Unity制作RPG游戏的角色二段跳功能（不跳出地形外）

前言

制作RPG游戏的时候，一般我们会用寻路系统Navigation，假如要制作一个跳跃功能，需要注意跳跃的时候不能跳到地形外面，并且起跳的时候，要把NavMeshAgent关闭，落地的时候再重新激活，下面就用一个简单的例子教大家。

1 烘焙地形

选择地形，设置为Navigation Static

点击菜单Windwo/Navigation，在Navigation窗口的Bake标签页中点击Bake按钮，开始烘焙

2 角色控制

本例中用的是一个Cube代替角色，给Cube挂上NavMeshAgent组件

编写Player.cs脚本，按方向键控制Cube移动，按空白键控制Cube跳跃
代码如下

// Player.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;public class Player : MonoBehaviour
{public NavMeshAgent navAgent;JumpLogic m_jumpLogic = new JumpLogic();// Use this for initializationvoid Start () {m_jumpLogic.Init(navAgent, transform);}// Update is called once per framevoid Update (){m_jumpLogic.UpdateJump();if (Input.GetKeyDown(KeyCode.Space)){m_jumpLogic.Jump();}if (Input.GetKey(KeyCode.UpArrow)){transform.position += new Vector3(0, 0, Time.deltaTime);}if (Input.GetKey(KeyCode.DownArrow)){transform.position += new Vector3(0, 0, -Time.deltaTime);}if (Input.GetKey(KeyCode.LeftArrow)){transform.position += new Vector3(-Time.deltaTime, 0, 0);}if (Input.GetKey(KeyCode.RightArrow)){transform.position += new Vector3(Time.deltaTime, 0, 0);}}
}

3 跳跃逻辑

编写跳跃逻辑脚本JumpLogic.cs，实现二段跳功能，并确保不会跳到地形外面，代码如下

// JumpLogic.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;public class JumpLogic
{public enum JUMPTYPE{JUMP01 = 1,JUMP02 = 2}private NavMeshAgent m_navAgent;private Transform m_modelTrans;private bool m_isJump;/// <summary>/// 是否处在跳跃中/// </summary>public bool IsJump { get { return m_isJump; } }private bool mIsJump2;/// <summary>/// 是否处在二段跳中/// </summary>public bool IsJump2 { get { return mIsJump2; } }private bool m_isJumpReady;private bool m_isJumpOver;private Vector3 m_targetPos;public float ShotSpeed = 6;public float Duration;          //代表从起始点出发到目标点经过的时长public float Gravity = -15;     //重力加速度private Vector3 mStartSpeed;        //初速度向量private float mUseTimeJump;private float mUseTimeJumpOver;private bool mIsSourceJump;     //是否是原地起跳private Vector3 mSourcePos;     //起跳之前的位置private float mfDisYOld;        //上一次的当前与目标高度差private int m_curStep;      //记录当前几段跳Vector3 m_targetDirection;//移动的目标点private Vector3 m_vecTargetPos;public Vector3 VecTargetPos{get { return m_vecTargetPos; }set{m_vecTargetPos = value;}}private Vector3 Position{get { return m_modelTrans.position; }set { m_modelTrans.position = value; }}public void Init(NavMeshAgent navAgent, Transform modelTrans){m_navAgent = navAgent;m_modelTrans = modelTrans;}public void Jump(){int nStep = 1;//默认想服务器申请使用一段跳，如果正在轻功状态并且二段跳已经可以使用并且未激活，则申请发起二段跳if (IsJump && !IsJump2){nStep = 2;}//如果没有使用摇杆则用人物当前的朝向m_targetDirection = m_modelTrans.forward;bool bhit = false;NavMeshHit hit;Vector3 jumpPos = Vector3.zero;if (nStep == (int)JUMPTYPE.JUMP02){//二段跳jumpPos = Position + m_targetDirection * 10f;bhit = NavMesh.SamplePosition(jumpPos, out hit, 5, -1);if (!bhit){jumpPos = Position + m_targetDirection * 10f;bhit = NavMesh.SamplePosition(jumpPos, out hit, 12, -1);}//先计算如果两个点离的很近就走原地跳跃if (bhit){float dis = Vector3.Distance(hit.position, Position);if (dis < 4){bhit = false;mSourcePos = hit.position;}}else{//二段跳如果没有找到可跳跃点，则将原始点设置为一段跳的起始点，防止二段跳的时候又跳回去了mSourcePos = m_targetPos;}}else{//一段跳//先计算跳跃点mSourcePos = Position;jumpPos = Position + m_targetDirection * 6f;bhit = NavMesh.SamplePosition(jumpPos, out hit, 3, 1);if (!bhit){jumpPos = Position + m_targetDirection * 6f;bhit = NavMesh.SamplePosition(jumpPos, out hit, 5, 1);}//先计算如果两个点离的很近就走原地跳跃if (bhit){float dis = Vector3.Distance(hit.position, Position);//Debugger.Log("跳跃目标距离：{0}", dis);if (dis < 4){bhit = false;mSourcePos = hit.position;}}}//跳跃朝向Vector3 dir = Vector3.zero;var isYuanDi = true;if (!bhit){//原地跳跃的处理jumpPos = mSourcePos;dir = m_targetDirection;//原地起跳直接用摇杆方向isYuanDi = true;}else{//可正常跳跃jumpPos = hit.position;isYuanDi = false;}JumpToOther(jumpPos, nStep, isYuanDi);}public void JumpToOther(Vector3 dstPos, int nStep, bool isYuanDi){if (mIsJump2 || m_isJumpOver){//已经处在二段跳或者跳跃结束了就不操作了return;}m_curStep = nStep;m_targetDirection = m_modelTrans.forward;if (nStep == (int)JUMPTYPE.JUMP02){//二段跳mIsJump2 = true;ShotSpeed = 9;}else{//一段跳ShotSpeed = 7;}Vector3 dir = Vector3.zero;if (isYuanDi){//原地跳dir = m_targetDirection;//原地起跳直接用摇杆方向mIsSourceJump = true;if (nStep == (int)JUMPTYPE.JUMP02){Duration = .8f;ShotSpeed = 7f;}else{Duration = .6f;ShotSpeed = 5f;}}else{//正常跳Duration = Vector3.Distance(Position, dstPos) / ShotSpeed;dir = (new Vector3(dstPos.x, Position.y, dstPos.z) - Position);//正常跳跃用目标点的朝向}m_isJumpReady = true;m_isJump = true;//IsLightState = true;m_isJumpOver = false;m_navAgent.enabled = false;m_targetPos = dstPos;//计算初速度mStartSpeed = new Vector3((m_targetPos.x - Position.x) / Duration,(m_targetPos.y - Position.y) / Duration - 0.5f * Gravity * Duration,(m_targetPos.z - Position.z) / Duration);mUseTimeJump = 0;//播放起跳动作if (mIsJump2){//TODO 播放二段跳动作}else{//TODO 播放起跳动作}//立即朝向dir.Normalize();FaceToDirection(dir);m_isJumpReady = false;}/// <summary>/// 面朝方向向量/// </summary>/// <param name="_dir"></param>public void FaceToDirection(Vector3 dir){if (dir == Vector3.zero){return;}m_modelTrans.rotation = Quaternion.LookRotation(dir);}public void UpdateJump(){if (m_isJump && !m_isJumpReady){if (!m_isJumpOver){//跳跃中处理Vector3 deltaSpeed = Vector3.zero;deltaSpeed.y = Gravity * (mUseTimeJump + Time.deltaTime);//v=atPosition += (mStartSpeed + deltaSpeed) * Time.deltaTime;float disY = Mathf.Abs(Position.y - m_targetPos.y);float remainTime = Duration - mUseTimeJump;//Debugger.Log("disY:{0}", disY);//是否已达到目标位置if ((remainTime <= .1f && (disY <= .2f || disY > mfDisYOld)) || (!mIsSourceJump && mUseTimeJump >= Duration)){//跳跃结束，更新目标点，否则在寻路过程中跳跃，结束时会播放跑步动作m_vecTargetPos = Position;m_isJumpOver = true;mUseTimeJumpOver = 0;mIsJump2 = false;m_navAgent.enabled = true;//TODO 播放跳跃结束动作//}else{mUseTimeJump += Time.deltaTime;mfDisYOld = disY;//记录上一次的高度，防止卡帧时的处理}}else{//跳跃结束延时处理，防止一下落就行走看不到结束动画mUseTimeJumpOver += Time.deltaTime;if (mUseTimeJumpOver >= 0.1f){//延时一下再结束m_isJump = false;m_isJumpOver = false;mIsSourceJump = false;}}}}
}

4 运行效果