Unity 2D角色控制器（横板滚轴）

unity自带的2D刚体在坡上会往下滑。而且也是会有可能穿墙，或碰撞到其他物体时鬼畜抖动。

设计思路

1、利用射线进行判断碰撞防止穿墙：

原理传送门

2、在地面时往地面发射两条射线，获得的两个点，两个点形成的线，这个线是角色的移动向量。

下面是一个自定义的一个横板2D角色控制器，包含有简单的移动和跳跃。

代码：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class CharacterController2D : MonoBehaviour
{/// <summary>/// 角色输入轴/// </summary>public Vector2 axis;/// <summary>/// 角色受到的重力/// </summary>public float gravity = 10;/// <summary>/// 角色的移动速度/// </summary>public float moveSpeed = 30;/// <summary>/// 角色跳跃力/// </summary>public float jumpForce;/// <summary>/// 中心点偏移/// </summary>public Vector3 offset;/// <summary>/// 最大速度向量/// </summary>public float maxSpeed = 100;/// <summary>/// 前长度：该值决定角色到前墙的碰撞距离/// </summary>public float forwardLength = 1;/// <summary>/// 底长度：该值决定角色到地面的距离/// </summary>public float bottonLnegth = 0.5f;/// <summary>/// 底下的先与旁边的线偏移距离/// </summary>public float bottonForwardOffset = 0.25f;/// <summary>/// 上一次跳跃的到现在时间/// </summary>public float JumpTime { get => jumpTime; }/// <summary>/// 返回X轴的绝对值/// </summary>public float AxisAbs { get => axisAbs; }/// <summary>/// 角色是否进行了X反转/// </summary>public bool ReversalX { get => reversalX; }/// <summary>/// 角色是否在地面/// </summary>public bool OnGround { get => onGround; }/// <summary>/// 角色的实际位移速度/// </summary>public Vector3 Velocity { get => velocity; }/// <summary>/// 获取射线起始点/// </summary>public Vector3 RaycastStartPosi { get { return transform.position + offset; } }/// <summary>/// 获取X的速度长度(Mathf.Abs(velocity.x) * Time.deltaTime;)/// </summary>public float SpeedLengthX { get { return Mathf.Abs(velocity.x) * Time.deltaTime; } }/// <summary>/// 获取Y的速度长度(Mathf.Abs(velocity.y) * Time.deltaTime;)/// </summary>public float SpeedLengthY { get { return Mathf.Abs(velocity.y) * Time.deltaTime; } }/// <summary>/// 是否打开前方检测/// </summary>public bool OpenForward { get => openForward; set => openForward = value; }/// <summary>/// 是否打开自由浮空/// </summary>public bool FreeFloating { get => freeFloating; set => freeFloating = value; }/// <summary>/// 获取角色前面/// </summary>public Vector3 Forward{get{Vector3 forward = transform.right;forward.x = ReversalX ? forward.x * -1 : forward.x;return forward;}}private bool reversalX;private float axisAbs;private bool onGround;private float jumpTime;private bool openForward = true;private bool freeFloating = true;private Vector3 velocity;private Transform downJumpPlatform;/// <summary>/// 绘制碰撞检测距离/// </summary>private void OnDrawGizmos(){//fDebug.DrawRay(RaycastStartPosi, Forward * forwardLength, Color.green);//bVector3 forward = RaycastStartPosi + Forward * bottonForwardOffset;Debug.DrawRay(RaycastStartPosi, Vector2.down * bottonLnegth, Color.green);Debug.DrawRay(forward, Vector2.down * bottonLnegth, Color.green);//tDebug.DrawRay(RaycastStartPosi, Vector2.up * bottonLnegth, Color.green);}void Update(){if (axis.x < 0){reversalX = true;}else if (axis.x > 0){reversalX = false;}jumpTime += Time.deltaTime;axisAbs = Mathf.Abs(axis.x);//刷新角色的速度VelocityUpdate();velocity = Vector3.ClampMagnitude(velocity, maxSpeed);transform.position += velocity * Time.deltaTime;}/// <summary>/// 跳跃/// </summary>public void Jump(){if (OnGround){onGround = false;jumpTime = 0;RaycastHit2D bottonHit = Physics2D.Raycast(RaycastStartPosi, Vector2.down, bottonLnegth + SpeedLengthY, LayerMask.GetMask("Ground"));if (bottonHit && bottonHit.transform.tag == "Plane" && axis.y < 0){downJumpPlatform = bottonHit.transform;}else{velocity.y = jumpForce;}}}private void VelocityUpdate(){RaycastHit2D bottonHit, forwardHit;GetBottonRaycastHit(out bottonHit, out forwardHit);if (jumpTime > 0.2 && bottonHit && forwardHit){//如果是在平台上,并且下跳平台不为空if (downJumpPlatform){if (downJumpPlatform != bottonHit.transform){downJumpPlatform = null;}}else{onGround = true;//速度方向Vector2 speedDirection = (forwardHit.point - bottonHit.point).normalized;//坡度检查if (Vector3.Dot(speedDirection, Vector2.up) < 0.6f){velocity = speedDirection * AxisAbs * moveSpeed;}velocity.y = 0;transform.position = new Vector3(transform.position.x,(bottonHit.point.y <= forwardHit.point.y ? bottonHit.point.y : forwardHit.point.y) + bottonLnegth - bottonLnegth*0.1f - offset.y,transform.position.z);}}//在空中时else{onGround = false;if (freeFloating){velocity.x = axis.x * moveSpeed;}velocity.y -= gravity * Time.deltaTime;}RaycastHit2D topHit = Physics2D.Raycast(RaycastStartPosi, Vector2.up, bottonLnegth + SpeedLengthY, LayerMask.GetMask("Ground"));//如果顶部撞到墙并没撞到、或撞到的不是平台if (!topHit || topHit.transform.tag != "Plane"){if (topHit){velocity.y = 0;}FudgeForward();}}private void FudgeForward(){if (openForward){//判断是否撞墙XRaycastHit2D rf = GetForwardHit();if (rf){velocity.x = 0;float x = reversalX ? forwardLength - 0.1f : -forwardLength + 0.1f;transform.position = new Vector3(rf.point.x + x - offset.x,transform.position.y,transform.position.z);}}}private void GetBottonRaycastHit(out RaycastHit2D bottonHit, out RaycastHit2D forwardHit){//前射线位置Vector3 forward = RaycastStartPosi + Forward * bottonForwardOffset;//发射射线bottonHit = Physics2D.Raycast(RaycastStartPosi, Vector2.down, bottonLnegth + SpeedLengthY, LayerMask.GetMask("Ground"));forwardHit = Physics2D.Raycast(forward, Vector2.down, bottonLnegth + SpeedLengthY, LayerMask.GetMask("Ground"));}public RaycastHit2D GetForwardHit(){RaycastHit2D rf = Physics2D.Raycast(RaycastStartPosi, Forward, forwardLength + SpeedLengthX, LayerMask.GetMask("Ground"));return rf;}
}

end

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Unity 2D角色控制器（横板滚轴）

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