OnTriggerEnter2D with if/else

hello,
i am currently working on my 1st game on Unity and I would like to add a gameObject that appears when the player collides with it and disappears when the player moves too far from it. Right now it can appear exactly how i wanted it to work but it won't disappear when the player goes away. Could someone please help me?

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class EnableDisable : MonoBehaviour
6. {
7.     // Start is called before the first frame update
8.     void Start()
9.     {
10.        
11.     }
12.  
13.     // Update is called once per frame
14.     void Update()
15.     {
16.         //for testing
17.         if (Input.GetKeyDown(KeyCode.X)) {
18.         GetComponent<Renderer>().enabled = false;
19.         }
20.     }
21.    
22.     void OnTriggerEnter2D(Collider2D col)
23.     {
24.         if (col.gameObject)
25.     {
26.         GetComponent<Renderer>().enabled = true;
27.     }
28.         else
29.     {
30.         GetComponent<Renderer>().enabled = false;
31.     }
32. }
33. }

 

hello, thanks for ur reply, and yeah i've tried to use OnTriggerExit2D but that didnt work, but tbh idk what col.gameObject means, i just tried something, could u explain to me what i should put there instead? thank you

 

i've seen that happen in alot of other fora (also unity) so ur straight cappin'

 

i've seen people get helped step by step on unity formum is what i meant by my last msg

 

o sorry , i will provide details here

in green at 1 is my character which is the player
at 2 is the object (a sign with the letter E) that appears when you get close (its invisible right now)
also the script i showed u earlier is placed on the E sign, not on the player
the player and the sign both have a 2D collider and the E has "istrigger" checked on

if u need more details just tell me which and i'll tell u (except for creditcard details LOL)

 

yes the player has a rigidbody2D and as i said, the E does appear when the player gets close (exactly as intended). it just doesnt wanna disappear when the player moves away from it

 

the "as i said" was meant for the sentence next to it not for the Rigidbody part
also the reason i restated that about the E appearing is because after i read your message i thought u might've missed me saying it the 1st time

 

i will read them thanks for trying to help me and i'm sorry for my noobness

 

i just read the entire pack of text u sent a couple minutes earlier and i'm not using the circle colider but a box colider, nothing is static and i made it dynamic because with kinematic the invisible walls dont work (idk how important this information is but here is it anyways) and thanks for wishign me luck

 

I might be mistaken, (apologise if so!) but from looking over this thread it seems you might be guessing how things work, instead of taking the time to understand how they work. I know it can sometimes be a drag to go away and sit and watch tutorials, but it does pay off!

Here's a few great ones to start with that are relevant to your issues:

One in regards to Colliders and Triggers:

One in regards to the differences between RigidBody Types:

One in regards to Unity's Layer system and using the collision Matrix:

 

YOOO thank u so much for fixing it up i will try to understand what u changed, (idk what the debug should do but the code works exactly like i wanted in the 1st place now thank you

 

ok thank u i will look into that (idk what it means exactly yet)

 

thank you, i will look into that . but now im trying to make it so that when the player collides with the "E-sign", and presses E while being there, the next scene starts. i tried various things but i dont think i got the "next scene" part right.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.SceneManagement;
5.  
6. public class ToScene2 : MonoBehaviour
7. {
8.     private Renderer renderer;
9.     private bool enterAllowed;
10.     private string sceneToLoad;
11. //    public static void LoadScene(string youcancallmesus, SceneManagement.LoadSceneMode mode = LoadSceneMode.Single);
12.     // Start is called before the first frame update
13.     void Start()
14.     {
15.          renderer = GetComponent<Renderer>();
16. //         SceneManager.LoadScene("youcancallmesus", LoadSceneMode.Additive);
17.     }
18.  
19.     // Update is called once per frame
20.     void Update()
21.     {
22.        
23.     }
24.    
25.      void OnTriggerEnter2D(Collider2D col)
26.         {
27.             if ((renderer.enabled = true) && Input.GetKeyDown(KeyCode.E))
28.             {
29.                 //SceneManagement.LoadScene("youcancallmesus");
30.                 sceneToLoad = "youcancallmesus";
31.                 enterAllowed = true;
32.             }
33.            
34.         }
35. }
36.  

 

I'll give you a hint, something looks wrong in your if statement within the OnTriggerEnter2D, looks to be assigning, rather than using the equality operator also renderer.enabled would be equal to true if it were so, so there's no need to even write it using the equality operator, hopefully you see what I mean.

 

How do i fix this?

it is needed because the renderer gets disabled when the character moves too far away + by default its disabled as well

 

So you'd either write:

Code (CSharp):

1. if (renderer.enabled == true && Input.GetKeyDown(KeyCode.E))

or simply:

Code (CSharp):

1. if (renderer.enabled && Input.GetKeyDown(KeyCode.E))

As long as you understand why that's different, if not then look at assigning vs the equality operator. Might help to have a basic understanding of coding, so understanding basic things like if statements, functions, loops etc if you don't already

 

Yes i understand how its different but it doesn't work, its still the exact same (nothing happens when E is pressed) but still thanks for trying

 

Stick a Debug.Log("here") within the if statement, then go to your console and see if it outputs "here" when you're inside the E and you're pressing E.

 

debug.log / console never works for me idk why

 

and there is also this

 

What do you mean it never works for you? If you Debug.Log("log working!") in your start function, does nothing show in console?

That warning message is just saying you're assigning the value, but you're never actually using it.

 

idk, the console is just always empty even if i use debug.log

ah ok ty

 

Show me what you have written in the start function

 

im not sure what u meant by the "start function" but here is the entire code

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.SceneManagement;
5. public class ToScene2 : MonoBehaviour
6. {
7.     private Renderer renderer;
8.     private bool enterAllowed;
9.     private string sceneToLoad;
10. //    public static void LoadScene(string youcancallmesus, SceneManagement.LoadSceneMode mode = LoadSceneMode.Single);
11.     // Start is called before the first frame update
12.     void Start()
13.     {
14.          renderer = GetComponent<Renderer>();
15. //         SceneManager.LoadScene("youcancallmesus", LoadSceneMode.Additive);
16.     }
17.     // Update is called once per frame
18.     void Update()
19.     {
20.      
21.     }
22.  
23.      void OnTriggerEnter2D(Collider2D col)
24.         {
25.             if ((renderer.enabled = true) && Input.GetKeyDown(KeyCode.E))
26.             {
27.                 //SceneManagement.LoadScene("youcancallmesus");
28.                 sceneToLoad = "youcancallmesus";
29.                 enterAllowed = true;
30.             }
31.          
32.         }
33. }
34.  

 

I know it's probably not what you want to hear, but perhaps take a few lessons in Unity and C-sharp if you're unaware of what the Start function is, or even what a function is. Maybe just do some Googling to understand scripting in Unity. If you're just after the answers to a very specific issue, you're not going to get very far after this issue is resolved.

Here's documentation to the Start function:
https://docs.unity3d.com/ScriptReference/MonoBehaviour.Start.html

It was in here I was referring to adding a Debug.Log in order to see a log of something working in the console. Here is the documentation to Debug.Log:

https://docs.unity3d.com/ScriptReference/Debug.Log.html