UnityのタイムラインでライティングのAmbientColorを変えれるやつ

SkyColorChangeAsset.cs

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

public class SkyColorChangeAsset : PlayableAsset
{
    [SerializeField] public Color startColor;
    [SerializeField] public Color endColor;
    
    public override Playable CreatePlayable(PlayableGraph graph, GameObject gameObject)
    {
        SkyColorChangeBehaviour behaviour = new SkyColorChangeBehaviour();
        behaviour.startColor = startColor;
        behaviour.endColor = endColor;

        return ScriptPlayable<SkyColorChangeBehaviour>.Create(graph, behaviour);
    }
}

SkyColorChangeBehaviour.cs

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

[System.Serializable]
public class SkyColorChangeBehaviour : PlayableBehaviour
{
    public Color startColor;
    public Color endColor;

    private float _startTime;
    private float _duration;

    public override void OnGraphStart(Playable playable)
    {
        _duration = (float) playable.GetDuration();
    }
    
    public override void OnBehaviourPlay(Playable playable, FrameData info)
    {
        _startTime = Time.time;
    }

    public override void PrepareFrame(Playable playable, FrameData info)
    {
        float t = (Time.time - _startTime) / _duration;
        RenderSettings.ambientLight = Color.Lerp(startColor, endColor, t);
        Debug.Log(RenderSettings.ambientLight);
    }

}