Trigger Light

Unity Engine
1

I am building an instructional game for my students. I have 3 sample objects (Sample1, Sample2, Sample3) I need a script that turns two objects labeled Light on when Sample3 is in direct contact with GameObject TestBase. I have written the following code but this is new to me and nothing is happening. I can write the code to flip the light with space bar but not with the collision:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class on : MonoBehaviour
{
public Light myLight;

void OnCollisionEnter(Collision col)
{
if (col.gameObject.name == “Sample3”)
{
myLight.enabled = true;
}
else
{
myLight.enabled = false;
}
}
}

2

Use code tags.

Collisions callbacks have to be triggered, with a keypress you can fire a method directly but Collisions happen between two colliders with at least one non-static and having a Rigidbody component. It’s more involved than just “press a button and poof”.

1 Like
3

Thanks for the advice. I got the lights to turn on when only sample3 interacts now (yay) but the last step is for them to turn back off when contact is broken. My code is below for reference:

public class on : MonoBehaviour
{
public Light Light1, Light2;

void OnTriggerEnter(Collider col)
{
if (col.gameObject.tag == “silver”)
{
Light1.enabled = false;
Light2.enabled = false;
}
else
{
Light1.enabled = true;
Light2.enabled = true;
}
}
}

4

Posting code nicely on the forums, explained here: Using code tags properly - Unity Engine - Unity Discussions

It sounds as though you’re looking for OnTriggerExit.

1 Like
5

Thanks! That does look notably less disgusting, and now it works!!! Thank you, code below in case it helps anyone else.

public class on : MonoBehaviour
{
    public Light Light1, Light2;

    void OnTriggerEnter(Collider col)
    {
        if (col.gameObject.tag == "silver")
        {
            Light1.enabled = false;
            Light2.enabled = false;
        }
        else
        {
            Light1.enabled = true;
            Light2.enabled = true;
        }
    }
    void OnTriggerExit(Collider col)
    {
        if (col.gameObject.tag == "silver")
        {
            Light1.enabled = true;
            Light2.enabled = true;
        }
        else
        {
            Light1.enabled = false;
            Light2.enabled = false;
        }
    }
}
6

Small tip for checking tags: use ‘.gameObject.CompareTag(“TagNameHere”)’.

:slight_smile: glad it’s working for ya.

1 Like
7

using UnityEngine;
using System.Collections;

public class TriggerEvent : MonoBehaviour {

public GameObject lightBulb =null;

void OnTriggerEnter(Collider other ){

if (other.name == “player”) {

lightBulb.SetActive (true);
}

}

void OnTriggerExit( Collider other){

if (other.name == “player”) {

lightBulb.SetActive(false);
}

}

}
…
light don’t turn on and off with collision of two object whats my fault see my code i’m currently using unity 5 a lot of error i’m facing in this version