将CIFilter添加到SCNNode可将节点变成白盒

问题描述

我想在ARKit中显示的SCNNode上添加CIGaussianBlur.

I'd like to add a CIGaussianBlur to a SCNNode that is being displayed in ARKit.

但是，添加该过滤器会将节点变成白盒".这是不带过滤器的节点.

However, adding that filter turns the node into "a white box". Here is the node without and with filter.

否CIFilter

No CIFilter

使用CIFilter

With CIFilter

以下是相关代码:

let gaussianBlurFilter = CIFilter(name: "CIGaussianBlur")!
gaussianBlurFilter.name = "blur"

node.filters = [gaussianBlurFilter]
let material = node.geometry?.firstMaterial
material?.diffuse.contents = UIColor.blue

node.position = SCNVector3(x: 0, y: 0, z: -0.39)
camera.addChildNode(node)

先前的堆栈溢出问题表明无法在Metal上添加CIFilter，但我认为从iOS 11开始现在是可能的.

Previous Stack Overflow questions have suggested that adding a CIFilter isn't possible on Metal, but I believe that is now possible as of iOS 11.

此外，我正在尝试在SCNNode上实现UIVisualEffectView型效果，因此，如果您知道另一种实现方法，请告诉我！

Also, I'm trying to achieve a UIVisualEffectView-type effect on an SCNNode, so if you know of another way to accomplish that please let me know!

推荐答案

您可以尝试以下操作:

let gaussianBlur    = CIFilter(name: "CIGaussianBlur")
gaussianBlur?.name  = "blur"
gaussianBlur?.setValue(15, forKey: "inputRadius")
node.filters        = [gaussianBlur] as? [CIFilter]

并像这样配置SceneView:

and configure the SceneView like so:

sceneView.antialiasingMode    = .none
sceneView.isJitteringEnabled  = false

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