur", withInputParameters: ["inputRadius" : NSNumber(double:1.0)])!
scene!.filter = filter
scene!.shouldRasterize = true
scene!.shouldEnableEffects = true
scene!.runAction(SKAction.customActionWithDuration(0.5, actionBlock: { (node: SKNode, elapsedTime: CGFloat) in
    let radius = (elapsedTime/duration)*10.0
    (node as? SKEffectNode)!.filter!.setValue(radius, forKey: "inputRadius")

}))

}

#5

Swift 3 Update: This is @Chuck Gaffney's answer updated for Swift 3. I know this question is tagged objective-c, but this page ranked 2nd in Google for "swift spritekit blur". I changed currentScene to self.

Swift 3更新：这是@Chuck Gaffney对Swift 3更新的答案。我知道这个问题被标记为objective-c，但是这个页面在Google中排名第二，因为“swift spritekit模糊”。我把currentScene改成了自己。

    func getBluredScreenshot() -> SKSpriteNode{

    //create the graphics context
    UIGraphicsBeginImageContextWithOptions(CGSize(width: self.view!.frame.size.width, height: self.view!.frame.size.height), true, 1)

    self.view!.drawHierarchy(in: self.view!.frame, afterScreenUpdates: true)

    // retrieve graphics context
    _ = UIGraphicsGetCurrentContext()

    // query image from it
    let image = UIGraphicsGetImageFromCurrentImageContext()

    // create Core Image context
    let ciContext = CIContext(options: nil)
    // create a CIImage, think of a CIImage as image data for processing, nothing is displayed or can be displayed at this point
    let coreImage = CIImage(image: image!)
    // pick the filter we want
    let filter = CIFilter(name: "CIGaussianBlur")
    // pass our image as input
    filter?.setValue(coreImage, forKey: kCIInputImageKey)

    //edit the amount of blur
    filter?.setValue(3, forKey: kCIInputRadiusKey)

    //retrieve the processed image
    let filteredImageData = filter?.value(forKey: kCIOutputImageKey) as! CIImage
    // return a Quartz image from the Core Image context
    let filteredImageRef = ciContext.createCGImage(filteredImageData, from: filteredImageData.extent)
    // final UIImage
    let filteredImage = UIImage(cgImage: filteredImageRef!)

    // create a texture, pass the UIImage
    let texture = SKTexture(image: filteredImage)
    // wrap it inside a sprite node
    let sprite = SKSpriteNode(texture:texture)

    // make image the position in the center
    sprite.position = CGPoint(x: self.frame.midX, y: self.frame.midY)

    let scale:CGFloat = UIScreen.main.scale

    sprite.size.width  *= scale

    sprite.size.height *= scale

    return sprite


}

func loadPauseBGScreen(){

    let duration = 1.0

    let pauseBG:SKSpriteNode = self.getBluredScreenshot()

    pauseBG.alpha = 0
    pauseBG.zPosition = self.zPosition + 1
    pauseBG.run(SKAction.fadeAlpha(to: 1, duration: duration))

    self.addChild(pauseBG)

}

#6

Swift 4:

斯威夫特4：

add this to your gameScene if you want to blur everything in the scene:

如果要模糊场景中的所有内容，请将其添加到gameScene中：

let  blur = CIFilter(name:"CIGaussianBlur",withInputParameters: ["inputRadius": 10.0])
        self.filter = blur
        self.shouldRasterize = true
        self.shouldEnableEffects = false

change self.shouldEnableEffects = true when you want to use it.

如果要使用它，请更改self.shouldEnableEffects = true。

#1