Develop Reference

Why can't I "unhide" my gameobject in unity by using SetActive(true)

I am making a little game and I want my character to disappear until you press space, but I don't want to destroy it since it has a script inside. I tried what I wrote below, but it didn't work.
void Start () {
gameObject.SetActive(false);
}
void Update () {
if (Input.GetKeyDown(Keycode.Space)) {
gameObject.SetActive(true);
}
Have any clues to fix it or replacement code?

You set the GameObject to disabled with SetActive(false). As a result, the Update() method is no longer executing. Because of this, the code that will unhide your character can never run.
There are many ways to get the behavior you want, but the simplest I can think of is this: Instead of disabling the entire gameobject, just disable the renderer (whether it's a sprite renderer or mesh renderer). This will make your character disappear, but this script will keep running.
Example:
public Renderer renderer; // drag your renderer component here in the Unity inspector
void Start ()
{
renderer.enabled = false;
}
void Update ()
{
if (Input.GetKeyDown(Keycode.Space))
renderer.enabled = true;
}
Another approach (and I think, better) is to create a child object of your character's GameObject, call it "Body", and place everything that deals with rendering your character in there. Then disable/enable that child gameobject as desired.

Using gameObject.SetActive(false) disables the gameObject and all its components, including the script you're running so it can't turn itself on if the script driving it is off.
If you add the script to a parent object of the object you're trying to disable you can get the effect you're looking for like this:
public gameObejct childObject;
void Start()
{
childObject.SetActive(false);
}
void Update()
{
if (Input.GetKeyDown(Keycode.Space))
{
childObject.SetActive(true);
}
}

How to activated object again in unity

I created a dot following my mouse around in 2D and I created a cube object changing position on x and y. Now when I point my mouse to cube, it deactivates I set that, and now I want to activate it again. I try on trigger exit, but it didn't work.
public GameObject tapObject;
private float respawnTime = 1f;
public float xMin;
public float xMax;
public float yMin;
public float yMax;
void Start()
{
StartCoroutine(spawnEnemyTime());
}
private void RandomSpawnObject()
{
tapObject.transform.position = new Vector2(Random.Range(xMin, xMax), Random.Range(yMin, yMax));
}
private void OnTriggerEnter2D(Collider2D collision)
{
tapObject.SetActive(false);
}
IEnumerator spawnEnemyTime()
{
while (true)
{
yield return new WaitForSeconds(respawnTime);
RandomSpawnObject();
}
}

Once inactive the scripts on that object are not executed anymore => messages like OnTriggerExit are not called/executed.
One solution is to simply wrap the target object in a parent object and attach your script to the parent instead but make it (de)activate the child.
So the parent stays active and receives the message.

I am just going to repeat what everyone else here said:
A inactive object in Unity is truly inactive, meaning it does not receive any updates, can't collide with stuff and all the MonoBehaviour stuff that usually calls your code does not work either. You have to manually re-activate the object using a reference that you cached somewhere.
But, instead of just flat out disabling the whole object you could disable the components that you don't want to be active.
Example:
private void OnTriggerEnter2D(Collider2D collision)
{
tapObject.GetComponent<Renderer>().enabled = false;
}
private void OnTriggerExit2D(Collider2D collision)
{
tapObject.GetComponent<Renderer>().enabled = true;
}
This only deactivates your renderer component but leaves everything else as it is. So your object can still collide and it's still registered via e.g. OnTriggerExit.
Keep in mind that GetComponent<T>() is a pretty expensive operation so caching your component references is a good idea. The best solution would be to start out with a reference by creating a variable for it and assign it in the inspector.
Example:
//Set in inspector
public Renderer renderer
private void OnTriggerEnter2D(Collider2D collision)
{
renderer.enabled = false;
}
private void OnTriggerExit2D(Collider2D collision)
{
renderer.enabled = true;
}

When a GameObject is not active in Unity , you can't click it(no rendering,no colliding , nothing )
But ,You can create a hotkey (new script or in other script) , that can set it back to active , if it is not active.

public GameObject GO;
Use GO.setactive(true);
whereas gameobject is the object use to define the specific thing or object which needs to be active and the whole code needs to written in the method "spawnEnemyTime" so that it could be get active after the specific time period

You can just use an empty GameObject and get a reference the object that you want to enable/disable. If you get the reference before you disable it you will be able to activate it again.
the alternative is to do what TehMightyPotato said. Disable components it's actually the best way to solve this problem, but if you have lot's of components/subcomponents disable the gameobjects is faster.

Unity - Panel is disabled and re-enabled immediately afterwards (C#)

Just need a way to get around this problem. I know what the issue is, I just need a viable solution.
So basically I have a script called MouseManager, which detects if you're looking at a specific game object and if you press "f" it tells another script, called UIManager, to open the GameObject's panel (I have a game where you can press f on a console and it enables a UI with a puzzle).
Basically, I want the user to be able to press "f" or "esc" and have it exit the panel, however if you press "f", it disables the panel but instantly re-enables it as you're still looking at the gameobject, and both checks are in Update()
I need a workaround, if anyone knows one PLEASE comment as this issue is getting on my nerves :P
Thanks
EDIT: By console I mean there's a GameObject that looks like a console.
EDIT 2: Here's the code, I'll put some comments in it so you can understand what each thing does. I will be refactoring it soon because it's messy...
void Start()
{
uiPuzzles = GameObject.Find("PuzzlesUI").GetComponentInChildren<UIManager>(); // Currently I have the UIManager set to a canvas called PuzzlesUI. I will soon be moving it to an empty GameObject.
}
void Update()
{
if (!uiPuzzles.invActive && !uiPuzzles.puzzleActive) // invActive and puzzleActive are two public booleans that just show if the inventory or any puzzle panel is empty (UIManager handles opening and closing the inventory too)
{
if (Input.GetButtonDown("Use") && !uiPuzzles.invActive && !uiPuzzles.puzzleActive) // Use key is bound to "f". Currently Im just checking if puzzleActive and invActive are still false.
{
ray = GetComponentInChildren<Camera>().ScreenPointToRay(Input.mousePosition);
if (Physics.Raycast(ray, out hit, 7)) // Raycast where you're looking
{
uiPuzzles.openPuzzleOverlay(hit.collider.name); // function in UIManager which will check if the hit collider is in a list of all the puzzle colliders currently added and if it is, open that panel.
}
}
}
}
As for UIManager:
public void openPuzzleOverlay(string collider) // Get a panel name
{
foreach (Puzzle item in puzzleList)
{
item.panelGameObject.SetActive(false); // Disable all puzzle panels.
if (item.consoleGameObject.name == collider) // unless its the given panel,
{
item.panelGameObject.SetActive(true); // then enable it.
Cursor.lockState = CursorLockMode.None; // Unlock the mouse.
Cursor.visible = true; // Show the mouse.
DisablePlayerUI(); // Disable the UI (e.g. crosshair)
puzzleActive = true; // Disable movement. (Because player movement requires puzzleActive and invActive to also be false
}
}
}
void Update ()
{
if (Input.GetButtonDown("Use") && puzzleActive && !invActive && // If you want to use a console and the puzzle is already active
!puzzleList.Where(p => p.panelGameObject.activeSelf).FirstOrDefault().panelGameObject.GetComponentInChildren<InputField>().isFocused) // Check if the currently active panel's input field is not focused.
{
ClosePuzzleOverlay(); // Close the puzzle.
EnablePlayerUI(); // Enable the UI.
}
}
public void ClosePuzzleOverlay()
{
foreach (Puzzle item in puzzleList)
item.panelGameObject.SetActive(false);
Cursor.visible = false;
Cursor.lockState = CursorLockMode.Locked;
puzzleActive = false;
}

The problem is being caused by the two input checks. When F is pressed both are true so the UI is being closed and then opened in the same frame.
Take the Input code out of UIManager and keep it in one place. Then you can rework your input class to be something like this:
//MouseManager Update
if(Input.GetButtonDown("Use")){
if(uiPuzzles.isActive)
uiPuzzles.Hide();
else
uiPuzzles.Show(GetPuzzleName());
}
Now it will only call either open or close on the frame which F is pressed down.

Clicking on an Object

So I have the map in my game split into different areas. Each are made into a separate array in the Area array. I am currently stuck on being able to click on the object. When the player clicks on the object in the game the part of the map that he clicks on should pop up a certain amount and when he clicks on another part that part should pop up and the other one should do back to its original position. I am currently having that object be destroyed when I click on it, but it won't even be selected in game.
using UnityEngine;
using System.Collections;
public class AreaSelection : MonoBehaviour {
public GameObject[] Areas;
void Start()
{
Areas = new GameObject[20];
}
void Update()
{
}
void OnMouseDown()
{
Destroy(this.gameObject);
}

"OnMouseDown is called when the user has pressed the mouse button while over the GUIElement or Collider."
-- Documentation
This means that you need a Collider on the GameObject that this script is attached to. The OnMouseDown will only trigger on the GameObject it's attached to. So if you have this script on some kind of manager that doesn't have a Collider or size or anything, you won't be able to use OnMouseDown. If you'd like to go another route, which I sort of recommend, you'd relocate the logic to the Update() method sort of like this:
(from a 2d-project of mine)
```
RaycastHit2D hit;
public LayerMask mask;
Vector2 mousePos;
GameObject selectedObject;
void Update() {
// If mouse left click is pressed
if (Input.GetMouseButtonDown(0)) {
mousePos = (Vector2)Camera.main.ScreenToWorldPoint(Input.mousePosition);
hit = Physics2D.Raycast(mousePos, Vector2.zero, mask);
if (hit.collider != null)
{
selectedObject = hit.collider.gameObject;
}
}
}
Note that you have to set the public LayerMask in the inspector to only hit the Objects you want to hit.
With this script you should be able to send a Raycast from your screen towards your mouse and, if it hits any GameObject with the selected Layer in the LayerMask it will put that object in SelectedObject (and once you have the gameobject you can do whatever you want with it).

Changing sprite after mouse click on collider (working with many colliders and many different sprites)

I won't hide that I am new to the Unity and C#. I am trying to make mini escape game.
My problem: Changing sprites using colliders works only on one object. After clicking second object it works one time and then either the first and the second object don't work.
Description:
On the main screen I will have many items that are "clickable" and some that are "pickable". I created 2 scripts- one that close up to the clicked item, and second that return to the main view.
Main view looks like that: they are 3 colliders and each one close-up to different view. Colliders are the children of the Background. After close-up I don't want the child colliders of background to be working. Only the collider of the close-up should work.
So the question: Am I doing anything wrong? Is there any better method to change sprites after mouse click?
My code:
First script:
public class GetCloser : MonoBehaviour // shows close-up of clicked object
{
public GameObject Actual, Background;
void OnMouseDown()
{
RaycastHit2D hit = Physics2D.Raycast(transform.position, -Vector2.up);
if (hit.collider != null)
{
Background.SetActive(false);
Actual.GetComponent<Collider2D>().enabled = true;
Actual.GetComponent<SpriteRenderer>().enabled = true;
}
}
}
Second script:
public class ReturnTo : MonoBehaviour //hide the close-up image and return to the background
{
public GameObject Actual, Background;
void OnMouseDown()
{
RaycastHit2D hit = Physics2D.Raycast(transform.position, -Vector2.up);
if (hit.collider != null)
{
Background.SetActive(true);
Actual.GetComponent<Collider2D>().enabled = false;
Actual.GetComponent<SpriteRenderer>().enabled = false;
}
}
}
Last script:
public class PickUp : MonoBehaviour { //hide clicked object- works every time
// Use this for initialization
void Start () {
gameObject.GetComponent<SpriteRenderer>().enabled = true;
}
// Update is called once per frame
void OnMouseDown()
{
RaycastHit2D hit = Physics2D.Raycast(transform.position, -Vector2.up);
if (hit == true && hit.collider != null)
{
hit.collider.gameObject.GetComponent<SpriteRenderer>().enabled = false;
Destroy(hit.collider);
}
}
}

So if the issue is the colliders for your main screen still being active after zoom that's simply adding in your first script "zoom script" deactivating the colliders for all background or even just simply turning the gameobjects in the background off, then when you zoom back out simply turn the objects back on or colliders back on depending on which you decided to turn off.
Wait I just reread and realize after you click the first object you are no longer able to get the other objects to react any longer. Looking over your code it is probably because you are destroying the collider in your third script therefore you are no longer able to "hit" the other objects to trigger the code of a collision.