【Unity】创建自定义Playable，使用Timeline控制Particle System的参数

Timeline功能强大，但可控的参数还是较少，官方提供了自定义编写Playable的方法，用于扩展Timeline，使其更加强大。

上一篇我们介绍了一些官方发布到Asset Store上的免费Playable，我们以其为模板，创建自己的Playable。

官方的例子提供了控制Text，Light，等。我们来尝试控制下Particle，粒子系统。

根据这个模板，我们可以进行扩展，进而可以使用Timeline控制粒子系统的任意参数

本篇目标：

通过Timeline控制粒子系统的StartColor，即

我们需要创建如下五个脚本

Drawer用来绘制，ParticleClip在Inspector中的颜色块，粒子将会根据这个颜色块更改颜色

在ParticleBehaivour中，定义要更改的变量

几个脚本的代码内容如下：

ParticleBehaivour：

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Playables;[Serializable]
public class ParticleBehaviour : PlayableBehaviour
{public Color p_startColor = Color.white;
}

ParticleClip.cs：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Timeline;
using UnityEngine.Playables;
using System;[Serializable]
public class ParticleClip : PlayableAsset , ITimelineClipAsset
{public ParticleBehaviour templete = new ParticleBehaviour();public ClipCaps clipCaps {get { return ClipCaps.Blending; }}public override Playable CreatePlayable(PlayableGraph graph, GameObject owner) {var playable = ScriptPlayable<ParticleBehaviour>.Create(graph, templete);return playable;}
}

ParticleMixerBehviour.cs:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Playables;public class ParticleMixerBehviour : PlayableBehaviour
{Color m_DefaultColor;ParticleSystem m_TrackBinding;bool m_firstFrameHappened;public override void ProcessFrame(Playable playable, FrameData info, object playerData) {m_TrackBinding = playerData as ParticleSystem;if (m_TrackBinding == null)return;if (!m_firstFrameHappened) {//var p_main = m_TrackBinding.main;m_DefaultColor = p_main.startColor.color;m_firstFrameHappened = true;}int inputCount = playable.GetInputCount();Color blendedColor = Color.clear;float totalWeight = 0f;float greatestWeight = 0f;int currentInputs = 0;for(int i = 0; i < inputCount; i++) {float inputWeight = playable.GetInputWeight(i);ScriptPlayable<ParticleBehaviour> inputPlayable = (ScriptPlayable<ParticleBehaviour>)playable.GetInput(i);ParticleBehaviour input = inputPlayable.GetBehaviour();blendedColor += input.p_startColor * inputWeight;totalWeight += inputWeight;if (inputWeight > greatestWeight) {greatestWeight = inputWeight;}if (!Mathf.Approximately(inputWeight, 0))currentInputs++;}var main = m_TrackBinding.main;main.startColor = blendedColor + m_DefaultColor * (1f - totalWeight);}public override void OnPlayableDestroy(Playable playable) {m_firstFrameHappened = false;if (m_TrackBinding == null)return;var main = m_TrackBinding.main;main.startColor = m_DefaultColor;}}

ParticleTrack.cs:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Playables;
using UnityEngine.Timeline;[TrackColor(0.35f,0.97f,0.64f)]
[TrackClipType(typeof(ParticleClip))]
[TrackBindingType(typeof(ParticleSystem))]
public class ParticleTrack : TrackAsset
{public override Playable CreateTrackMixer(PlayableGraph graph, GameObject go, int inputCount) {return ScriptPlayable<ParticleMixerBehviour>.Create(graph, inputCount);}public override void GatherProperties(PlayableDirector director, IPropertyCollector driver) {
#if UNITY_EDITORParticleSystem trackBinding = director.GetGenericBinding(this) as ParticleSystem;if (trackBinding == null)return;var serializedObject = new UnityEditor.SerializedObject(trackBinding);var iterator = serializedObject.GetIterator();while (iterator.NextVisible(true)) {if (iterator.hasVisibleChildren)continue;//driver.AddFromName<ParticleSystem>(trackBinding.gameObject, iterator.propertyPath);}
#endifbase.GatherProperties(director, driver);}
}

ParticleDrawer.cs:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;[CustomPropertyDrawer(typeof(ParticleBehaviour))]
public class ParticleDrawer : PropertyDrawer
{public override float GetPropertyHeight(SerializedProperty property, GUIContent label) {int fieldCount = 1;return fieldCount * EditorGUIUtility.singleLineHeight;}public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) {SerializedProperty colorProp = property.FindPropertyRelative("p_startColor");Rect singleFieldRect = new Rect(position.x, position.y, position.width, EditorGUIUtility.singleLineHeight);EditorGUI.PropertyField(singleFieldRect, colorProp);}
}

创建如上脚本，粘贴以上代码，即可在Timeline中创建相应轨道。拖拽任意物体到Timeline中，也可创建Particle轨道

源码在这：

https://download.csdn.net/download/u011643463/11268727

同篇笔记（这里也能下到源码，万恶资本主义，我没法在本站上传0积分资源）

http://note.youdao.com/noteshare?id=28beb40d88f30e41af212c72e8de1d8f&sub=432815D8787545BB9FE0B1E57067AB99

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【Unity】创建自定义Playable，使用Timeline控制Particle System的参数

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