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残影特效在网上有很多例子，比如 这个，我参考着自己整合了一下，算是整合了一个比较完整且特别简单易用的出来，只需要一个脚本挂上去无需任何设定就能用。
这里只针对SkinnedMeshRenderer的网格（也就是带蒙皮的网格）残影，主要原理是根据设定的间隔时间连续的截取当前SkinnedMeshRenderer的网格数据并使用Graphics.DrawMesh画出网格。
一、首先是我们的残影类，为了能及时的Destroy，所以它最好派生至Object：
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class AfterImage : Object{ //残影网格 public Mesh _Mesh; //残影纹理 public Material _Material; //残影位置 public Matrix4x4 _Matrix; //残影透明度 public float _Alpha; //残影启动时间 public float _StartTime; //残影保留时间 public float _Duration; public AfterImage(Mesh mesh, Material material, Matrix4x4 matrix4x4, float alpha, float startTime, float duration) { _Mesh = mesh; _Material = material; _Matrix = matrix4x4; _Alpha = alpha; _StartTime = startTime; _Duration = duration; }}1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.属性描述：残影从创建之时起便记录《残影启动时间》，当其生命周期达到或者超过了设定的《残影保留时间》时，该残影即被清除；《残影网格》为残影创建之时从SkinnedMeshRenderer截取而来，保留有当前SkinnedMeshRenderer的网格数据，并依据设定的《残影纹理》在《残影位置》以《残影透明度》DrawMesh。
二、我们再定义一个残影特效类来管理残影：
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using UnityEngine;using System.Collections;using System.Collections.Generic;/// <summary>/// 残影特效/// </summary>public class AfterImageEffects : MonoBehaviour { //开启残影 public bool _OpenAfterImage; //残影颜色 public Color _AfterImageColor = Color.black; //残影的生存时间 public float _SurvivalTime = 1; //生成残影的间隔时间 public float _IntervalTime = 0.2f; private float _Time = 0; //残影初始透明度 [Range(0.1f, 1.0f)] public float _InitialAlpha = 1.0f; private List<AfterImage> _AfterImageList; private SkinnedMeshRenderer _SkinnedMeshRenderer; void Awake () { _AfterImageList = new List<AfterImage>(); _SkinnedMeshRenderer = GetComponent<SkinnedMeshRenderer>(); } void Update () { if (_OpenAfterImage && _AfterImageList != null) { if (_SkinnedMeshRenderer == null) { _OpenAfterImage = false; return; } _Time += Time.deltaTime; //生成残影 CreateAfterImage(); //刷新残影 UpdateAfterImage(); } }}1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.42.43.44.45.46.属性描述：《残影的生存时间》为每个残影从创建开始到销毁经历的时间，《生成残影的间隔时间》为残影创建后到下一个残影创建的时间，每个残影都会从《初始透明度》逐渐变化到0透明度并销毁。
生成残影：
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/// <summary> /// 生成残影 /// </summary> void CreateAfterImage() { //生成残影 if (_Time >= _IntervalTime) { _Time = 0; Mesh mesh = new Mesh(); _SkinnedMeshRenderer.BakeMesh(mesh); Material material = new Material(_SkinnedMeshRenderer.material); SetMaterialRenderingMode(material, RenderingMode.Fade); _AfterImageList.Add(new AfterImage( mesh, material, transform.localToWorldMatrix, _InitialAlpha, Time.realtimeSinceStartup, _SurvivalTime)); } }1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.刷新残影：
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/// <summary> /// 刷新残影 /// </summary> void UpdateAfterImage() { //刷新残影，根据生存时间销毁已过时的残影 for (int i = 0; i < _AfterImageList.Count; i++) { float _PassingTime = Time.realtimeSinceStartup - _AfterImageList[i]._StartTime; if (_PassingTime > _AfterImageList[i]._Duration) { _AfterImageList.Remove(_AfterImageList[i]); Destroy(_AfterImageList[i]); continue; } if (_AfterImageList[i]._Material.HasProperty("_Color")) { _AfterImageList[i]._Alpha *= (1 - _PassingTime / _AfterImageList[i]._Duration); _AfterImageColor.a = _AfterImageList[i]._Alpha; _AfterImageList[i]._Material.SetColor("_Color", _AfterImageColor); } Graphics.DrawMesh(_AfterImageList[i]._Mesh, _AfterImageList[i]._Matrix, _AfterImageList[i]._Material, gameObject.layer); } }1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.残影存在透明通道，所以必须要设置纹理的渲染模式为fade模式：
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/// <summary> /// 设置纹理渲染模式 /// </summary> void SetMaterialRenderingMode(Material material, RenderingMode renderingMode) { switch (renderingMode) { case RenderingMode.Opaque: material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One); material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero); material.SetInt("_ZWrite", 1); material.DisableKeyword("_ALPHATEST_ON"); material.DisableKeyword("_ALPHABLEND_ON"); material.DisableKeyword("_ALPHAPREMULTIPLY_ON"); material.renderQueue = -1; break; case RenderingMode.Cutout: material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One); material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero); material.SetInt("_ZWrite", 1); material.EnableKeyword("_ALPHATEST_ON"); material.DisableKeyword("_ALPHABLEND_ON"); material.DisableKeyword("_ALPHAPREMULTIPLY_ON"); material.renderQueue = 2450; break; case RenderingMode.Fade: material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha); material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha); material.SetInt("_ZWrite", 0); material.DisableKeyword("_ALPHATEST_ON"); material.EnableKeyword("_ALPHABLEND_ON"); material.DisableKeyword("_ALPHAPREMULTIPLY_ON"); material.renderQueue = 3000; break; case RenderingMode.Transparent: material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One); material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha); material.SetInt("_ZWrite", 0); material.DisableKeyword("_ALPHATEST_ON"); material.DisableKeyword("_ALPHABLEND_ON"); material.EnableKeyword("_ALPHAPREMULTIPLY_ON"); material.renderQueue = 3000; break; } }1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.42.43.44.45.三、效果图如下：
四、我将完整的源码贴一遍，只需要新建一个脚本AfterImageEffects，复制以下源码到其中，然后挂在有SkinnedMeshRenderer组件的模型上，并勾选OpenAfterImage，运行便可以看到效果：
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using UnityEngine;using System.Collections;using System.Collections.Generic;/// <summary>/// 残影特效/// </summary>public class AfterImageEffects : MonoBehaviour { //开启残影 public bool _OpenAfterImage; //残影颜色 public Color _AfterImageColor = Color.black; //残影的生存时间 public float _SurvivalTime = 1; //生成残影的间隔时间 public float _IntervalTime = 0.2f; private float _Time = 0; //残影初始透明度 [Range(0.1f, 1.0f)] public float _InitialAlpha = 1.0f; private List<AfterImage> _AfterImageList; private SkinnedMeshRenderer _SkinnedMeshRenderer; void Awake () { _AfterImageList = new List<AfterImage>(); _SkinnedMeshRenderer = GetComponent<SkinnedMeshRenderer>(); } void Update () { if (_OpenAfterImage && _AfterImageList != null) { if (_SkinnedMeshRenderer == null) { _OpenAfterImage = false; return; } _Time += Time.deltaTime; //生成残影 CreateAfterImage(); //刷新残影 UpdateAfterImage(); } } /// <summary> /// 生成残影 /// </summary> void CreateAfterImage() { //生成残影 if (_Time >= _IntervalTime) { _Time = 0; Mesh mesh = new Mesh(); _SkinnedMeshRenderer.BakeMesh(mesh); Material material = new Material(_SkinnedMeshRenderer.material); SetMaterialRenderingMode(material, RenderingMode.Fade); _AfterImageList.Add(new AfterImage( mesh, material, transform.localToWorldMatrix, _InitialAlpha, Time.realtimeSinceStartup, _SurvivalTime)); } } /// <summary> /// 刷新残影 /// </summary> void UpdateAfterImage() { //刷新残影，根据生存时间销毁已过时的残影 for (int i = 0; i < _AfterImageList.Count; i++) { float _PassingTime = Time.realtimeSinceStartup - _AfterImageList[i]._StartTime; if (_PassingTime > _AfterImageList[i]._Duration) { _AfterImageList.Remove(_AfterImageList[i]); Destroy(_AfterImageList[i]); continue; } if (_AfterImageList[i]._Material.HasProperty("_Color")) { _AfterImageList[i]._Alpha *= (1 - _PassingTime / _AfterImageList[i]._Duration); _AfterImageColor.a = _AfterImageList[i]._Alpha; _AfterImageList[i]._Material.SetColor("_Color", _AfterImageColor); } Graphics.DrawMesh(_AfterImageList[i]._Mesh, _AfterImageList[i]._Matrix, _AfterImageList[i]._Material, gameObject.layer); } } /// <summary> /// 设置纹理渲染模式 /// </summary> void SetMaterialRenderingMode(Material material, RenderingMode renderingMode) { switch (renderingMode) { case RenderingMode.Opaque: material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One); material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero); material.SetInt("_ZWrite", 1); material.DisableKeyword("_ALPHATEST_ON"); material.DisableKeyword("_ALPHABLEND_ON"); material.DisableKeyword("_ALPHAPREMULTIPLY_ON"); material.renderQueue = -1; break; case RenderingMode.Cutout: material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One); material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero); material.SetInt("_ZWrite", 1); material.EnableKeyword("_ALPHATEST_ON"); material.DisableKeyword("_ALPHABLEND_ON"); material.DisableKeyword("_ALPHAPREMULTIPLY_ON"); material.renderQueue = 2450; break; case RenderingMode.Fade: material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha); material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha); material.SetInt("_ZWrite", 0); material.DisableKeyword("_ALPHATEST_ON"); material.EnableKeyword("_ALPHABLEND_ON"); material.DisableKeyword("_ALPHAPREMULTIPLY_ON"); material.renderQueue = 3000; break; case RenderingMode.Transparent: material.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.One); material.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha); material.SetInt("_ZWrite", 0); material.DisableKeyword("_ALPHATEST_ON"); material.DisableKeyword("_ALPHABLEND_ON"); material.EnableKeyword("_ALPHAPREMULTIPLY_ON"); material.renderQueue = 3000; break; } }}public enum RenderingMode{ Opaque, Cutout, Fade, Transparent,}class AfterImage : Object{ //残影网格 public Mesh _Mesh; //残影纹理 public Material _Material; //残影位置 public Matrix4x4 _Matrix; //残影透明度 public float _Alpha; //残影启动时间 public float _StartTime; //残影保留时间 public float _Duration; public AfterImage(Mesh mesh, Material material, Matrix4x4 matrix4x4, float alpha, float startTime, float duration) { _Mesh = mesh; _Material = material; _Matrix = matrix4x4; _Alpha = alpha; _StartTime = startTime; _Duration = duration; }}1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.42.43.44.45.46.47.48.49.50.51.52.53.54.55.56.57.58.59.60.61.62.63.64.65.66.67.68.69.70.71.72.73.74.75.76.77.78.79.80.81.82.83.84.85.86.87.88.89.90.91.92.93.94.95.96.97.98.99.100.101.102.103.104.105.106.107.108.109.110.111.112.113.114.115.116.117.118.119.120.121.122.123.124.125.126.127.128.129.130.131.132.133.134.135.136.137.138.139.140.141.142.143.144.145.146.147.148.149.150.151.152.153.154.155.156.157.158.159.160.161.162.163.164.165.166.167.168.169.170.171.172.173.174.175.免责声明：本文系网络转载或改编，未找到原创作者，版权归原作者所有。如涉及版权，请联系删
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