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：一个嵌入在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会.下面的PLayground代码应生成映射到柱面的移动视频,但映射不起作用：
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
