AnimationClipPlayableを使いまわす

SomeAnimations.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Playables;
using UnityEngine.Animations;
using UnityEngine.Profiling;

public class LoopSomeAnimations : MonoBehaviour
{
	[SerializeField] AnimationClip[] clips = null;
	[SerializeField] float transitionTime = 0.3f;

	PlayableGraph graph;
	AnimationMixerPlayable mixer;
	AnimationClipPlayable prePlayable, currentPlayable;

	void Awake ()
	{
		graph = PlayableGraph.Create ();
	}

	void Start ()
	{
		// AnimationClipをMixerに登録
		currentPlayable = AnimationClipPlayable.Create (graph, clips [0]);
		mixer = AnimationMixerPlayable.Create (graph, 2, true);
		mixer.ConnectInput (0, currentPlayable, 0);
		mixer.SetInputWeight (0, 1);

		// outputにmixerとanimatorを登録して、再生
		var output = AnimationPlayableOutput.Create (graph, "output", GetComponent<Animator> ());
		output.SetSourcePlayable (mixer);
		graph.Play ();

		StartCoroutine (PlayAnimations ());
	}

	IEnumerator PlayAnimations ()
	{
		for (int i = 1; i < clips.Length; i++) {

			// アニメーションの時間だけ待つ
			yield return new WaitForSeconds (clips[i-1].length - transitionTime);

			// ClipPlayableを上書きは出来ない為、一旦mixerの1番と2番を一旦アンロード
			graph.Disconnect (mixer, 0);
			graph.Disconnect (mixer, 1);

			// 古いアニメーションを破棄し、次に再生するアニメーションを登録する
			if( prePlayable.IsValid())
				prePlayable.Destroy ();
			prePlayable = currentPlayable;
			currentPlayable = AnimationClipPlayable.Create (graph, clips [i]);
			mixer.ConnectInput (1, prePlayable, 0);
			mixer.ConnectInput (0, currentPlayable, 0);

			// 指定時間でアニメーションをブレンド
			float waitTime = Time.timeSinceLevelLoad + transitionTime; 
			yield return new WaitWhile (() => {
				var diff = waitTime - Time.timeSinceLevelLoad;
				if (diff <= 0) {
					mixer.SetInputWeight (1, 0);
					mixer.SetInputWeight (0, 1);
					return false;
				} else {
					var rate = Mathf.Clamp01 (diff / transitionTime);
					mixer.SetInputWeight (1, rate);
					mixer.SetInputWeight (0, 1 - rate);
					return true;
				}
			});
		}
	}

	void OnDestroy ()
	{
		graph.Destroy ();
	}
}