SKVideoNode(嵌入在SKScene中)作为场景套件节点的纹理不工作

Question

我试图通过使用Scenekit将视频作为纹理映射到VR项目的原始圆柱体:嵌入在SKScene中的SKVideoNode作为Scenekit SCNTube对象的纹理，我只是无法将视频显示为静止图像。下面的PLayground代码应该生成映射到圆柱体的移动视频，但是映射不起作用:

编辑:在清单末尾增加了一行来修复。下面的代码应该可以工作

import UIKit
import SceneKit      // for 3D mapping
import SpriteKit     // for SKVideoNode
import QuartzCore    // for basic animation
import XCPlayground  // for live preview
import AVFoundation  // for video playback engine
// create a scene view with an empty scene
var sceneView = SCNView(frame: CGRect(x: 0, y: 0, width: 300, height: 300))
var scene = SCNScene()
sceneView.scene = scene

// start a live preview of that view
XCPShowView("The Scene View", view: sceneView)
// default lighting
sceneView.autoenablesDefaultLighting = true
// a geometry object
var tube = SCNTube(innerRadius: 1.99, outerRadius: 2, height: 3)
var tubeNode = SCNNode(geometry: tube)
scene.rootNode.addChildNode(tubeNode)
// video scene

let urlStr = NSBundle.mainBundle().pathForResource("sample", ofType: "mp4")
let url = NSURL(fileURLWithPath: urlStr!)
let asset = AVURLAsset(URL: url, options: nil)
let playerItem = AVPlayerItem(asset: asset)
let player = AVPlayer(playerItem: playerItem)
let videoNode = SKVideoNode(AVPlayer: player)
let spritescene = SKScene(size: CGSize(width: 1211, height: 431))

videoNode.size.width=spritescene.size.width
videoNode.size.height=spritescene.size.height
spritescene.addChild(videoNode)

// configure the geometry object
var myImage = UIImage.init(named: "BandImage.jpeg")
tube.firstMaterial?.diffuse.contents  = spritescene

// set a rotation axis (no angle) to be able to
// use a nicer keypath below and avoid needing
// to wrap it in an NSValue
tubeNode.rotation = SCNVector4(x: 0.0, y: 1.0, z: 0.0, w: 0.0)
// animate the rotation of the torus
var spin = CABasicAnimation(keyPath: "rotation.w") // only animate the angle
spin.toValue = 2.0*M_PI
spin.duration = 3
spin.repeatCount = HUGE // for infinity
tubeNode.addAnimation(spin, forKey: "spin around")
// starts the video, solving the issue
    sceneView.playing = true

Answer 1

我已经在github上发布了我的代码(和一些示例全景内容)，供任何想要工作示例代码或有兴趣在开源全景视频播放器上合作的人使用:

https://github.com/jglasse/OSVR

事实证明，看起来模拟器(和游乐场)不支持此功能。将上面的代码移动到一个项目并在设备上运行，我终于让它工作了。

所以这个故事的寓意是- 如果你使用SKVideoNodes作为Scenekit的纹理，请使用实际设备进行测试。