《魔兽世界》，本人最喜欢的网络游戏，如果你玩过战士，你一定对战士的冲锋非常熟悉，现在接触 Unity3D，因为最近用到了刀光、拖尾特效，所以就想做一个类似战士的冲锋效果，在本场景用到的拖尾效果可以查看我的另一篇文章，里面有详细的介绍，刀光效果来自 Unity3D Assets 商店，只是把原作者的例子代码整理了一下，变得非常简单实用的类。
最终效果如下：
先来搭建我们的场景，如图：
然后给角色的模型添加一个空对象，并且加上 MeshRender，并且设置好材质为 WeaponTrail，另外给这个空对象添加 WeaponTrail.cs 对象，设置好相关属性，如图：
下面的代码是修改另一篇文章的 TrailsBladeMaster.cs 类，新的代码如下：
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
[AddComponentMenu("PocketRPG/Blade Master")]
public class TrailsBladeMaster : MonoBehaviour
{
/// <summary>
/// 拖尾效果
/// </summary>
public WeaponTrail weaponSwipe;
public AnimationClip idleClip;
public AnimationClip runClip;
/// <summary>
/// 移动速度
/// </summary>
public float speed = 20.0f;
public Camera mainCamera;
private Animation animation;
protected TrailsAnimationController animationController;
protected CharacterController characterController;
/// <summary>
/// 运行状态
/// </summary>
private bool isMoving = false;
/// <summary>
/// 目标位置
/// </summary>
private Vector3 targetPosition;
/// <summary>
/// 移动向量
/// </summary>
private Vector3 moveDirection;
protected void Awake ()
{
this.animation = this.GetComponent<Animation> ();
this.animationController = this.GetComponent<TrailsAnimationController> ();
this.characterController = this.GetComponent<CharacterController> ();
this.animation.CrossFade (this.idleClip.name);
}
protected void Start ()
{
if (this.weaponSwipe != null) this.animationController.AddTrail (this.weaponSwipe);
}
protected void Update ()
{
if (!this.isMoving && Input.GetMouseButtonDown(0))
{
this.targetPosition = this.GetWorldPosition();
if(this.targetPosition != Vector3.zero)
{
this.isMoving = true;
this.moveDirection = (this.targetPosition - this.transform.position).normalized * this.speed;
this.transform.rotation = Quaternion.LookRotation(new Vector3(this.moveDirection.x, 0f, this.moveDirection.z));
this.animation.CrossFade(this.runClip.name);
if(this.weaponSwipe != null) this.weaponSwipe.StartTrail(1f, 0f);
}
}
if (this.isMoving)
{
if(!this.IsArrivePosition())
{
this.characterController.Move(this.moveDirection * Time.deltaTime);
}
else
{
this.animation.CrossFade(this.idleClip.name);
if(this.weaponSwipe != null) this.weaponSwipe.ClearTrail();
this.transform.position = this.targetPosition;
this.isMoving = false;
}
}
}
/// <summary>
/// 验证是否到达目标地点
/// </summary>
/// <returns><c>true</c> if this instance is arrive position; otherwise, <c>false</c>.</returns>
private bool IsArrivePosition()
{
Vector3 currentDirection = (this.targetPosition - this.transform.position).normalized;
if (this.CalculateNormalized (currentDirection) == this.CalculateNormalized (this.moveDirection) * -1)
{
return true;
}
return false;
}
/// <summary>
/// 规范化比较向量
/// </summary>
/// <returns>The normalized.</returns>
/// <param name="direction">Direction.</param>
private Vector3 CalculateNormalized(Vector3 direction)
{
Vector3 value = Vector3.zero;
value.x = direction.x > 0 ? 1 : -1;
value.z = direction.z > 0 ? 1 : -1;
return value;
}
/// <summary>
/// 获取世界位置
/// </summary>
/// <returns>The world position.</returns>
private Vector3 GetWorldPosition()
{
Ray ray = this.mainCamera.ScreenPointToRay(Input.mousePosition);
RaycastHit raycastHit;
if(Physics.Raycast(ray, out raycastHit))
{
if(raycastHit.collider.gameObject.name == "Terrain")
{
return raycastHit.point;
}
}
return Vector3.zero;
}
}
最后给角色对象挂载 TrailsAnimationController.cs 组件以及 TrailsBladeMaster.cs 组件，同时还需要添加一个角色控制器（CharacterController），因为我们用这个来驱动角色移动，如图：
最后运行可以查看效果，点击地形，角色向目标点移动，并带有拖尾效果。
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