koobas.hobune.stream
Make NPC follow player when seen?
Hi all, I am making a horror game with a random walking NPC. When the NPC sees the character, (when the player goes in range of the NPC's attached box collider), I want the NPC to start following the player for 10 seconds. The comments
for the code are at the bottom of my script, the rest is the random walking I coded.
public class Walking : MonoBehaviour {
private float latestDirectionChangeTime;
private readonly float directionChangeTime = 3f;
private float characterVelocity = 2f; //Random.Range(.5f, 3f);
private Vector3 movementDirection;
private Vector3 movementPerSecond;
public GameObject alien;
void Start(){
latestDirectionChangeTime = 0f;
calcuateNewMovementVector();
}
void calcuateNewMovementVector(){
//create a random direction vector with the magnitude of 1, later multiply it with the velocity of the enemy
movementDirection = new Vector3(Random.Range(-1.0f, 1.0f), 0,Random.Range(-1.0f, 1.0f)).normalized;
movementPerSecond = movementDirection * characterVelocity;
}
void Update(){
//if the changeTime was reached, calculate a new movement vector
if (Time.time - latestDirectionChangeTime > directionChangeTime)
{
latestDirectionChangeTime = Time.time;
calcuateNewMovementVector();
}
//move enemy:
transform.position = new Vector3(transform.position.x + (movementPerSecond.x * Time.deltaTime), 22.45f,
transform.position.z + (movementPerSecond.z * Time.deltaTime));
//wait a set amount of timeeeeeee
//if his movement is to the west, then he turns 90 in the y axis
alien.transform.rotation = Quaternion.Slerp (alien.transform.rotation,
Quaternion.LookRotation (movementDirection), Time.deltaTime * 4f);
// Update is called once per frame
void UntilSeen()
{
/*
* When the player is 'seen' (goes into the range of the box collider on the NPC)
* The NPC will follow the player at 2x speed
*
* If the player gets out of the NPC's box collider for 10 seconds,
* the NPC will slow down and go back to the Walking Script
*
* i know i need to use waituntil code
*/
}}}}
I attached an image of that the box collider will look like. I have walls in the game, and want to make sure that the collider cannot "see" through walls also. Thank you so much in advance!
using a box collider is probably the wrong approach. Try using a Raycast ins$$anonymous$$d (it's even more intuitive for things like crouching behind objects, seeing the player through peep holes, etc.) whereas a collider will always prove somewhat troublesome.
//pseudo-code
Update()
//get angle from Alien's forward direction to the player's position
Vector3 targetDir = player.position - transform.position;
float angle = Vector3.Angle(targetDir, transform.forward);
if (angle < 30f)
{
// limiting the field of view will imitate a "zone" in which he can see in front of him.
// set a distance for him to look, so he can't catch the player infinity miles away
if (Vector3.Distance(player.position, transform.position) < 15f)
{
TryFindPlayer();
}
}
TryFindPlayer()
{
Vector3 directionToPlayer = (player.position - transform.position).Normalize();
if (Physics.Raycast(transform.position, directionToPlayer, out hit, maximumViewDistance)
{
Debug.DrawRay(transform.position, transform.TransformDirection(Vector3.forward) * hit.distance, Color.yellow);
Debug.Log("Player has been spotted");
}
}
You could try to use navmesh agents and when you want it to stop moving just use NavMeshAgent.ResetPath()
Try this:
//Create a few more variables
private GameObject player;
private Transform target;
private float distance;
public float sight;
//Inside Start:
player = GameObject.FindGameObjectWithTag("Player")
target = player.GetComponent<Transform>();
//Inside Update:
distance = Vector3.Distance(target.position, alien.transform.position);
if (distance <= sight) {
alien.agent.SetDestination(target);
}
You should be able to figure everything else out. Make sure you set your ground to static and under navigation click the bake button. Also add a NavMeshAgent into the enemy.
Maybe you can set the collider to trigger then add a
void OnTriggerEnter(Collider other)
{
// Start Following Player by getting the player coordinate in Update()
}
