unity3d stealth 적의 시야 관련 스크립트

| 카테고리 없음 2015. 1. 4. 20:35

Posted by 히아레인

using UnityEngine;
using System.Collections;

public class EnemySight : MonoBehaviour 
{
	public float fieldOfViewAngle = 110f;           // Number of degrees, centred on forward, for the enemy see.
	public bool playerInSight;                      // Whether or not the player is currently sighted.
	public Vector3 personalLastSighting;            // Last place this enemy spotted the player.

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;               // Where the player was sighted last frame.
	
	
	void 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;
	}
	
	
	void 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);
	}
	
	
	void OnTriggerStay (Collider other)
	{
		// 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.
			Vector3 direction = other.transform.position - transform.position;
			float angle = 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)
			{
				RaycastHit hit;
				
				// ... and if a raycast towards the player hits something...
				if(Physics.Raycast(transform.position + transform.up, direction.normalized, out 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.
			int playerLayerZeroStateHash = playerAnim.GetCurrentAnimatorStateInfo(0).nameHash;
			int playerLayerOneStateHash = 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;
			}
		}
	}
	
	
	void OnTriggerExit (Collider other)
	{
		// If the player leaves the trigger zone...
		if(other.gameObject == player)
			// ... the player is not in sight.
			playerInSight = false;
	}
	
	
	float CalculatePathLength (Vector3 targetPosition)
	{
		// Create a path and set it based on a target position.
		NavMeshPath path = 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.
		Vector3[] allWayPoints = 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(int 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.
		float pathLength = 0;
		
		// Increment the path length by an amount equal to the distance between each waypoint and the next.
		for(int i = 0; i < allWayPoints.Length - 1; i++)
		{
			pathLength += Vector3.Distance(allWayPoints[i], allWayPoints[i + 1]);
		}
		
		return pathLength;
	}

}