Hello everyone, since I started back at college I have been working on my FMP.
Up to now its going well I have setup quite a lot. You can see what I have done already here: MJ - YouTube
I’ve gotten to the point where I need to have my AI avoid buildings, walls, high terrain.
I’ve been looking at using raycasts to do this but I have no idea where to start.
My current AI
//var for health and setting the amount
//static var health : float = 100.0;
//players transform
var player : Transform;
var playerGO : GameObject;
//default speed of the enemy
var speed = 5.0;
//how far the enemy will attack from
var chaseRange = 50.0;
//attacking range
var dieRange = 5.0;
//last time enemy attacked
var lastShotFired = 0;
//how often the enemy can attack
var attackTime = 2;
//setting up var for the enemies controller(Makes it walk)
private var controller : CharacterController;
var bulletTraceGeneratorScript : GameObject;
function Start()
{
playerGO = GameObject.FindWithTag("Player");
player = playerGO.transform;
bulletTraceGeneratorScript = GameObject.FindWithTag("BulletTrace");
//gets the controller
controller = GetComponent(CharacterController);
// yield MyWaitFunction (2.0); (OLD CODE)
}
function Update()
{
//if the players var is empty put nothing in there
if (player == null)
return;
//How far away from the player the enemy is
var range = Vector3.Distance(player.position, transform.position);
//If the enemy is withtin attacking range(attack)
if (range <= dieRange)
{
//if the time is 2(attacktime) past the lastshotfired then attack
if (Time.time > lastShotFired + attackTime) {
Debug.Log("Attacking");
animation.Play("attack");
animation["attack"].speed = 2;
animation["attack"].wrapMode = WrapMode.Loop;
lastShotFired = Time.time;
player.GetComponent("health").health -= 10;
}
// yield return new WaitForSeconds(attackTime);(OLDCODE)
}
//if it isnt in the attacking range
else if (range >= chaseRange)
{
//enenmy looks at the player
transform.LookAt(player);
//setting up the var so the enemy knows which way to go
var moveDirection : Vector3 = transform.TransformDirection(Vector3.forward);
//moving the enemy toward the player (time.deltaTime*speed - making sure it is moving correctly)
controller.Move(moveDirection * Time.deltaTime * speed);
//this checks to see if the enemy is hovering above the ground
//this is common in most AI as it only moves the enemy straight towards the player
//this however fires a raycast at the floor which then adjusts the enemies position to
//the hit point of the raycast
//setting up the raycast var
var hit : RaycastHit;
//if the raycast (from the enemy (-up) downwards) hits something below then it will
//put the value in the hit var
if (Physics.Raycast (this.transform.position, -Vector3.up, hit)) {
//this is the distance from the hit point and the enemy
distanceToGround = hit.transform.position;
//DEBUG STUFF
//print("Distance: "+distanceToGround);
//print("Hitting "+hit.transform);
//the commented line below draws a line in the editor so that I can check it is working
//Debug.DrawLine (this.transform.position, hit.point, Color.red, 1);
//this moved the enemies position from where it was(floating) to the floor
this.transform.position = hit.point;
}
animation["RunninInPlace"].speed = 1;
animation.Play("RunninInPlace");
animation["RunninInPlace"].wrapMode = WrapMode.Loop;
}
//if it isnt doing any of the above stand still and play the idle animation
else
{
//plays the idle animation
animation.Play("idle");
//loops the animation
animation["idle"].wrapMode = WrapMode.Loop;
}
}
If anyone has any idea how I could implement raycasts to make my AI avoid stuff please help. I’m really stuck with this.
I don’t want anyone to do this for me. Just give me a way of doing it.
Thanks for any help you can give 
Mike