Chaser (NavMeshAgent)

Chaser.cs

/*
  Chaser.cs (like as EnemyMovement.cs)

  Hierarchy - Create - 3D Object - Cylinder (あるいは prefab import) - Enemy
  Hierarchy - Enemy - Inspector - Add Component - Navigation - Nav Mesh Agent
  Project - Create - C# Script - Chaser (Chaser.cs 内容はコピペ等)
  Chaser - Enemy の上にドラッグドロップ (Inspector 上では Nav Mesh Agent の後)
  Hierarchy - Create - 3D Object - Terrain (あるいは 地形データ import)
  Menu - Window - Navigation (Inspector の横に出来る)
  地形データ - Navigation - Bake - (位置等 パラメータ 調整) - Bake ボタン押す
  Enemy - Navigation - Bake - (位置等 パラメータ 調整) - Bake ボタン押す
  Menu - Window - Console (出てないときは出しておく)
  実行 正常なら追跡
    (上の手順が足りないと no valid NavMesh とか SetDestination とかでエラー)
    地形データで Bake してないとき
      場所: nav = GetComponent<UnityEngine.AI.NavMeshAgent>();
      内容: Failed to create agent because there is no valid NavMesh
      場所: nav.SetDestination(player.position);
      内容: "SetDestination" can only be called on an active agent
             that has been placed on a NavMesh.
    Enemy の Inspector で Add Component してないとき
      場所: UnityEngine.AI.NavMeshAgent.SetDestination ...
      内容: MissingComponentException:
             There is no 'NavMeshAgent' attached to the "Enemy" game object,
             but a script is trying to access it.
            You probably need to add a NavMeshAgent to the game object "Enemy".
            Or your script needs to check if the component is attached
             before using it.
  まだ判ってないこと
    階段を登ると追いかけて来ない？(Y方向？)
    壁の陰に入ると回り込まずに引っかかる？
    常に背後にまわる方法？
*/

using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using System.Collections.Generic;
using System; // Math

public class Chaser : MonoBehaviour {
  int cnt = 0;

  public float dT = 0.00001f;

  public Transform player, enemy;
  //PlayerHealth playerHealth;
  //EnemyHealth enemyHealth;
  UnityEngine.AI.NavMeshAgent nav;

  void Awake(){
    // player = GameObject.FindGameObjectWithTag("Unitychan").transform;
    player = GameObject.Find("Unitychan").transform;
    enemy = GameObject.Find("Enemy").transform;
    //playerHealth = player.GetComponent<PlayerHealth>();
    //enemyHealth = enemy.GetComponent<EnemyHealth>();
    nav = GetComponent<UnityEngine.AI.NavMeshAgent>();
  }

  void OnDestroy(){
    Debug.Log("Chaser: Destroy");
  }

  void Start(){
    Debug.Log("Chaser: Start");
  }

  void Update(){
    ++cnt;
    if(cnt % 60 == 0) Debug.Log("Chaser: " + cnt);
    Vector3 unitypos = player.position;
    Vector3 enemypos = enemy.position;
    Debug.Log("unitypos: " + unitypos.x + ", " + unitypos.z);
    Debug.Log("enemypos: " + enemypos.x + ", " + enemypos.z);

    //if(enemyHealth.currentHealth > 0 && playerHealth.currentHealth > 0){
      nav.SetDestination(player.position);
    //}else{
    //  nav.enabled = false;
    //}
  }
}