Develop Reference

Why the speed variable have no factor when changing in the inspector the value in run time ? How to update positions and make nonstop moving?

The main goal is to move the object between the positions with a delay. This is working fine but other things are not working.
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
public class Waypoints : MonoBehaviour
{
public GameObject objectPrefab;
public LineRenderer lineRenderer;
public List<Transform> pointsToMove;
public float speed;
public bool go = false;
private List<GameObject> objectsToMove;
private List<Vector3> positions;
void Start()
{
objectsToMove = new List<GameObject>();
//Spawn objects and start movement
}
private void Update()
{
if (go && lineRenderer.positionCount > 0 && CurvedLineRenderer.linesSet)
{
positions = GetLinePointsInWorldSpace();
foreach(Transform objToMove in pointsToMove)
{
positions.Add(objToMove.position);
}
for (int i = 0; i < 3; i++)
{
objectsToMove.Add(Instantiate(objectPrefab, transform.parent));
StartCoroutine(Move(i));
}
go = false;
}
}
private IEnumerator Move(int i)
{
//Wait interval
yield return new WaitForSeconds(i * 10);
bool stillTraveling = true;
int pointIndex = 0;
float threshold = 0.1f;
while (stillTraveling)
{
//Check if close to point
if (Vector3.Distance(objectsToMove[i].transform.position, positions[pointIndex]) < threshold)
{
//Check if can move next point
if (pointIndex + 1 > positions.Count - 1)
{
stillTraveling = false;
}
//If not stop moving
else
{
pointIndex++;
}
}
//Move towards point
objectsToMove[i].transform.position = Vector3.MoveTowards(objectsToMove[i].transform.position, positions[pointIndex], speed * Time.deltaTime);
yield return null;
}
}
List<Vector3> GetLinePointsInWorldSpace()
{
var pointsToMove = new Vector3[lineRenderer.positionCount];
//Get the positions which are shown in the inspector
lineRenderer.GetPositions(pointsToMove);
//the points returned are in world space
return pointsToMove.ToList();
}
}
I'm updating once the positions in the Update.
I'm using StartCoroutine once in the Update to send the objects to move between the waypoints with a delay.
private void Update()
{
if (go && lineRenderer.positionCount > 0 && CurvedLineRenderer.linesSet)
{
positions = GetLinePointsInWorldSpace();
foreach(Transform objToMove in pointsToMove)
{
positions.Add(objToMove.position);
}
for (int i = 0; i < 3; i++)
{
objectsToMove.Add(Instantiate(objectPrefab, transform.parent));
StartCoroutine(Move(i));
}
go = false;
}
}
It's working by sending the objects to move with delay between the waypoints, but now I have some other problems.
Because I'm using StartCoroutine for the delay and because I'm setting the go flag to false then the speed value have no affect on the moving objects at run time and I'm not sure how to solve it so the speed will have a factor affecting the moving objects.
Another problem or not a problem but not sure how to do it is how to Update in run time the positions List ? Here in the Update I'm updating the List once :
positions = GetLinePointsInWorldSpace();
foreach(Transform objToMove in pointsToMove)
{
positions.Add(objToMove.position);
}
but I want that if the amount of positions in the function GetLinePointsInWorldSpace or/and the amount of pointsToMove have changed to update the positions List at rune time. I could just call this part in the update nonstop but I'm not sure of it will be too expensive ?
Last problem or how to do is how to make the object to move to move between the waypoints non stop over again from the start or moving backward when getting the last waypoint ? Again because using StartCoroutine for the delay everything is happening once.

If you want to move an object from one point to another, you should use Mathf.Sin(). The is using the sine function, and you put in the amount of cycles times Mathf.PI times 2. Here is what you would write:
float period = 2f;
Vector3 a; //the first point the object goes to
Vector3 b; //the second point that the object goes to
void Update()
{
float cycles = period * Time.time * Mathf.PI;
float amplitude = Mathf.Sin(cycles);
Vector3 location = Vector3.Lerp(a, b, amplitude);
Transform.position = location;
}
I then use Vector3.Lerp to interpolate between point a and point b. This isn’t what you were doing, but it is a much simpler way you can do it.
Vector3 a; //the first point the object goes to
Vector3 b; //the second point that the object goes to
void Update()
{
float cycles = period * Time.time;
Vector3 location = Vector3.Lerp(a, b, cycles);
Transform.position = location;
}
This one is for bringing the object just strait to point b and not back.
If you want there to be a delay between when it moves, here is the script:
float period = 2f;
float waitTime;
bool AtoB = true;
Vector3 a; //the first point the object goes to
Vector3 b; //the second point that the object goes to
void Start()
{
StartCoroutine(“Oscillator”);
}
IEnumerator Oscillator
{
float amplitude;
if (AtoB)
{
amplitude += Time.deltaTime * period;
}
else
{
amplitude -= Time.deltaTime * period;
}
amplitude = Mathf.Clamp(amplitude, 0, 1);
Vector3 location = Vector3.Lerp(a, b, amplitude);
Transform.position = location;
if (amplitude == 1)
{
AtoB = false;
yield return new WaitForSeconds(waitTime);
}
if else (amplitude == 0)
{
AtoB = true;
yield return new WaitForSeconds(waitTime);
}
else
{
yield return false;
}
}

Unity2D: Enemy doesn't follow Player when in its radius

Hey Guys I've been having a problem lately that I cant seem to solve.
A sprite is supposed to roam around (as it does) while nothing is inside its radius, however if the player moves close to it the sprite should theoretically move towards it and stop roaming.
The sprite doesn't follow the player and cant even see its tag since I cant even see the contents of the "Collider2D[] hits".
using System.Collections.Generic;
using UnityEngine;
public class FireCultist : MonoBehaviour
{
public float moveTimeSeconds; //Time it will take object to move, in seconds.
private float xMax = 10.0f; // The boundaries of the spawn area
private float yMax = 10.0f;
private float xMin = -10.0f; // The boundaries of the spawn area
private float yMin = -10.0f;
public int xDistanceRange; // The max distance you can move at one time
public int yDistanceRange;
private BoxCollider2D boxCollider; //The BoxCollider2D component attached to this object.
private Rigidbody2D rb2D; //The Rigidbody2D component attached to this object.
private float inverseMoveTime; //Used to make movement more efficient.
public Vector2 start;
public Vector2 end;
public bool roam = true;
public Collider2D[] hits;
void Start()
{
boxCollider = GetComponent<BoxCollider2D>();
rb2D = GetComponent<Rigidbody2D>();
inverseMoveTime = 1f / moveTimeSeconds;
InvokeRepeating("RandomMove", 0.0f, 5.0f);
}
void Update()
{
Collider2D[] hits = Physics2D.OverlapCircleAll(transform.position, 10); // returns all colliders within radius of enemy
int i = 0;
while(hits.Length > i)
{
Debug.Log("Sees");
Debug.Log(hits[i]);
i++;
}
followPlayer();
if (roam)
{
Debug.Log("Roam");
transform.position = Vector2.MoveTowards(transform.position, end, inverseMoveTime * Time.deltaTime); //Random move to new position
}
}
public void followPlayer()
{
foreach (Collider2D hit in hits)
{
if (hit.tag == "Player") // if the player is within a radius
{
Debug.Log("Chasing Player");
transform.position = Vector2.MoveTowards(transform.position, GameObject.Find("Prefabs/Player").GetComponent<Transform>().position, inverseMoveTime * Time.deltaTime); // chase player
roam = false;
}
else
{
Debug.Log("Continues");
roam = true; // Continue RandomMove()
}
}
}
public void RandomMove() // gets random coordinates near enemy and moves there
{
float xDistance = Random.Range(-xDistanceRange, xDistanceRange); // check
float yDistance = Random.Range(-yDistanceRange, yDistanceRange);// check
if (xDistance < xMax && xDistance > xMin && yDistance < yMax && yDistance > yMin && roam == true) // If within boundaries of walking space
{
start = transform.position;
end = start + new Vector2(xDistance, yDistance);
Debug.Log("Roaming From : " + start + " To : " + end);
}
}
}
The roaming algorithm works however not too sure about the tag detection.
The script belongs to this enemy object
Player Object Properties

It looks like you are declaring a new hits variable during every update instead of using your class-level variable. This means the variable inside of followPlayer() will never be instantiated, and the information will not be passed between the two methods.
Try this:
void Update()
{
hits = Physics2D.OverlapCircleAll(transform.position, 10);
//...
}
You might also consider attaching a trigger collider to the enemy which sends a notification when the player enters/exits the trigger instead of relying on OverlapCircleAll()
void OnTriggerEnter2D(Collider2D col)
{
if(col.gameObject.tag == "Player"){
roam = false;
}
}
void OnTriggerExit2D(Collider2D col)
{
if(col.gameObject.tag == "Player"){
roam = true;
}
}

Why is the camera not rotating to face the first waypoint?

When the game starts, a random waypoint is selected from an array. The camera should then rotate to face the selected random waypoint and start moving towards it.
Once the camera has reached the waypoint, it should wait 3 seconds before rotating to face and move towards the next random waypoint.
The problem I have is in Start(). The camera does not rotate to face the first waypoint before it starts moving towards it. Instead, it moves towards the first waypoint backwards. Then, when it reaches the waypoint, it waits 3 seconds to rotate and move towards the next waypoint.
It's working fine except that the camera does not rotate to face the first selected random waypoint. It's moving to it backward without first rotating to face it.
Here's my code:
The waypoints script
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Waypoints : MonoBehaviour
{
public GameObject[] waypoints;
public GameObject player;
public float speed = 5;
public float WPradius = 1;
public LookAtCamera lookAtCam;
private int current = 0;
private bool rot = false;
public void Init()
{
waypoints = GameObject.FindGameObjectsWithTag("Target");
if(waypoints.Length > 0)
{
StartCoroutine(RotateFacingTarget(waypoints[UnityEngine.Random.Range(0, waypoints.Length)].transform));
}
}
void Update()
{
if (waypoints.Length > 0)
{
if (Vector3.Distance(waypoints[current].transform.position, transform.position) < WPradius)
{
current = UnityEngine.Random.Range(0, waypoints.Length);
rot = false;
StartCoroutine(RotateFacingTarget(waypoints[current].transform));
if (current >= waypoints.Length)
{
current = 0;
}
}
if (rot)
transform.position = Vector3.MoveTowards(transform.position, waypoints[current].transform.position, Time.deltaTime * speed);
}
}
IEnumerator RotateFacingTarget(Transform target)
{
yield return new WaitForSeconds(3);
lookAtCam.target = target;
rot = true;
}
}
The look at camera script
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class LookAtCamera : MonoBehaviour
{
//values that will be set in the Inspector
public Transform target;
public float RotationSpeed;
//values for internal use
private Quaternion _lookRotation;
private Vector3 _direction;
// Update is called once per frame
void Update()
{
//find the vector pointing from our position to the target
if (target)
{
_direction = (target.position - transform.position).normalized;
//create the rotation we need to be in to look at the target
_lookRotation = Quaternion.LookRotation(_direction);
//rotate us over time according to speed until we are in the required rotation
transform.rotation = Quaternion.Slerp(transform.rotation, _lookRotation, Time.deltaTime * RotationSpeed);
}
}
}
How can I fix this?

Let's assume that Waypoints.Init() is being called and your waypoints variable has an array of 3.
Waypoints.Init() starts a coroutine
Your coroutine waits 3 seconds
After 3 seconds, you set your camera target which Slerps to face the position
Update on its first frame says waypoints.Length > 0 == true
It's not close to its target, and rot is false, so it does not move
Now, you're waiting 3 seconds, not rotating, and not moving.
Your coroutine's 3 second wait time is up and starts the rotation toward your target
rot is now true at the start of your rotation, so your Update method starts moving toward the target as well
It would seem that your logic is off in how the order of operations works. If it needs to act as you describe, I suggest that you operate on the target differently.
I've implemented the following using an enum:
Waypoints
public class Waypoints : MonoBehaviour
{
private GameObject[] waypoints;
private Transform currentWaypoint;
private enum CameraState
{
StartRotating,
Rotating,
Moving,
Waiting
}
private CameraState cameraState;
public GameObject player;
public float speed = 5;
public float WPradius = 1;
public LookAtCamera lookAtCam;
private int current = 0;
private bool isCameraRotating = false;
void Start()
{
cameraState = CameraState.StartRotating;
}
void Update()
{
switch (cameraState)
{
// This state is used as a trigger to set the camera target and start rotation
case CameraState.StartRotating:
{
// Sanity check in case the waypoint array was set to length == 0 between states
if (waypoints.Length == 0)
break;
// Tell the camera to start rotating
currentWaypoint = waypoints[UnityEngine.Random.Range(0, waypoints.Length)].transform;
lookAtCam.target = currentWaypoint;
cameraState = CameraState.Rotating;
break;
}
// This state only needs to detect when the camera has completed rotation to start movement
case CameraState.Rotating:
{
if (lookAtCam.IsFinishedRotating)
cameraState = CameraState.StartMoving;
break;
}
case CameraState.Moving:
{
// Move
transform.position = Vector3.MoveTowards(transform.position, currentWaypoint.position, Time.deltaTime * speed);
// Check for the Waiting state
if (Vector3.Distance(currentWaypoint.position, transform.position) < WPradius)
{
// Set to waiting state
cameraState = CameraState.Waiting;
// Call the coroutine to wait once and not in CameraState.Waiting
// Coroutine will set the next state
StartCoroutine(WaitForTimer(3));
}
break;
}
case CameraState.Waiting:
// Do nothing. Timer has already started
break;
}
}
IEnumerator WaitForTimer(float timer)
{
yield return new WaitForSeconds(timer);
cameraState = CameraState.StartRotating;
}
public void RefreshWaypoints()
{
waypoints = GameObject.FindGameObjectsWithTag("Target");
}
}
LookAtCamera
public class LookAtCamera : MonoBehaviour
{
// Values that will be set in the Inspector
public Transform target;
public float RotationSpeed;
private float timer = 0.0f;
public bool IsRotationFinished
{
get { return timer > 0.99f; }
}
// Update is called once per frame
void Update()
{
if (target != null && timer < 0.99f)
{
// Rotate us over time according to speed until we are in the required rotation
transform.rotation = Quaternion.Slerp(transform.rotation,
Quaternion.LookRotation((target.position - transform.position).normalized),
timer);
timer += Time.deltaTime * RotationSpeed;
}
}
}

How can i make the Invisible Walls script to work and take effect?

The idea is to make that when the player is walking to the edge of the terrain he will stop wont be able to continue and fall.
And in my case i want the objects that move forward when they collide with the invisible wall the object will turn lerp back and move to the other side of the invisible walls.
Another problem that might come up later i read about is that if the objects moving too fast to the invisible walls there is a bug that let them move through ? Not sure about it.
This is a screenshot showing the invisible walls. I created a box collider set the Is Trigger to be on and set the 500 600 500 same as the terrain size.
This is the script of the Invisible Walls: The script i attached it to the Terrain:
using UnityEngine;
using System.Collections;
public class InvisibleWalls : MonoBehaviour {
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
}
void OnTriggerExit(Collider other)
{
}
}
This is the script that create the space ships clone of them and make them move forward. But when they get to the edge of the terrain they just gone out. And i want them to lkerp/turn back to the other side.
This script is attached to the Spheres GameObject:
using System;
using UnityEngine;
using Random = UnityEngine.Random;
using System.Collections;
using System.Collections.Generic;
public class SphereBuilder : MonoBehaviour
{
public GameObject SpaceShip;
GameObject[] spheres;
public float moveSpeed = 50;
// for tracking properties change
private Vector3 _extents;
private int _sphereCount;
private float _sphereSize;
/// <summary>
/// How far to place spheres randomly.
/// </summary>
public Vector3 Extents;
/// <summary>
/// How many spheres wanted.
/// </summary>
public int SphereCount;
public float SphereSize;
private void Start()
{
spheres = GameObject.FindGameObjectsWithTag("MySphere");
}
private void OnValidate()
{
// prevent wrong values to be entered
Extents = new Vector3(Mathf.Max(0.0f, Extents.x), Mathf.Max(0.0f, Extents.y), Mathf.Max(0.0f, Extents.z));
SphereCount = Mathf.Max(0, SphereCount);
SphereSize = Mathf.Max(0.0f, SphereSize);
}
private void Reset()
{
Extents = new Vector3(250.0f, 20.0f, 250.0f);
SphereCount = 100;
SphereSize = 20.0f;
}
private void Update()
{
UpdateSpheres();
MoveShips ();
}
private void MoveShips()
{
foreach (Transform child in spheres[0].transform)
{
child.transform.position += Vector3.forward * Time.deltaTime * moveSpeed;
}
}
private void UpdateSpheres()
{
if (Extents == _extents && SphereCount == _sphereCount && Mathf.Approximately(SphereSize, _sphereSize))
return;
// cleanup
var spheres = GameObject.FindGameObjectsWithTag("Sphere");
foreach (var t in spheres)
{
if (Application.isEditor)
{
DestroyImmediate(t);
}
else
{
Destroy(t);
}
}
var withTag = GameObject.FindWithTag("Terrain");
if (withTag == null)
throw new InvalidOperationException("Terrain not found");
for (var i = 0; i < SphereCount; i++)
{
var o = Instantiate(SpaceShip);
o.tag = "Sphere";
o.transform.SetParent(gameObject.transform);
o.transform.localScale = new Vector3(SphereSize, SphereSize, SphereSize);
// get random position
var x = Random.Range(-Extents.x, Extents.x);
var y = Extents.y; // sphere altitude relative to terrain below
var z = Random.Range(-Extents.z, Extents.z);
// now send a ray down terrain to adjust Y according terrain below
var height = 10000.0f; // should be higher than highest terrain altitude
var origin = new Vector3(x, height, z);
var ray = new Ray(origin, Vector3.down);
RaycastHit hit;
var maxDistance = 20000.0f;
var nameToLayer = LayerMask.NameToLayer("Terrain");
var layerMask = 1 << nameToLayer;
if (Physics.Raycast(ray, out hit, maxDistance, layerMask))
{
var distance = hit.distance;
y = height - distance + y; // adjust
}
else
{
Debug.LogWarning("Terrain not hit, using default height !");
}
// place !
o.transform.position = new Vector3(x, y, z);
}
_extents = Extents;
_sphereCount = SphereCount;
_sphereSize = SphereSize;
}
}
And this is a small short video clip showing what happen to the space ships when they get to the terrain edge:
Spaceships video clip
Update what i did so far:
In top of script added:
public Terrain terrain;
private Vector3 boundLower;
private Vector3 boundUpper;
In Start function i added:
private void Start()
{
spheres = GameObject.FindGameObjectsWithTag("MySphere");
var withTag = GameObject.FindWithTag("Terrain");
if (withTag == null)
throw new InvalidOperationException("Terrain not found");
boundLower = terrain.transform.position - terrain.transform.size / 2;
boundUpper = terrain.transform.position + terrain.transform.size / 2;
}
But getting errors on both lines: size property not exist:
boundLower = terrain.transform.position - terrain.transform.size / 2;
boundUpper = terrain.transform.position + terrain.transform.size / 2;
And changed the MoveShips function to this:
private Vector3 direction = Vector3.forward;
private void MoveShips() {
foreach (var child in spheres) {
var pos = child.transform.position + direction * Time.deltaTime * moveSpeed;
pos.x = Mathf.Clamp(pos.x, boundLower.x, boundUpper.x);
pos.z = Mathf.Clamp(pos.z, boundLower.z, boundUpper.z);
if (pos.x == boundLower.x || pos.x == boundUpper.x) direction.x = - direction.x;
if (pos.z == boundLower.z || pos.z == boundUpper.z) direction.z = - direction.z;
child.transform.position = pos;
}
}

I would suggest modifying MoveShips() changing Vector3.forward to a variable and flipping it when bounds are reached:
private Vector3 direction = Vector3.forward;
private void MoveShips() {
foreach (var child in spheres) {
var pos = child.transform.position + direction * Time.deltaTime * moveSpeed;
pos.x = Mathf.Clamp(pos.x, boundLower.x, boundUpper.x);
pos.z = Mathf.Clamp(pos.z, boundLower.z, boundUpper.z);
if (pos.x == boundLower.x || pos.x == boundUpper.x) direction.x = - direction.x;
if (pos.z == boundLower.z || pos.z == boundUpper.z) direction.z = - direction.z;
child.transform.position = pos;
}
}
This will remove unnecessary dependence on object collision engine for such a simple thing. Note, how this is making all ships to change direction when furthest reaches the bound. If you want them to move separately, you will need to move this logic to a separate script and attach it to a ship prefab.
And the bounds (boundLower and boundUpper) can be set either as script variables in editor or calculated from terrain, like:
boundLower = terrain.transform.position - terrain.TerrainData.size / 2;
boundUpper = terrain.transform.position + terrain.TerrainData.size / 2;
I would also suggest to move this:
var withTag = GameObject.FindWithTag("Terrain");
if (withTag == null)
throw new InvalidOperationException("Terrain not found");
out of Update() into Start() unless you do something really funky with it in the process.

Lets start working though your problems one by one :
Question : The objects do not collide, why?
Answer : Objects do not collide from with-in the collider, only from the outside.
What you need in your case is 4 box collider, one at each edge of the map
Question : Another problem that might come up later i read about is that if the objects moving too fast to the invisible walls there is a bug that let them move through ? Not sure about it.
This is only a problem with objects moving at bullet-like speeds, you could edit the rigidbody to have detection mode : "continuous" or continuous-dynamic which will avoid this issue
The scripts, i do not think you would need them in this case, your original idea was good, just the implementation with a single collider over the whole terrain, instead of 4 seperate "wall" colliders, was the issue. As for the rest of the logic, i did not try decipher through that, thus i can not comment on it.

Add force to ball based on direction of camera

I am attempting to create a minigolf game but am having trouble solving how to calculate the direction to hit the ball. I am thinking that it is easiest to hit the ball in the forward direction that the camera is facing, but I get unexpected results after the first hit as the ball will not calculate the correct direction after hitting the first time. How can I set the direction for hitting the ball and then apply the force I am calculating?
This is my script attached to my ball object at the moment. Sorry for the messiness.
using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class Golfball : MonoBehaviour {
public GameObject ball = null;
public GameObject hole = null;
public GameObject cam = null;
public Text distance;
public Text score;
public Slider powerbar;
private int strokes = 0;
private bool isMoving = false;
private bool increasing = true;
private float distanceToHole;
public float minHitPower = 40.0f;
public float maxHitPower = 270.0f;
private float hitPower = 0;
private float powerIncrement = 5.0f;
private float powerMultiplier = 10;
private float ballRollTime = 0;
private Vector3 ballDir;
// Use this for initialization
void Start() {
distance.GetComponent<Text>().text = "Distance To Hole:" + distanceToHole;
ball.GetComponent<Rigidbody> ();
score.GetComponent<Text>().text = "Strokes:" + strokes;
}
// Update is called once per frame
void Update () {
//Allow the ball to be hit if the ball is not null, not currently moving, and the left mouse button is clicked.
if (ball != null) {
if (Input.GetButton("Fire1") && !isMoving) {
calculatePower ();
}
//Hit ball using power level and set ball to moving.
if (Input.GetButtonUp("Fire1"))
{/**********************************************
//Calculate direction to hit ball
ballDir = cam.transform.forward.normalized;
hitBall(hitPower);
isMoving = true;
}**********************************************/
//Detect when the ball stops
if (isMoving) {
ballRollTime += Time.deltaTime;
if (ballRollTime > 1 && GetComponent<Rigidbody> ().velocity.magnitude <= 0.5) {
GetComponent<Rigidbody> ().velocity = Vector3.zero;
GetComponent<Rigidbody> ().angularVelocity = Vector3.zero;
isMoving = false;
}
} else {
ballRollTime = 0;
}
}
//Calculate distance to hole
distanceToHole = Mathf.Round((Vector3.Distance(ball.transform.position, hole.transform.position) * 100f) / 100f);
distance.GetComponent<Text>().text = "Distance To Hole: " + distanceToHole;
Debug.DrawLine(ball.transform.position, ballDir, Color.red, Mathf.Infinity);
}
void calculatePower(){
//Increase power if it is less than the max power.
if (increasing)
{
if (hitPower < maxHitPower)
{
hitPower += powerIncrement * powerMultiplier;
increasing = true;
}
else if (hitPower >= maxHitPower)
{
increasing = false;
}
}
//Decrease power if power level is not increasing until the power hits the minimum level.
if(!increasing) {
//Debug.Log ("Not Increasing");
if (hitPower > minHitPower) {
//Debug.Log ("HitPower: " + hitPower);
hitPower -= powerIncrement * powerMultiplier;
} else if (hitPower <= minHitPower) {
increasing = true;
}
}
//Update the slider
powerbar.value = hitPower / powerMultiplier;
}
void hitBall (float power){
//Add force to the ball
//ball.GetComponent<Rigidbody>().AddForce(new Vector3(0, 0, power));
//Camera.main.transform.forward
ball.GetComponent<Rigidbody>().AddRelativeForce(ballDir * power);
//Increase stroke count
strokes++;
updateScore(strokes);
//Reset the power and power bar level to minimum default after hitting ball
hitPower = minHitPower;
powerbar.value = hitPower / powerMultiplier;
Debug.Log("HitPower Reset: " + hitPower);
}
void updateScore(int stroke)
{
score.GetComponent<Text>().text = "Strokes:" + stroke;
}
}

You'll have to apply the force like that:
ball.GetComponent<Rigidbody>().AddForce(ballDir * power, ForceMode.Impulse);
But you'll probably have to play with your 'power' variable.
Also note that you want to use impulse because you are hitting the ball and not applying force for some period of time.
The ballDir * power multiples the ballDir vector by your float number. You probably already know how it works, but here is the rundown:
scalarValue * new Vector(x0, x1, ..., xn) == new Vector(scalarValue * x0, scalarValue * x1, ... scalarValue * xn);]
You might also want to get rid of direction's y component so that your ball doesn't fly into the air (you are playing minigolf, right?)
ballDir.y = 0;