SCNText 不显示表情符号 - Swift 中的 ARKit

Question

我正在制作一个应用程序，将 SCNText 添加到我创建的名为 sceneView 的 ARSCNView 中。文本完美显示如下：（当 SCNText(string: "Test", extrusionDepth: CGFloat(0.01)) 时）屏幕截图 1：

但是当 SCNText(string: "Test", extrusionDepth: CGFloat(0.01)) SCNText 不显示表情符号时：

截图2：这是完整的代码：

    import UIKit
    import SceneKit
    import ARKit

    import Vision

    class ViewController: UIViewController, ARSCNViewDelegate {

    @IBOutlet weak var sceneView: ARSCNView!

        override func viewDidLoad() {
            super.viewDidLoad()
            // Set the view's delegate
            sceneView.delegate = self

            // Show statistics such as fps and timing information
            sceneView.showsStatistics = true

            // Create a new scene

            let scene = SCNScene()
            // Set the scene to the view
            sceneView.scene = scene

            // Enable Default Lighting - makes the 3D text a bit poppier.
            sceneView.autoenablesDefaultLighting = true
            sceneView.showsStatistics = true

            // Tap Gesture Recognizer
            let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(gestureRecognize:)))

            view.addGestureRecognizer(tapGesture)

        }

        override func viewWillAppear(_ animated: Bool) {
            super.viewWillAppear(animated)
            // Create a session configuration
            let configuration = ARWorldTrackingConfiguration()
            // Enable plane detection
            configuration.planeDetection = .horizontal

            // Run the view's session

            sceneView.session.run(configuration)
        }

        override func viewWillDisappear(_ animated: Bool) {
            super.viewWillDisappear(animated)

            // Pause the view's session
            sceneView.session.pause()
        }
        // MARK: - ARSCNViewDelegate

        func renderer(_ renderer: SCNSceneRenderer, updateAtTime time: TimeInterval) {
            DispatchQueue.main.async {
            }

        }

        @objc func handleTap(gestureRecognize: UITapGestureRecognizer) {
            self.create()
        }

        func create() {
                // Get Screen Centre
                let screenCentre : CGPoint = CGPoint(x: self.sceneView.bounds.midX, y: self.sceneView.bounds.midY)

                let arHitTestResults : [ARHitTestResult] = sceneView.hitTest(screenCentre, types: [.featurePoint])

                if let closestResult = arHitTestResults.first {

                    // Get Coordinates of HitTest
                    let transform : matrix_float4x4 = closestResult.worldTransform

                    let worldCoord : SCNVector3 = SCNVector3Make(transform.columns.3.x, transform.columns.3.y, transform.columns.3.z)

                    // Create 3D Text
                    let node : SCNNode = createNewParentNode()
                    sceneView.scene.rootNode.addChildNode(node)
                    node.position = worldCoord
                }

            }

        func createNewParentNode(_ text : String) -> SCNNode {
                let text = SCNText(string: "Test", extrusionDepth: CGFloat(0.01))
                var font = UIFont(name: "Futura", size: 0.07)
                font = font?.withTraits(traits: .traitBold)
                text.font = font

                text.alignmentMode = kCAAlignmentCenter
                text.firstMaterial?.diffuse.contents = UIColor.orange
                text.firstMaterial?.specular.contents = UIColor.white
                text.firstMaterial?.isDoubleSided = true
                text.chamferRadius = CGFloat(bubbleDepth)

                let textNode = SCNNode(geometry: text)
               textNode.pivot = SCNMatrix4MakeTranslation( positionx, positiony, positionz) // Don't worry about the positions they work fine
                text.scale = SCNVector3Make(0.1, 0.1, 0.1)

                let NodeParent = SCNNode()
                NodeParent.addChildNode(text)

                //Add More SCNNode's to NodeParent

                return NodeParent

        }

}

extension UIFont {

    // Based on: 

    func withTraits(traits:UIFontDescriptorSymbolicTraits...) -> UIFont {
        let descriptor = self.fontDescriptor.withSymbolicTraits(UIFontDescriptorSymbolicTraits(traits))
        return UIFont(descriptor: descriptor!, size: 0)
    }
}

我不想必须将其添加为 SKLabelNode，因为我想稍后使用 Storyboard 进行集合视图。

跟我用的字体有关系吗？

Answer 1

SCNText - developer.apple.com

"SceneKit can create text geometry using any font and style supported by the Core Text framework, with the exception of bitmap fonts (such as those that define color emoji characters)".

但是，您仍然可以将表情符号放在 SCNNode（比如框）上，如 material/texture。

编辑： 几个月前，我使用表情符号创建了一个国家国旗 ios 应用程序，这是一个很好的演示 Youtube video - Country Flags iOS App

SCNText 不显示表情符号 - Swift 中的 ARKit

SCNText Not Displaying Emoji's - ARKit in Swift

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