Question

我使用代码在RealityKit中添加图片纹理，并且效果很好。

var material = SimpleMaterial()

material.baseColor = try! .texture(.load(named: "image.jpg"))

我尝试使用此代码将视频文件添加为纹理，但是它崩溃了！

guard let url = Bundle.main.url(forResource: "data", withExtension: "mp4") else {
            return
        }

        material.baseColor = try! .texture(.load(contentsOf: url))

如何添加视频文件？

Answer 1

您只能在RealityKit 2.0中使用video textures（需要具有iOS 14目标的Xcode 12）。 RealityKit的早期版本不支持视频资料。

以下代码向您展示如何应用它：

import AVKit
import RealityKit

@IBOutlet var arView: ARView!

// AVPLAYER
guard let pathToVideo = Bundle.main.path(forResource: "video", ofType: "mp4") 
else { 
    return 
}
let videoURL = URL(fileURLWithPath: pathToVideo)
let avPlayer = AVPlayer(url: videoURL)

// ENTITY
let mesh = MeshResource.generatePlane(width: 1.92, depth: 1.08)    // 16:9 video
let material = VideoMaterial(avPlayer: avPlayer)
let planeEntity = ModelEntity(mesh: mesh, materials: [material])

// ANCHOR
let anchor = AnchorEntity(.plane(.vertical,
                            classification: .wall,
                             minimumBounds: [0.3, 0.3])
anchor.addChild(planeEntity)
arView.scene.anchors.append(anchor)

// PLAYBACK
avPlayer.play()

此外，您可以通过以下方式添加VideoMaterial：

// AVPLAYER and PlayerItem
let url = Bundle.main.url(forResource: "aaa",
                        withExtension: "mp4")
let asset = AVAsset(url: url!)
let playerItem = AVPlayerItem(asset: asset)
let avPlayer = AVPlayer()
    
// ENTITY
let mesh = MeshResource.generateSphere(radius: 1)
let material = VideoMaterial(avPlayer: avPlayer)
let entity = ModelEntity(mesh: mesh, materials: [material])
    
// ANCHOR
let anchor = AnchorEntity(world: [0,0,-10])
anchor.addChild(entity)
arView.scene.anchors.append(anchor)
    
// PLAYBACK
avPlayer.replaceCurrentItem(with: playerItem)
avPlayer.play()

Answer 2

我可能是错的，但目前RealityKit不支持视频。视频不是普通的纹理，而是一组动画纹理。

Answer 3

我找到了解决方法，例如下面的代码

self.arView = arView
let scene = SCNScene()
scnView = SCNView(frame: arView.frame)
scnView?.scene = scene
scnView?.backgroundColor = UIColor.clear
scnView?.scene?.background.contents = UIColor.clear

然后添加SCN摄像机并从ARFrame设置摄像机变换，例如：

let rotation = SCNMatrix4MakeRotation(.pi / 2.0, 0, 0, 1)
        let cameraTransform = simd_mul(frame.camera.transform, simd_float4x4(rotation))

let projectionMatrix = SCNMatrix4(frame.camera.projectionMatrix(for: .portrait,
                                                                         viewportSize: self.viewBounds!.size,
                                                                         zNear: 0.001,
                                                                         zFar: 10000) )
self.arCameraNode?.simdTransform = cameraTransform
self.arCameraNode?.camera?.projectionTransform = projectionMatrix

最后，将SCN视频节点添加到rootNode
但是，有一点变化，我认为您可以等待Realitykit支持视频材料。

如何在RealityKit中将视频资料添加到ModelEntity

3 个答案: