Unity3D检测目标身体是否在椎体视野范围内

功能说明：

根据怪物头和脚的位置，检测怪物整个身子（某部分也可以）是否在椎体视野范围内（不使用Collider碰撞）

思路:

符合一下2点之一的目标在椎体区域内

1. 目标头/脚的向量与自身方向夹角在椎体角度内 并且 目标头/脚距离在设定距离内

2.目标头与脚的线与平面相交

如果考虑墙的阻挡 可以附加射线检测

限制：

①视野平行，角色直立

②不考虑role的肥瘦

实验截图：

   

源码：

public class ConeSightTest : MonoBehaviour {
    public GameObject srcPos;
    public GameObject endPos;
    public GameObject buttonPos;
    public float Dic;
    public float angle;
    public Transform[] pHead;
    public Transform[] pFoot;

    private void Start()
    {
        angle = Vector3.Angle(srcPos.transform.forward, endPos.transform.position - srcPos.transform.position);
        Dic = Vector3.Distance(srcPos.transform.position, endPos.transform.position);
    }

    void Update ()
    {
        for(int i=0;i<pHead.Length;i++)
        {
            if (IsTargetBodyInSectorRange(srcPos.transform.position, srcPos.transform.forward,
                angle, Dic, pHead[i].position, pFoot[i].position))
            {
                Debug.DrawLine(pHead[i].position, pFoot[i].position,Color.red);
            }
            else
                Debug.DrawLine(pHead[i].position, pFoot[i].position, Color.green);
        }     
    }


    public static bool IsTargetInSectorRange(Vector3 srcPos, Vector3 srcDir, float srcAngle, float srcDist,
        Vector3 tarPos)
    {
        Vector3 toTarVec = tarPos - srcPos;
        float deltaAngle = Vector3.Angle(srcDir, toTarVec);
        if (deltaAngle < srcAngle)
        {
            float dist = Vector3.Distance(srcPos, tarPos);
            if (dist < srcDist)
            {
                return true;
            }
        }
        return false;
    }

    public static bool IsTargetBodyInSectorRange(Vector3 srcPos, Vector3 srcDir, float srcAngle, float srcDist,
        Vector3 tarHeadPos, Vector3 tarFootPos)
    {
        if (IsTargetInSectorRange(srcPos, srcDir, srcAngle, srcDist, tarHeadPos))
            return true;
        if (IsTargetInSectorRange(srcPos, srcDir, srcAngle, srcDist, tarFootPos))
            return true;
        if (tarFootPos.y <= srcPos.y && srcPos.y <= tarHeadPos.y &&
           IsTargetInSectorRange(srcPos, srcDir, srcAngle, srcDist, new Vector3(tarFootPos.x, srcPos.y, tarFootPos.z)))
            return true;
        return false;
    }
}