Unity实现攻击范围检测并绘制检测区域

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);
  }
}								 
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