稼働中のアニメーションコントローラーにAnimationClipPlayableを混ぜる

BlendAnimationController2Playable.cs

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

[RequireComponent(typeof(Animator))]
public class BlendAnimationController2Playable : MonoBehaviour 
{
	private PlayableGraph graph, animControlGraph;
	private AnimationPlayableOutput output;

	[SerializeField] AnimationClip clip = null;

	void Awake()
	{
		// AnimationControllerのPlayableGraphは既に稼働しているので、新しく作る
		graph = PlayableGraph.Create ();

		// アニメーション再生の出力先を登録
		var animator = GetComponent<Animator> ();
		output = AnimationPlayableOutput.Create (graph, name, animator);
		output.SetSourcePlayable (AnimationClipPlayable.Create (graph, clip));

		// AnimationController側の操作用にキャッシュしとく
		animControlGraph = animator.playableGraph;
	}

	void OnDestroy()
	{
		// PlayableGraphは必ず破棄する
		graph.Destroy ();
	}

	public void SetWeight(float value)
	{
		// AnimationControllerがフルに動いてる時はPlayableGraphは停止させる
		if (value == 0) {
			graph.Stop ();
		} else if( graph.IsPlaying() == false){
			graph.Play ();
		}

		// Playable Graphがフルに動いてる時はAnimationControllerは停止させる
		if (value == 1) {
			animControlGraph.Stop ();
		} else if (animControlGraph.IsPlaying () == false)  {
			animControlGraph.Play ();
		}
		// PlayableGraphのブレンド率
		output.SetWeight (value);
	}
}