Effect（二）—— fyDragRibbon

目录为：Assets/Scripts/Effect/fyParticleSystem/目录下
fyDragRibbon.cs

继承fyRibbonTrail，暂时看不到怎么使用.
代码如下：

using UnityEngine;using System.Collections.Generic;//编辑器模式就执行，一般的只有在playmode才会执行[ExecuteInEditMode]//拖曳丝带效果public class fyDragRibbon: fyRibbonTrail{    //前进速度    public float mSpeed1 = 2.0f;    //回退速度    public float mSpeed2 = 2.0f;    //最长距离    public float mMaxLength = 10;    //激活    public bool mEnable = false;    //强制回退    public bool mForceBack = false;    //朝向    //朝向z轴正半轴    public Vector3 mDir = new Vector3 (0, 0, 1);    //当前经过长度    public float mCurLength = 0;    //前进还是回退    public bool mIsAdvance = true;    //源目标对象    Transform mSourceTM;    //绑定节点    Transform mBindTM;    public fyDragRibbon()    {    }    //重写ReCreate    public override void ReCreate()    {        //调用父类ReCreate        base.ReCreate ();        renderObj.name = "fyDragRibbon";        //创建一个绑定节点        mBindTM = renderObj.transform.FindChild ("BindObj");        if (mBindTM == null)        {            GameObject bindObj = new GameObject ("BindObj");            bindObj.transform.parent = renderObj.transform;            mBindTM = bindObj.transform;        }        mBindTM.LookAt (mBindTM.position + mDir);    }    //功能函数    public void Link(Transform sourceObj)    {        if (sourceObj == null)        {            return;        }        //绑定源目标对象        mSourceTM = sourceObj;        mEnable = true;    }    //强制回退    public void ForceBack()    {        if (mEnable)        {            mForceBack = true;        }    }    //继承而来    public override void UpdateRibbon(float deltaTime)    {        //未创建或未连接        if (!bCreated || !mEnable || mMesh == null)        {            return;        }        //以主camera为中心        mMesh.bounds = new Bounds (Camera.main.transform.position, new Vector3 (1000, 1000, 1000));        //源目标位置        Vector3 sourcePos = mSourceTM.position;        //前进        if (mIsAdvance)        {            mCurLength += mSpeed1 * deltaTime;        }        else        {            mCurLength -= mSpeed2 * deltaTime;        }        //到达最大位置        if (mForceBack || mCurLength >= mMaxLength)        {            mIsAdvance = false;        }        //是否回退结束        if (mCurLength <= 0)        {            mCurLength = 0;            mEnable = false;            mIsAdvance = true;            mForceBack = false;            gameObject.SetActive (false);            return;        }        //计算当前目标点        Vector3 targetPos = sourcePos + mDir * mCurLength;        mBindTM.position = targetPos;        float totalDist = 0;        //遍历修改数据点        for (int i = 0; i < elemPosPool.Length / 2.0f; i++)        {            float vLength = i * segLength;            vLength = vLength < mCurLength ? vLength : mCurLength;            if (mCurLength >= mMaxLength)            {                totalDist = mMaxLength;            }            else            {                totalDist = mCurLength;            }            //最终中心位置            Vector3 vPos = targetPos - mDir * vLength;            //垂直法向            Vector3 vDir = Vector3.Cross (mDir, mNormal);            Vector3 p1 = vPos + vDir * segWidth / 2.0f;            Vector3 p2 = vPos - vDir * segWidth / 2.0f;            //转为局部坐标            //p1 -= sourcePos;            //p2 -= sourcePos;            //重置顶点数据            elemPosPool [i * 2] = p1;            elemPosPool [i * 2 + 1] = p2;            if (mMaterialType == MaterialAddressType.Repeat_Type)            {                float uv = vLength / mUVLength;                elemUVPool [i * 2] = new Vector2 (-uv, 1.0f);                elemUVPool [i * 2 + 1] = new Vector2 (-uv, 0.0f);            }            else            {                elemUVPool [i * 2] = new Vector2 (1.0f - vLength / totalDist, 1.0f);                elemUVPool [i * 2 + 1] = new Vector2 (1.0f - vLength / totalDist, 0.0f);            }        }        mMesh.vertices = elemPosPool;        mMesh.uv = elemUVPool;    }    public override void Reset()    {        base.Reset ();        mCurLength = 0;        mEnable = false;        mIsAdvance = true;        mForceBack = false;    }}