How can I make a game where there are 3 quests which each require 3 items to be picked up,

I know how to add a collider on to each asset that will be picked up but I dont know how to make so that once the 3 items have been collected, you go on to the next quest to collect 3 more different items.

 

you could have something like this

you have an empty gameObject , or really any gameObject that is always in the game
and you have it be QuestHandler and you make it handle the quest status

then you have your objects you collect, with the collision detection
and when you pick up the item

you use this to change the variable on the QuestHandler

Code (CSharp):

1.  
2. //Reference script A in script B
3. private QuestHandler questHandlerScript;
4.  
5. //put this line in start()  or awake()
6. questHandlerScript = GetComponent<QuestHandler>();
7.  
8. //change variable in other script
9. questHandlerScript.itemsCollected++;
10.  

and the QuestHandler looks sorta something like this, maybe you want to make it different, this is just a basic idea.

Code (CSharp):

1.  
2. public int itemsCollected = 0;
3. bool quest00Complete = false;
4. bool quest01Complete = false;
5. bool quest02Complete = false;
6.  
7. Update
8. if(itemsCollected == 3)
9. {
10.     quest00Complete = true;
11. }
12.  
13. if(itemsCollected == 6)
14. {
15.   quest01Complete = true;
16. }
17.  
18. if(itemsCollected == 9)
19. {
20.   quest02Complete = true;
21. }
22.  

or

Code (CSharp):

1.  
2. public int itemsCollected = 0;
3. int questState = 0;
4.  
5. Update
6. if(questState == 0 && itemsCollected == 3)
7. {
8.   itemsCollected = 0;
9.   questState = 1;
10. }
11.  
12. if(questState == 1 && itemsCollected == 3)
13. {
14. itemsCollected = 0;
15. questState = 2;
16. }
17.  
18. if(questState == 2 && itemsCollected == 3)
19. {
20. itemsCollected = 0;
21. questState = 3;
22. }

 

or just make a Quest where you can fill a list of object to be found.
you can place a trigger that activates this quest where you want, and call on quest.IsFinished to see if you found all the items.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using System.Collections.Generic;
4.  
5. public class Quest : MonoBehaviour
6. {
7.     public bool isActive;
8.     public List<GameObject> itemsToCollect;
9.     //assuming you have an inventory with a list of items
10.     public Inventory inventory;
11.     private bool  isFinished;
12.  
13.     public bool IsFinished
14.     {
15.         get
16.         {
17.             for(int i=0; i<itemsToCollect.items.Count; i++)
18.             {
19.                 if(!inventory.items.Contains(itemsToCollect[i]))
20.                     return false;
21.                 else
22.                     return true;
23.             }
24.         }
25.     }
26. }

 

I have very little Unity Knowledge as I only started using C# in September so I'm not sure with some of it, It's my first time trying to make a quest system too. would it be possible to make the quest system through an OnTriggerEnter so that when the FPS controller gets within a certain distance, the quest will be activated and once the pickups have been collected, the player will return to activate the next quest,

I appreciate the help

 

This is very easy to do... if you learn Unity first:

http://unity3d.com/learn

 

just keep a list of all your quests and keep a reference to your current active quest. once that returns IsFinished activate the next in line.