ios - SKVideoNode 仅在节点或相机移动时在 SCNScene 中渲染

Question

我正在使用一种非常简单的方法来设置 SKVideoNode 并通过几何体的漫反射内容将其放置在 SCNNode 中。当我这样做时，唯一纹理更新和正确显示视频的时间是相机或节点移动时。当两者都静止时，纹理永远不会更新(就像视频甚至没有播放一样)但声音会播放。

显然它仍在播放视频，但渲染不正确。我不知道为什么。

func setupAndPlay() {

    // create the asset & player and grab the dimensions
    let path = NSBundle.mainBundle().pathForResource("indycar", ofType: "m4v")!
    let asset = AVAsset(URL: NSURL(fileURLWithPath: path))
    let size = asset.tracksWithMediaType(AVMediaTypeVideo)[0].naturalSize

    let player = AVPlayer(playerItem: AVPlayerItem(asset: asset))

    // setup the video SKVideoNode
    let videoNode = SKVideoNode(AVPlayer: player)
    videoNode.size = size
    videoNode.position = CGPoint(x: size.width * 0.5, y: size.height * 0.5)

    // setup the SKScene that will house the video node
    let videoScene = SKScene(size: size)
    videoScene.addChild(videoNode)

    // create a wrapper ** note that the geometry doesn't matter, it happens with spheres and planes
    let videoWrapperNode = SCNNode(geometry: SCNSphere(radius: 10))
    videoWrapperNode.position = SCNVector3(x: 0, y: 0, z: 0)

    // set the material's diffuse contents to be the video scene we created above
    videoWrapperNode.geometry?.firstMaterial?.diffuse.contents = videoScene
    videoWrapperNode.geometry?.firstMaterial?.doubleSided = true

    // reorient the video properly
    videoWrapperNode.scale.y = -1
    videoWrapperNode.scale.z = -1

    // add it to our scene
    scene.rootNode.addChildNode(videoWrapperNode)

    // if I uncomment this, the video plays correctly; if i comment it, the texture on the videoWrapperNode only 
    // get updated when I'm moving the camera around. the sound always plays properly.
    videoWrapperNode.runAction( SCNAction.repeatActionForever( SCNAction.rotateByAngle(CGFloat(M_PI * 2.0), aroundAxis: SCNVector3(x: 0, y: 1, z: 0), duration: 15.0 )))

    videoNode.play()
}

有没有人遇到过类似的事情？任何帮助将不胜感激。

Answer 1

听起来您需要在 SCNView 上设置 .playing = true。

来自docs .

If the value of this property is NO (the default), SceneKit does not increment the scene time, so animations associated with the scene do not play. Change this property’s value to YES to start animating the scene.