Vector3.Dot (내적)

Vector3.Dot, 내적, Fov, 시야각 

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

[CustomEditor(typeof(Fov))]
public class FovEditor : Editor
{
    private void OnSceneGUI()
    {
        Fov fov = (Fov)this.target;

        //주어진 각도의 1/2
        Vector3 fromAnglePos = fov.CirclePoint(-fov.angle * 0.5f);
        fov.anglePos = fromAnglePos;


        Handles.color = new Color(1, 1, 1, 0.3f);

        Handles.DrawWireDisc(fov.gameObject.transform.position, //원점 좌표 
                            Vector3.up, //노멀 벡터 
                            fov.area);  //원의 반지름 

        Handles.DrawSolidArc(fov.transform.position,    //원점 
                             Vector3.up,    //노멀 벡터 
                             fromAnglePos,  //시작위치 
                             fov.angle, //각도 
                             fov.area); //반지름 
        GUIStyle guiStyle = new GUIStyle();
        guiStyle.fontSize = 40;
        Handles.Label(fov.transform.position + fov.transform.forward, fov.angle.ToString(), guiStyle);

        //fov.area =
        //   Handles.ScaleValueHandle(fov.area,
        //                   fov.transform.position + fov.transform.forward * fov.area,
        //                   fov.transform.rotation,
        //                   1,
        //                   Handles.ConeHandleCap,
        //                   1);

    }
}

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

public class Fov : MonoBehaviour
{
    public float area = 1f;
    public float angle = 60f;

    public Vector3 anglePos;

    
    public Vector3 CirclePoint(float angle) {
        angle += this.transform.eulerAngles.y;
        return new Vector3(Mathf.Sin(angle * Mathf.Deg2Rad), 0, Mathf.Cos(angle * Mathf.Deg2Rad));
    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Linq;
public class FovMain : MonoBehaviour
{
    private List<Enemy> list;
    public GameObject hero;
    private Fov fov;
    void Start()
    {
        this.fov = this.hero.GetComponent<Fov>();
        this.list = FindObjectsOfType<Enemy>().ToList();
    }

    // Update is called once per frame
    void Update()
    {
        foreach (var enemy in this.list) {
            var toOther = enemy.transform.position - this.hero.transform.position;
            var angle = Vector3.Angle(this.hero.transform.forward, toOther);
            var distance = toOther.magnitude;

            if (distance <= this.fov.area && angle < this.fov.angle / 2) {
                Debug.DrawLine(this.hero.transform.position, enemy.gameObject.transform.position, Color.red);
            }
        }
    }
}