CODEWITHSUNDEEP
c#unity-game-engine
Leeroyskiy Games
Leeroyskiy Games

Reputation: 21

How to make a trigger only for one of objects?

I have a car in my game with 4 wheels(Unity3D):

image

Also i have a trigger of EndLevel:

image2

But after when im going throght the trigger its trying to work 4th times How can i change it?

I tried to add my "Player(car)" inside EndGame object but its didnt fix my problem.

    using UnityEngine;

    public class EndTrigger : MonoBehaviour
    {
        public GameManager gameManager;
       void OnTriggerEnter()
        {
            gameManager.CompleteLevel();

        }
    }

Upvotes: 2

Views: 3139

Answers (2)

derHugo
derHugo

Reputation: 90862

First of all note that OnTriggerEnter(Collider other) requires a parameter of type Collider otherwise it wouldn't get called at all.

Flag

The simplest solution might be adding a bool flag as already mentioned by Eric Warburton's answer.

Layers

I would prefer to rather tackle the origin of the issue and suggest using different Layers and then configure the Layer-based collision detection via the Edit→ProjectSettings→Physics→ Layer Collision Matrix.

  1. Create a Layer e.g. END and assign it to your goal collider object. Make this object not Is Trigger and rather attach your script checking for OnTriggerEnter here.

  2. Create a Layer e.g. Player create a new dedicated invisible object with a collider and enable Is Trigger here. This object has the only purpose of colliding with the goal collider nothing else. Assign the Player layer here.

  3. Configure the collision matrix thus that END only collides with Player and nothing else. And Player only collides with END and nothing else - or maybe later another effect layer like e.g. PowerUps ;)

    enter image description here

You can create up to 24 custom layers and make use of the already existing ones so this should hold up a while

Tags

Another alternative to the Layers is using Tags

As previously I would make the END object not a trigger but rather use one on the Player.

Then you can simply compare the tag using CompareTag

void OnTriggerEnter(Collider other)
{
    if (!other.CompareTag("Player")) return;

    gameManager.CompleteLevel();
}

in very very complex games this might be sometimes better since you can create a lot more Tags than Layers.

Upvotes: 2

Eric Warburton
Eric Warburton

Reputation: 329

Well there are a few things that I can think of trying.

You can make sure that only one of your colliders is a trigger. There should be a bool check in the properties to uncheck for your wheels.

You can also do something like creating a counter or a bool that prevents the OnTriggerEnter() from firing multiple times if you only want it to fire once. You can reset it at the start of levels if needs be.

Something like

void OnTriggerEnter()
{
    if (!gameManager.IsLevelComplete)
        gameManager.CompleteLevel();
}

Inside the gameManager script

public bool IsLevelComplete { get; set; }

public void CompleteLevel()
{
    IsLevelComplete = true;
    //Do stuff
}

Upvotes: 0

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