7-3 Enemy Sight 敌人的视野

夜行的猫仔 · 发表于 2013-10-17 13:10:08

C#

using UnityEngine;
using System.Collections;
public class EnemySight : MonoBehaviour
{
public float fieldOfViewAngle = 110f; // 机器巡逻兵视野的角度.
public bool playerInSight; // 玩家是不是处于机器巡逻兵的视野中.
public Vector3 personalLastSighting; // 机器巡逻兵最后一个看到玩家的地点.
private NavMeshAgent nav; // Reference to the NavMeshAgent component.
private SphereCollider col; // Reference to the sphere collider trigger component.
private Animator anim; // Reference to the Animator.
private LastPlayerSighting lastPlayerSighting; // Reference to last global sighting of the player.
private GameObject player; // Reference to the player.
private Animator playerAnim; // Reference to the player's animator component.
private PlayerHealth playerHealth; // Reference to the player's health script.
private HashIDs hash; // Reference to the HashIDs.
private Vector3 previousSighting; // 玩家在视野中的最后一个位置.
void Awake ()
{
// 初始化成员.
nav = GetComponent<NavMeshAgent>();
col = GetComponent<SphereCollider>();
anim = GetComponent<Animator>();
lastPlayerSighting = GameObject.FindGameObjectWithTag(Tags.gameController).GetComponent<LastPlayerSighting>();
player = GameObject.FindGameObjectWithTag(Tags.player);
playerAnim = player.GetComponent<Animator>();
playerHealth = player.GetComponent<PlayerHealth>();
hash = GameObject.FindGameObjectWithTag(Tags.gameController).GetComponent<HashIDs>();
// 设置玩家的发现位置的初始值为resetPosition(1000,1000,1000).
personalLastSighting = lastPlayerSighting.resetPosition;
previousSighting = lastPlayerSighting.resetPosition;
}
void Update ()
{
// 如果玩家处于警报状态...
if(lastPlayerSighting.position != previousSighting)
// ... 设置玩家最后的发现位置为玩家的当前坐标.
personalLastSighting = lastPlayerSighting.position;
// 设置视野内玩家位置为当前玩家坐标.
previousSighting = lastPlayerSighting.position;
// 如果玩家是活的...
if(playerHealth.health > 0f)
// ... 设置玩家动画控制器中的playerInSightBool变量为playerInSight.
anim.SetBool(hash.playerInSightBool, playerInSight);
else
// ... 如果玩家已经死了，就设置playerInSightBool为false.
anim.SetBool(hash.playerInSightBool, false);
}
void OnTriggerStay (Collider other)
{
// 如果进入触发区域的是玩家...
if(other.gameObject == player)
{
// 设置默认的playerInSight状态为不可见.
playerInSight = false;
// 创建一个变量记录从机器人到玩家的方向向量.
Vector3 direction = other.transform.position - transform.position;
// 求得机器人正方向和玩家之间的角度
float angle = Vector3.Angle(direction, transform.forward);
// 如果玩家处于视野内...
if(angle < fieldOfViewAngle * 0.5f)
{
RaycastHit hit;
// ... 从机器人的身高部位向玩家发射一条射线...
if(Physics.Raycast(transform.position + transform.up, direction.normalized, out hit, col.radius))
{
// ... 射线触碰到了玩家...
if(hit.collider.gameObject == player)
{
// ... 玩家在视野内，被发现了，设置标志位为true.
playerInSight = true;
// 将警报标志位的坐标设定为玩家当前坐标.
lastPlayerSighting.position = player.transform.position;
}
}
}
// 获取动画层0和动画层1两层当前的动画播放状态机.
int playerLayerZeroStateHash = playerAnim.GetCurrentAnimatorStateInfo(0).nameHash;
int playerLayerOneStateHash = playerAnim.GetCurrentAnimatorStateInfo(1).nameHash;
// 如果玩家现在正处于行走或者呼唤状态(有声音)...
if(playerLayerZeroStateHash == hash.locomotionState || playerLayerOneStateHash == hash.shoutState)
{
// ... 并且玩家处于机器人的监听范围内...
if(CalculatePathLength(player.transform.position) <= col.radius)
// ... 设置玩家当前位置为发现角色的位置.
personalLastSighting = player.transform.position;
}
}
}
void OnTriggerExit (Collider other)
{
// 如果玩家离开了机器巡逻的监测区域...
if(other.gameObject == player)
// ... 视野失去目标.
playerInSight = false;
}
//--------------------------------------------------------------------
// 计算一条路径，返回需要走的步数
//--------------------------------------------------------------------
float CalculatePathLength (Vector3 targetPosition)
{
// 生成一个变量记录自动寻路的路径.
NavMeshPath path = new NavMeshPath();
if(nav.enabled)
nav.CalculatePath(targetPosition, path);
// 创建一个保存自动寻路节点的数组.数组的大小比实际的寻路节点多2个
Vector3 [] allWayPoints = new Vector3[path.corners.Length + 2];
// 第一个节点存的是机器人当前坐标.
allWayPoints[0] = transform.position;
// 最后一个存的是玩家的坐标.
allWayPoints[allWayPoints.Length - 1] = targetPosition;
// 中间的存的是自动寻路的路径节点.
for(int i = 0; i < path.corners.Length; i++)
{
allWayPoints[i + 1] = path.corners[i];
}
// 步长变量.
float pathLength = 0;
// 计算每一个节点之间的长度，并将这些长度加起来.
for(int i = 0; i < allWayPoints.Length - 1; i++)
{
pathLength += Vector3.Distance(allWayPoints[i], allWayPoints[i + 1]);
}
return pathLength;
}
}

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js脚本

#pragma strict
public var fieldOfViewAngle : float = 110f; // Number of degrees, centred on forward, for the enemy see.
public var playerInSight : boolean; // Whether or not the player is currently sighted.
public var personalLastSighting : Vector3; // Last place this enemy spotted the player.
private var nav : NavMeshAgent; // Reference to the NavMeshAgent component.
private var col : SphereCollider; // Reference to the sphere collider trigger component.
private var anim : Animator; // Reference to the Animator.
private var lastPlayerSighting : LastPlayerSighting; // Reference to last global sighting of the player.
private var player : GameObject; // Reference to the player.
private var playerAnim : Animator; // Reference to the player's animator component.
private var playerHealth : PlayerHealth; // Reference to the player's health script.
private var hash : HashIDs; // Reference to the HashIDs.
private var previousSighting : Vector3; // Where the player was sighted last frame.
function Awake ()
{
// Setting up the references.
nav = GetComponent(NavMeshAgent);
col = GetComponent(SphereCollider);
anim = GetComponent(Animator);
lastPlayerSighting = GameObject.FindGameObjectWithTag(Tags.gameController).GetComponent(LastPlayerSighting);
player = GameObject.FindGameObjectWithTag(Tags.player);
playerAnim = player.GetComponent(Animator);
playerHealth = player.GetComponent(PlayerHealth);
hash = GameObject.FindGameObjectWithTag(Tags.gameController).GetComponent(HashIDs);
// Set the personal sighting and the previous sighting to the reset position.
personalLastSighting = lastPlayerSighting.resetPosition;
previousSighting = lastPlayerSighting.resetPosition;
}
function Update ()
{
// If the last global sighting of the player has changed...
if(lastPlayerSighting.position != previousSighting)
// ... then update the personal sighting to be the same as the global sighting.
personalLastSighting = lastPlayerSighting.position;
// Set the previous sighting to the be the sighting from this frame.
previousSighting = lastPlayerSighting.position;
// If the player is alive...
if(playerHealth.health > 0f)
// ... set the animator parameter to whether the player is in sight or not.
anim.SetBool(hash.playerInSightBool, playerInSight);
else
// ... set the animator parameter to false.
anim.SetBool(hash.playerInSightBool, false);
}
function OnTriggerStay (other : Collider)
{
// If the player has entered the trigger sphere...
if(other.gameObject == player)
{
// By default the player is not in sight.
playerInSight = false;
// Create a vector from the enemy to the player and store the angle between it and forward.
var direction : Vector3 = other.transform.position - transform.position;
var angle : float = Vector3.Angle(direction, transform.forward);
// If the angle between forward and where the player is, is less than half the angle of view...
if(angle < fieldOfViewAngle * 0.5f)
{
var hit : RaycastHit;
// ... and if a raycast towards the player hits something...
if(Physics.Raycast(transform.position + transform.up, direction.normalized, hit, col.radius))
{
// ... and if the raycast hits the player...
if(hit.collider.gameObject == player)
{
// ... the player is in sight.
playerInSight = true;
// Set the last global sighting is the players current position.
lastPlayerSighting.position = player.transform.position;
}
}
}
// Store the name hashes of the current states.
var playerLayerZeroStateHash : int = playerAnim.GetCurrentAnimatorStateInfo(0).nameHash;
var playerLayerOneStateHash : int = playerAnim.GetCurrentAnimatorStateInfo(1).nameHash;
// If the player is running or is attracting attention...
if(playerLayerZeroStateHash == hash.locomotionState || playerLayerOneStateHash == hash.shoutState)
{
// ... and if the player is within hearing range...
if(CalculatePathLength(player.transform.position) <= col.radius)
// ... set the last personal sighting of the player to the player's current position.
personalLastSighting = player.transform.position;
}
}
}
function OnTriggerExit (other : Collider)
{
// If the player leaves the trigger zone...
if(other.gameObject == player)
// ... the player is not in sight.
playerInSight = false;
}
function CalculatePathLength (targetPosition : Vector3)
{
// Create a path and set it based on a target position.
var path : NavMeshPath = new NavMeshPath();
if(nav.enabled)
nav.CalculatePath(targetPosition, path);
// Create an array of points which is the length of the number of corners in the path + 2.
var allWayPoints : Vector3[] = new Vector3[path.corners.Length + 2];
// The first point is the enemy's position.
allWayPoints[0] = transform.position;
// The last point is the target position.
allWayPoints[allWayPoints.Length - 1] = targetPosition;
// The points inbetween are the corners of the path.
for(var i = 0; i < path.corners.Length; i++)
{
allWayPoints[i + 1] = path.corners[i];
}
// Create a float to store the path length that is by default 0.
var pathLength : float = 0;
// Increment the path length by an amount equal to the distance between each waypoint and the next.
for(var j = 0; j < allWayPoints.Length - 1; j++)
{
pathLength += Vector3.Distance(allWayPoints[j], allWayPoints[j + 1]);
}
return pathLength;
}

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7-3 Enemy Sight 敌人的视野

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