SnowField目标效果2-6：斜面移动2更真实的斜坡

待实现：在较小的斜坡上可以站住不动，在大的斜坡上会一直下滑，下滑时无法正常跑动

办法1：在2-4的基础上，加入坡度判断，用法线向量来表示
声明变量hitNormal
我们在重力代码中控制重力变化的部分加入条件
//条件1：不走&&坡度60||条件2：跳
if (Input.GetAxisRaw("Horizontal") == 0 && hitNormal.y > 0.5f || Input.GetAxisRaw("Vertical") != 0)
{
gravity = 0;
}
条件中的0.5是60度坡的cos，也就是坡度小于60度

实现下滑跑动禁止
首先在update中加条件
if (hitNormal.y < 0.5f)
{
velocity = new Vector2(0f, 0f);
}
再修改一下重力代码，使下滑时的重力大些
if (isTouched == false)
{
gravity += 5f;
}
else
{
gravity = 60;
getTop = false;
if (velocity.x == 0 && hitNormal.y > 0.5f || velocity.y != 0)//条件1：不走&&坡度60||条件2：跳
{
gravity = 0;
}
if (velocity.x != 0 && tangentDirection.y > 0)
{
gravity = 20;
}
if(hitNormal.y < 0.5f)
{
gravity = 100;
}
}

又发现一个问题：由于斜面坡度判断，同一片地上两个方向行走时重力不同，导致鼠标冲跳时的初速度不同
在鼠标冲跳代码中加入gravity = 0;
void MouseController()
{

if (!Input.GetMouseButton(0))
{
mouseLocation = Input.mousePosition;
}
if (Input.GetMouseButton(0) && (mouseLocation - Input.mousePosition).magnitude >= 20)
{
if (isTouched == true)
{
jumpDirect = (Input.mousePosition - mouseLocation).normalized;
if (jumpDirect.y > 0 && inAir == 0)
{
gravity = 0;
//jumpShortOrLong = 2;
velocityMouse = 0.3f;
inAir = 1;
isTouched = false;
}
}

}
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;[RequireComponent(typeof(Collider2D))]
public class SnowField02 : MonoBehaviour
{private const float MIN_MOVE_DISTANCE = 0.001f;private new Collider2D collider2D;private new Rigidbody2D rigidbody2D;private ContactFilter2D contactFilter2D;private readonly List<RaycastHit2D> raycastHit2DList = new List<RaycastHit2D>();private readonly List<RaycastHit2D> tangentRaycastHit2DList = new List<RaycastHit2D>();public LayerMask layerMask;//[HideInInspector]public Vector2 velocity = Vector2.zero;public float velocityMouse = 0f;public Vector2 tangentDirection = Vector2.zero;public Vector2 hitNormal = Vector2.zero;//BaseControllerMouseMovepublic Vector3 mouseLocation = Vector3.zero;public Vector2 jumpDirect = Vector2.zero;public int inAir = 0;public float gravity = 60;public bool isTouched = false;public bool getTop = false;private Vector3 theScale = new Vector3(0.5f, 0.5f, 1);void Start(){collider2D = GetComponent<Collider2D>();rigidbody2D = GetComponent<Rigidbody2D>();if (rigidbody2D == null)rigidbody2D = gameObject.AddComponent<Rigidbody2D>();rigidbody2D.hideFlags = HideFlags.NotEditable;//rigidbody2D.bodyType = RigidbodyType2D.Kinematic;rigidbody2D.simulated = true;rigidbody2D.useFullKinematicContacts = false;rigidbody2D.collisionDetectionMode = CollisionDetectionMode2D.Continuous;rigidbody2D.sleepMode = RigidbodySleepMode2D.NeverSleep;rigidbody2D.interpolation = RigidbodyInterpolation2D.Interpolate;rigidbody2D.constraints = RigidbodyConstraints2D.FreezeRotation;rigidbody2D.gravityScale = 0;contactFilter2D = new ContactFilter2D{useLayerMask = true,useTriggers = false,layerMask = layerMask};}private void OnValidate(){contactFilter2D.layerMask = layerMask;}private void Update(){if (isTouched == true){velocity = new Vector2(Input.GetAxisRaw("Horizontal"), Input.GetAxisRaw("Vertical"));}if (hitNormal.y < 0.5f){velocity = new Vector2(0f, 0f);}}private void FixedUpdate(){Movement(velocity * Time.deltaTime * 5f);MouseController();if (isTouched == false && inAir == 1){inAir = 2;}if (isTouched == true && inAir == 2){inAir = 0;velocityMouse = 0f;mouseLocation = Input.mousePosition;}rigidbody2D.position += jumpDirect * velocityMouse;}private void Movement(Vector2 deltaPos){Vector2 deltaPosition = deltaPos + new Vector2(0, gravity * gravity * Time.deltaTime * -0.001f) ;Vector2 updateDeltaPosition = Vector2.zero;float distance = deltaPosition.magnitude;Vector2 direction = deltaPosition.normalized;if (distance <= MIN_MOVE_DISTANCE)distance = MIN_MOVE_DISTANCE;if (rigidbody2D.Cast(direction, contactFilter2D, raycastHit2DList, distance) == 0){isTouched = false;}else{isTouched = true;}Vector2 finalDirection = direction;float finalDistance = distance;foreach (var hit in raycastHit2DList){float moveDistance = hit.distance;hitNormal = hit.normal;Debug.DrawLine(hit.point, hit.point + hitNormal, Color.white);Debug.DrawLine(hit.point, hit.point + direction, Color.yellow);//float projection = Vector2.Dot(hitNormal, direction);if (projection >= 0){moveDistance = distance;}else{tangentDirection = new Vector2(hitNormal.y, -hitNormal.x);float tangentDot = Vector2.Dot(tangentDirection, direction);if (tangentDot < 0){tangentDirection = -tangentDirection;tangentDot = -tangentDot;}float tangentDistance = tangentDot * distance;if (tangentDot != 0){rigidbody2D.Cast(tangentDirection, contactFilter2D, tangentRaycastHit2DList, tangentDistance);foreach (var tangentHit in tangentRaycastHit2DList){Debug.DrawLine(tangentHit.point, tangentHit.point + tangentDirection, Color.magenta);if (Vector2.Dot(tangentHit.normal, tangentDirection) >= 0)continue;if (tangentHit.distance < tangentDistance)tangentDistance = tangentHit.distance;}updateDeltaPosition += tangentDirection * tangentDistance;}}if (moveDistance < finalDistance){finalDistance = moveDistance;}}updateDeltaPosition += finalDirection * finalDistance;rigidbody2D.position += updateDeltaPosition;if (isTouched == false){gravity += 5f;}else{gravity = 60;getTop = false;if (velocity.x == 0 && hitNormal.y > 0.5f || velocity.y != 0){gravity = 0;}if (velocity.x != 0 && tangentDirection.y > 0){gravity = 20;}if(hitNormal.y < 0.5f){gravity = 100;}}if ((jumpDirect * velocityMouse + deltaPosition).y < 0 && getTop == false && isTouched == false){gravity = 60;jumpDirect.y = 0;velocity.y = 0;getTop = true;}}void MouseController(){if (!Input.GetMouseButton(0)){mouseLocation = Input.mousePosition;}if (Input.GetMouseButton(0) && (mouseLocation - Input.mousePosition).magnitude >= 20){if (isTouched == true){jumpDirect = (Input.mousePosition - mouseLocation).normalized;if (jumpDirect.y > 0 && inAir == 0){gravity = 0;//jumpShortOrLong = 2;velocityMouse = 0.3f;inAir = 1;isTouched = false;}}}}
}

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