【Unity】检测目标是否在视线范围内（附视线范围扇形画法）

检测目标是否在视线范围内（附视线范围扇形画法）

using UnityEngine;

public class Test_CanSeeTarget : MonoBehaviour

{

    public GameObject target;

    /// <summary>

    /// 视线范围-半径

    /// </summary>

    public float sightViewRadius = 5;

    /// <summary>

    /// 视线范围-欧拉角

    /// </summary>

    public float sightViewEuler = 120;

    /// <summary>

    /// 画扇形

    /// </summary>

    /// <param name="radius"></param>

    /// <param name="euler"></param>

    /// <param name="color"></param>

    private void DrawSemicircle(float radius, float euler, Color color)

    {

        int segments = 10;

        float deltaAngle = euler / segments;

        Vector3 forward = transform.forward;

        Vector3[] vertices = new Vector3[segments + 2];

        vertices[0] = transform.position;

        for (int i = 1; i < vertices.Length; i++)

        {

            Vector3 pos = Quaternion.Euler(0f, -euler / 2 + deltaAngle * (i - 1), 0f) * forward * radius + transform.position;

            vertices[i] = pos;

        }

        // 画圆弧

        for (int i = 1; i < vertices.Length - 1; i++)

        {

            UnityEngine.Debug.DrawLine(vertices[i], vertices[i + 1], color);

        }

        // 画两条边

        UnityEngine.Debug.DrawLine(vertices[0], vertices[vertices.Length - 1], color);

        UnityEngine.Debug.DrawLine(vertices[0], vertices[1], color);

    }

    private bool CanSeeTarget()

    {

        float distance = Vector3.Distance(transform.position, target.transform.position);

        Vector3 forward = transform.rotation * Vector3.forward;

        Vector3 dir = target.transform.position - transform.position;

        // 计算两个向量间的夹角，必须归一化normalized

        float angle = Mathf.Acos(Vector3.Dot(forward.normalized, dir.normalized)) * Mathf.Rad2Deg;

        if (distance < sightViewRadius)

        {

            if (angle <= sightViewEuler / 2)

            {

                UnityEngine.Debug.Log("CanSeeTarget: {true}");

                return true;

            }

        }

        UnityEngine.Debug.Log("CanSeeTarget: {false}");

        return false;

    }

    void Update()

    {

        DrawSemicircle(sightViewRadius, sightViewEuler, Color.yellow);

        CanSeeTarget();

    }

}

【Unity】检测目标是否在视线范围内（附视线范围扇形画法）的相关教程结束。