參考鏈接：

https://www.jianshu.com/p/56b56d80fbc8

https://www.jianshu.com/p/20801229717a

Timeline需要unity2017以上

1.點擊菜單欄Window/Sequencing/Timeline打開窗口

創建一個空物體，點擊“Create”，這時會創建一個.playable的資源，同時會為該物體掛上“PlayableDirector”和“Animator”組件，其中PlayableDirector是用來播放.playable文件的

2.將1個模型預制體拖到上面的Timeline根物體下，然后將模型預制體中帶有“Animator”組件的子物體拖到Track區域上，然后選擇Animation軌道

3.將該模型的動畫拖上去，運行游戲，這時Timeline的動畫會覆蓋模型動畫控制器的動畫，即播放的是Timeline的動畫

4.自定義擴展

PlayableBehaviour

 1 using UnityEngine;
 2 using UnityEngine.Playables;
 3 
 4 public class LightPlayableBehaviour : PlayableBehaviour
 5 {
 6     public Light light = null;
 7     public Color color = Color.white;
 8     public float intensity = 1f;
 9 
10     public override void OnGraphStart(Playable playable)
11     {
12         base.OnGraphStart(playable);
13         Debug.Log("OnGraphStart");
14     }
15 
16     public override void OnGraphStop(Playable playable)
17     {
18         base.OnGraphStop(playable);
19         Debug.Log("OnGraphStop");
20     }
21 
22     public override void OnBehaviourPlay(Playable playable, FrameData info)
23     {
24         base.OnBehaviourPlay(playable, info);
25         Debug.Log("OnBehaviourPlay");
26         light.color = color;
27         light.intensity = intensity;
28     }
29 
30     public override void OnBehaviourPause(Playable playable, FrameData info)
31     {
32         base.OnBehaviourPause(playable, info);
33         Debug.Log("OnBehaviourPause");
34         light.color = Color.white;
35         light.intensity = 1;
36     }
37 
38     public override void ProcessFrame(Playable playable, FrameData info, object playerData)
39     {
40         base.ProcessFrame(playable, info, playerData);
41         Debug.Log("ProcessFrame");
42     }
43 }

PlayableAsset

 1 using UnityEngine;
 2 using UnityEngine.Playables;
 3 
 4 public class LightPlayableAsset : PlayableAsset
 5 {
 6     public ExposedReference<Light> light;
 7     public Color color = Color.white;
 8     public float intensity = 1.0f;
 9 
10     public override Playable CreatePlayable(PlayableGraph graph, GameObject owner)
11     {
12         var scriptPlayable = ScriptPlayable<LightPlayableBehaviour>.Create(graph);
13         var behaviour = scriptPlayable.GetBehaviour();
14         behaviour.light = light.Resolve(graph.GetResolver());
15         behaviour.color = color;
16         behaviour.intensity = intensity;
17         return scriptPlayable;
18     }
19 }

如下，這樣就能創建自定義的PlayableAsset

選中該PlayableAsset，PlayableAsset腳本的作用是將面板的值賦給PlayableBehaviour；而PlayableBehaviour則是對這些值進行操作

執行順序：

OnGraphStart->OnBehaviourPause->OnBehaviourPlay->ProcessFrame->OnBehaviourPause->OnGraphStop

總結

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