Unity实现攻击范围检测并绘制检测区域

本文实例为大家分享了Unity实现攻击范围检测并绘制检测区域的具体代码，供大家参考，具体内容如下

一、圆形检测

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// 圆形检测，并绘制出运行的攻击范围
/// </summary>
public class CircleDetect : MonoBehaviour {

GameObject go;  //生成矩形的对象
 public Transform attack;    //被攻击方

MeshFilter mf;
 MeshRenderer mr;
 Shader shader;

void Start () {

}

void Update () {
   if (Input.GetKeyDown(KeyCode.A))
   {
     ToDrawCircleSolid(transform, transform.localPosition, 3);
     if (CircleAttack(attack,transform,3))
     {
       Debug.Log("攻击到了");
     }
   }

if (Input.GetKeyUp(KeyCode.A))
   {
     if (go != null)
     {
       Destroy(go);
     }
   }
}

/// <summary>
 /// 圆形检测
 /// </summary>
 /// <param name="attacked">被攻击者</param>
 /// <param name="skillPostion">技能的位置</param>
 /// <param name="radius">半径</param>
 /// <returns></returns>
 public bool CircleAttack(Transform attacked, Transform skillPostion, float radius)
 {
   float distance = Vector3.Distance(attacked.position, skillPostion.position);
   if (distance <= radius)
   {
     return true;
   }
   else
   {
     return false;
   }
 }

//生成网格
 public GameObject CreateMesh(List<Vector3> vertices)
 {
   int[] triangles;
   Mesh mesh = new Mesh();
   int triangleAmount = vertices.Count - 2;
   triangles = new int[3 * triangleAmount];

//根据三角形的个数，来计算绘制三角形的顶点顺序
   //顺序必须为顺时针或者逆时针
   for (int i = 0; i < triangleAmount; i++)
   {
     triangles[3 * i] = 0;
     triangles[3 * i + 1] = i + 1;
     triangles[3 * i + 2] = i + 2;
   }

if (go == null)
   {
     go = new GameObject("circle");
     go.transform.SetParent(transform, false);
     go.transform.position = new Vector3(0, -0.4f, 0);

mf = go.AddComponent<MeshFilter>();
     mr = go.AddComponent<MeshRenderer>();
     shader = Shader.Find("Unlit/Color");
   }
   //分配一个新的顶点位置数组
   mesh.vertices = vertices.ToArray();
   //包含网格中所有三角形的数组
   mesh.triangles = triangles;
   mf.mesh = mesh;
   mr.material.shader = shader;
   mr.material.color = Color.red;
   return go;

}

/// <summary>
 /// 绘制实心圆形
 /// </summary>
 /// <param name="t">圆形参考物</param>
 /// <param name="center">圆心</param>
 /// <param name="radius">半径</param>
 public void ToDrawCircleSolid(Transform t, Vector3 center, float radius)
 {
   int pointAmount = 100;
   float eachAngle = 360f / pointAmount;
   Vector3 forward = t.forward;

List<Vector3> vertices = new List<Vector3>();
   for (int i = 0; i < pointAmount; i++)
   {
     Vector3 pos = Quaternion.Euler(0f, eachAngle * i, 0f) * forward * radius + center;
     vertices.Add(pos);
   }
   CreateMesh(vertices);
 }

}

效果图：

二、矩形检测

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// 矩形型攻击检测，并绘制检测区域
/// </summary>
public class DrawRectangDetect : MonoBehaviour {

public Transform attacked;
 GameObject go;   //生成矩形
 MeshFilter mf;
 MeshRenderer mr;
 Shader shader;

void Start () {

}

void Update () {
   if (Input.GetKeyDown(KeyCode.A))
   {
     ToDrawRectangleSolid(transform, transform.localPosition, 4, 2);

if (RectAttackJubge(transform, attacked, 4, 2f))
     {
       Debug.Log("攻击到");
     }
   }

if (Input.GetKeyUp(KeyCode.A))
   {
     if (go != null)
     {
       Destroy(go);
     }
   }
}

/// <summary>
 /// 矩形攻击范围
 /// </summary>
 /// <param name="attacker">攻击方</param>
 /// <param name="attacked">被攻击方</param>
 /// <param name="forwardDistance">矩形前方的距离</param>
 /// <param name="rightDistance">矩形宽度/2</param>
 /// <returns></returns>
 public bool RectAttackJubge(Transform attacker, Transform attacked, float forwardDistance, float rightDistance)
 {
   Vector3 deltaA = attacked.position - attacker.position;

float forwardDotA = Vector3.Dot(attacker.forward, deltaA);
   if (forwardDotA > 0 && forwardDotA <= forwardDistance)
   {
     if (Mathf.Abs(Vector3.Dot(attacker.right,deltaA)) < rightDistance)
     {
       return true;
     }
   }
   return false;
 }

//制作网格
 private GameObject CreateMesh(List<Vector3> vertices)
 {
   int[] triangles;
   Mesh mesh = new Mesh();

int triangleAmount = vertices.Count - 2;
   triangles = new int[3 * triangleAmount];

for (int i = 0; i < triangleAmount; i++)
   {
     triangles[3 * 1] = 0;
     triangles[3 * i + 1] = i + 1;
     triangles[3 * i + 2] = i + 2;
   }

if (go == null)
   {
     go = new GameObject("Rectang");
     go.transform.position = new Vector3(0, 0.1f, 0);
     mf = go.AddComponent<MeshFilter>();
     mr = go.AddComponent<MeshRenderer>();

shader = Shader.Find("Unlit/Color");
   }

mesh.vertices = vertices.ToArray();
   mesh.triangles = triangles;
   mf.mesh = mesh;
   mr.material.shader = shader;
   mr.material.color = Color.red;

return go;
 }

/// <summary>
 /// 绘制实心长方形
 /// </summary>
 /// <param name="t">矩形参考物</param>
 /// <param name="bottomMiddle">矩形的中心点</param>
 /// <param name="length">矩形长度</param>
 /// <param name="width">矩形宽度的一半</param>
 public void ToDrawRectangleSolid(Transform t, Vector3 bottomMiddle, float length, float width)
 {
   List<Vector3> vertices = new List<Vector3>();

vertices.Add(bottomMiddle - t.right * width);
   vertices.Add(bottomMiddle - t.right * width + t.forward * length);
   vertices.Add(bottomMiddle + t.right * width + t.forward * length);
   vertices.Add(bottomMiddle + t.right * width );

CreateMesh(vertices);
 }
}

效果图：

三、扇形攻击检测

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// 扇型攻击检测，并绘制检测区域
/// </summary>
public class SectorDetect : MonoBehaviour {

public Transform attacked; //受攻击着
 GameObject go;
 MeshFilter mf;
 MeshRenderer mr;
 Shader shader;

void Start () {

}

void Update () {

if (Input.GetKeyDown(KeyCode.A))
   {
     ToDrawSectorSolid(transform, transform.localPosition, 60, 3);
     if (UmbrellaAttact(transform,attacked.transform,60,4))
     {
       Debug.Log("受攻击了");
     }
   }

if (Input.GetKeyUp(KeyCode.A))
   {
     if (go != null)
     {
       Destroy(go);
     }
   }
}

/// <summary>
 /// 扇形攻击范围
 /// </summary>
 /// <param name="attacker">攻击者</param>
 /// <param name="attacked">被攻击方</param>
 /// <param name="angle">扇形角度</param>
 /// <param name="radius">扇形半径</param>
 /// <returns></returns>
 public bool UmbrellaAttact(Transform attacker, Transform attacked, float angle, float radius)
 {
   Vector3 deltaA = attacked.position - attacker.position;

//Mathf.Rad2Deg : 弧度值到度转换常度
   //Mathf.Acos(f) : 返回参数f的反余弦值
   float tmpAngle = Mathf.Acos(Vector3.Dot(deltaA.normalized, attacker.forward)) * Mathf.Rad2Deg;
   if (tmpAngle < angle * 0.5f && deltaA.magnitude < radius)
   {
     return true;
   }
   return false;
 }

public void ToDrawSectorSolid(Transform t, Vector3 center, float angle, float radius)
 {
   int pointAmmount = 100;
   float eachAngle = angle / pointAmmount;

Vector3 forward = t.forward;
   List<Vector3> vertices = new List<Vector3>();

vertices.Add(center);
   for (int i = 0; i < pointAmmount; i++)
   {
     Vector3 pos = Quaternion.Euler(0f, -angle / 2 + eachAngle * (i - 1), 0f) * forward * radius + center;
     vertices.Add(pos);
   }
   CreateMesh(vertices);
 }

private GameObject CreateMesh(List<Vector3> vertices)
 {
   int[] triangles;
   Mesh mesh = new Mesh();

int triangleAmount = vertices.Count - 2;
   triangles = new int[3 * triangleAmount];

//根据三角形的个数，来计算绘制三角形的顶点顺序
   for (int i = 0; i < triangleAmount; i++)
   {
     triangles[3 * i] = 0;
     triangles[3 * i + 1] = i + 1;
     triangles[3 * i + 2] = i + 2;
   }

if (go == null)
   {
     go = new GameObject("mesh");
     go.transform.position = new Vector3(0f, 0.1f, 0.5f);

mf = go.AddComponent<MeshFilter>();
     mr = go.AddComponent<MeshRenderer>();

shader = Shader.Find("Unlit/Color");
   }

mesh.vertices = vertices.ToArray();
   mesh.triangles = triangles;

mf.mesh = mesh;
   mr.material.shader = shader;
   mr.material.color = Color.red;

return go;
 }
}

效果图：

来源：https://blog.csdn.net/qq_38721111/article/details/86742317