SceneKit - 提供两种最常用的将序列帧动画渲染到模型上的方式

    // 第一步 - 创建动画组
    var images :[UIImage] = []
    for i in 1...10 {
       let name = "\(i).tiff"
       images.append(UIImage(named:name)!)
    }
    
    // 第二步  给模型节点添加行为动画
    var count = 0
    let action = SCNAction.customAction(duration: 0.1) { (node, progress) in
       print(progress)
        if progress >= 0.1 {
           count += 1
           node.geometry?.firstMaterial?.diffuse.contents = images[count%9]
        }
    }
   // 让行为持续 长一点 就能实现连贯的动画
    planeNode.runAction( SCNAction.repeat(action, count: 1000))

0.00141505610443735
0.0180852222157303
0.0347495143823253
0.0513938077001841
0.0681048463002569
0.084751595329517
0.100000001490116 // 是一个> 0.1 的值有误差范围

    // 第一步 创建持有动画的imageView
    let imageView = UIImageView()
    imageView.frame = CGRect(x: 0, y: 0, width: 200, height: 200)
    var images :[UIImage] = []
    for i in 1...10 {
     let name = "\(i).tiff"
     images.append(UIImage(named:name)!)
    }
    imageView.animationImages = images
    imageView.animationDuration = 1
    imageView.animationRepeatCount = -1
    imageView.startAnimating()
    // 第二步 渲染imageView 到模型上去
    planeNode.geometry?.firstMaterial?.diffuse.contents = imageView

  scnView.isPlaying = true