自分がUnity Timelineのカスタムクリップを作るときに使いたいTrack、Mixerを含むテンプレート

概要

UnityのTimelineでカスタムクリップを作るときにAnimationKeyが使えてMixerで制御する前提のテンプレートです。
webの記事ではClipとPlayableBehaviourまではでてきますが、Track、Mixerまであまり出てこないのですべて含めてシンプルにまとめました。

Clip

ExampleClip.cs

using System;
using UnityEngine;
using UnityEngine.Playables;

[Serializable]
public class ExampleClip : PlayableAsset
{
    public ExamplePlayableBehaviour behaviour = new ExamplePlayableBehaviour();
    
    public override Playable CreatePlayable(PlayableGraph graph, GameObject go)
    {
        ScriptPlayable<ExamplePlayableBehaviour> playable =
            ScriptPlayable<ExamplePlayableBehaviour>.Create(graph, behaviour);
        return playable;
    }
}

PlayableBehaviour

ExamplePlayableBehaviour.cs

using System;
using UnityEngine.Playables;

[Serializable]
public class ExamplePlayableBehaviour : PlayableBehaviour
{
    public float SampleValue;
}

Mixer

ExampleMixer.cs

using UnityEngine;
using UnityEngine.Playables;

public class ExampleMixer : PlayableBehaviour
{
    public override void ProcessFrame(Playable playable, FrameData info, object playerData)
    {
        float value = 0.0f;
        for (int i = 0; i < playable.GetInputCount(); i++)
        {
            var sp = (ScriptPlayable<ExamplePlayableBehaviour>)playable.GetInput(i);
            var behaviour = sp.GetBehaviour();
            var weight = playable.GetInputWeight(i);
            value += behaviour.SampleValue * weight;
        }
        Debug.Log($"SampleValie:{value}");
    }
}

Track

ExampleTrack.cs

using UnityEngine;
using UnityEngine.Playables;
using UnityEngine.Timeline;

[TrackClipType(typeof(ExampleClip))]
public class ExampleTrack : TrackAsset
{
    public override Playable CreateTrackMixer(PlayableGraph graph, GameObject go, int inputCount)
    {
        return ScriptPlayable<ExampleMixer>.Create(graph, inputCount);
    }
}