Show Inventory Sprites on GameObject

Question

So I have these three gameObjects that rotate around the player and an inventory system for ghosts that will eventually heal the player. I followed this tutorial: "https://www.youtube.com/watch?v=AoD_F1fSFFg" and am at the point where when you pickup an item, it is shown in your inventory. Instead of the sprites showing in the inventory, I want them to appear at the three gameObjects circling the player, but I am unsure on how to go about this. Please help.

public class GhostManager : MonoBehaviour
{
    public static GhostManager Instance;
    public List<Ghost> Ghosts = new List<Ghost>();

    public GameObject ghost1;
    public GameObject ghost2;
    public GameObject ghost3;

    private void Awake()
    {
        Instance = this;
    }

    public void Add(Ghost ghost)
    {
        Ghosts.Add(ghost);
    }

    public void Remove(Ghost ghost)
    {
        Ghosts.Remove(ghost);
    }

    public void ListItems()
    {
        foreach (var ghost in Ghosts)
        {
            GameObject obj = Instantiate(ghost1);
            var ghostIcon = obj.transform.Find("GhostIcon").GetComponent<Image>();

            ghostIcon.sprite = ghost.icon;
        }
    }
}

public class GhostPickUp : MonoBehaviour
{
    public Ghost ghost;
    private int maxGhosts = 3;

    void PickUp()
    {
        if (GhostManager.Instance.Ghosts.Count < maxGhosts)
        {
            GhostManager.Instance.Add(ghost);
            Destroy(gameObject);
        }
    }

    void OnTriggerEnter(Collider other)
    {
        if (other.gameObject.CompareTag("Player"))
        {
            PickUp();
        }
    }
}

[CreateAssetMenu(fileName = "New Ghost", menuName = "Ghosts/Create New Ghosts")]
public class Ghost : ScriptableObject
{
    public int id;
    public string itemName;
    public int value;
    public Sprite icon;
}

Answer 1

Option 1: you can use a UI Canvas, set it to World Space and properly position it in you hierarchy and in your scene.

In this case you can use the same sprites as for UI.

Option 2: you can use a 3D Quad and properly position it in you hierarchy and in your scene.

In this case you need to also properly set texture and material that represent your sprites.

---

Your OnTriggerEnter seems fine, your PickUp seems fine, your Add seems fine.

ListItems looks strange:

• for some reason, you instantiate ghost1 in a loop. First of all, you don't need to instantiate it, as it is already in the scene. Second, you probaly don't want to dipaly all your objects in teh same place.

• you use transform.Find("GhostIcon") to find a child of your newly created instance of ghost1 with the name GhostIcon. But I see no chidlren of ghost1 in your scene

• what you need to do is something like this:

  for (var i = 0; i < 3; i++)
  {
      // Or you can just use List<GameObject> ghostVisuals instead of ghost1, ghost2 and ghost3
      GameObject currentGhost = null;
      if (i == 0)
          currentGhost = ghost1;
      else if (i == 1)
          currentGhost = ghost2;
      else if (i == 2)
        currentGhost = ghost3;
      else
          throw new InvalidOperationException();
  
      if (Ghosts.Count > i) {
          currentGhost.SetActive(true); // We have a ghost, so enable the GameObject
  
          // Here you access the data you need for the `currentGhost`
          // e.g. if you have added a child GhostIcon to it:
          var ghostIcon = currentGhost.transform.Find("GhostIcon").GetComponent<Image>();
          ghostIcon.sprite = Ghosts[i].icon;
      }
      else {
          currentGhost.SetActive(false); // No more ghosts, disable the game object
      }
  }
  

  This way, you access each of your three ghost game object in a sequence.