Unity3d 残影效果（狂拽炫酷叼炸天）

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

//残影特效，支持Mesh和SkinedMesh以及他俩组合
public class GhostEffect : MonoBehaviour
{
//如果让Mesh也带残影请保证Mesh的Read/Write是开启的
public bool IncludeMeshFilter = true;

//残影
public class GhostImange
{
public Mesh mesh;
public Material material;
public Matrix4x4 matrix;
public float duration;
public float time;
}

//材质
public Material EffectMaterial;

//总时长
public float Duration = 5;

//产生残影的间隔
public float Interval = 0.2f;

//残影淡出时间
public float FadeoutTime = 1;

private float mTime = 5;
private List<GhostImange> mImageList = new List<GhostImange>();

void Start()
{

}

[ContextMenu("Play")]
public void Play()
{
mTime = Duration;
StartCoroutine(AddImage());
}

IEnumerator AddImage()
{
while (mTime > 0)
{
CreateImage();
yield return new WaitForSeconds(Interval);
mTime -= Interval;
}
}

void CreateImage()
{
SkinnedMeshRenderer[] skinRenderers = GetComponentsInChildren<SkinnedMeshRenderer>();
MeshFilter[] filters = null;

int filtersCount = 0;

if (IncludeMeshFilter)
{
filters = GetComponentsInChildren<MeshFilter>();
filtersCount = filters.Length;
}

if (skinRenderers.Length+filtersCount <= 0)
{
return;
}

CombineInstance[] combineInstances = new CombineInstance[skinRenderers.Length + filtersCount];

int idx = 0;
for (int i = 0; i < skinRenderers.Length; i++)
{
var render = skinRenderers[i];

var mesh = new Mesh();
render.BakeMesh(mesh);

combineInstances[idx] = new CombineInstance
{
mesh = mesh,
transform = render.gameObject.transform.localToWorldMatrix,
subMeshIndex = 0
};

idx++;
}

for (int i = 0; i < filtersCount; i++)
{
var render = filters[i];

var temp = (null != render.sharedMesh) ? render.sharedMesh : render.mesh;
var mesh = (Mesh)Object.Instantiate(temp);
combineInstances[idx] = new CombineInstance
{
mesh = mesh,
transform = render.gameObject.transform.localToWorldMatrix,
subMeshIndex = 0
};

idx++;
}

Mesh combinedMesh = new Mesh();
combinedMesh.CombineMeshes(combineInstances, true, true);

mImageList.Add(new GhostImange
{
mesh = combinedMesh,
material = new Material(EffectMaterial),
time = FadeoutTime,
duration = FadeoutTime,
});
}

void LateUpdate()
{

bool needRemove = false;

foreach (var image in mImageList)
{
image.time -= Time.deltaTime;
if (image.material.HasProperty("_Color"))
{
Color color = Color.white;
color.a = Mathf.Max(0, image.time / image.duration);
image.material.SetColor("_Color", color);
}

Graphics.DrawMesh(image.mesh, Matrix4x4.identity, image.material, gameObject.layer);
if(image.time<=0)
{
needRemove = true;
}
}

if (needRemove)
{
mImageList.RemoveAll(x => x.time <= 0);
}
}

}