How to make a trigger when a Collider hits a different collider

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public GameObject planetone;

//Makes Planet One

 void Planetone () {
 
 int coinflip = Random.Range(1,3);
 
 if (coinflip == 1){
 
 int size = Random.Range (300, 500);
 
 //int x = Random.Range(-8000,-10000);
 
 int x = -8000;
 
 int y = 0;
 
 int z = 0;
 
 planetone = GameObject.CreatePrimitive(PrimitiveType.Sphere);
 
 planetone.name = "Planet One";
 
 planetone.transform.localScale = new Vector3 (size, size, size);
 
 planetone.transform.position += new Vector3(x,y,z);
             
 SphereCollider ponesSphereCollider = planetone.GetComponent();
 
 ponesSphereCollider.radius = 2;
 
 ponesSphereCollider.isTrigger = true;
             
 Rigidbody ponesRigidBody = planetone.AddComponent();
 
 ponesRigidBody.constraints = RigidbodyConstraints.FreezePositionY;
 
 ponesRigidBody.angularDrag = 0;
 
 ponesRigidBody.useGravity = false;
 
     }
 
 }

 void OnTriggerEnter (Collider planetone) {
     Application.LoadLevel ("PlanetOne");
     }

I want to make it so that when another object with a collider or rigidbody passes through planet ones sphere collider it will switch to the PlanetOne Scene.

do i need to put anything in reference to the void OnTriggerEnter (Collider planetone) { Application.LoadLevel (1); } in my Start or Update ? and if so, how should i write it

Answer 1

Answer by haim96 · Jan 02, 2014 at 04:43 PM

did you check that the colider marked as trigger on your gameobject?

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KitsuShadow · Jan 02, 2014 at 09:43 PM 0

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Yes its marked as trigger when I run the script.

do i need to put anything in reference to the void OnTriggerEnter (Collider planetone) { Application.LoadLevel ("PlanetOne"); } in my Start or Update ? and if so, how should i write it

haim96 · Jan 02, 2014 at 10:33 PM 0

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did you add "PlanetOne" scene to the project scene list?

KitsuShadow · Jan 02, 2014 at 10:51 PM 0

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Yes, its there. I think im missing something with the trigger function and it not being used in Start or Update.

Answer 2

Answer by KitsuShadow · Jan 03, 2014 at 03:47 AM

So as it stands now i can make the scene transfer but its instantaneous. I changed the code to look like this and now it wont scene transfer again.

public class SpawnSun : MonoBehaviour {

 public GameObject sun;
 public GameObject planetone;
 public SphereCollider ponesSphereCollider;
 public GameObject planettwo;
 public GameObject planetthree;
 public GameObject planetfour;
 public GameObject planetfive;
 public GameObject planetsix;
 public GameObject planetseven;
 public GameObject planeteight;
 public GameObject planetnine;
 private float BaseOrbitSpeed = 0.05f;

void Planetone () {

     int coinflip = Random.Range(1,3);

     if (coinflip == 1){

         int size = Random.Range (300, 500);

         //int x = Random.Range(-8000,-10000);
         int x = -8000;
         int y = 0;
         int z = 0;

         planetone = GameObject.CreatePrimitive(PrimitiveType.Sphere);
         planetone.name = "Planet One";
         planetone.transform.localScale = new Vector3 (size, size, size);
         planetone.transform.position += new Vector3(x,y,z);
         
         ponesSphereCollider = planetone.GetComponent<SphereCollider>();
         ponesSphereCollider.radius = 2;
         ponesSphereCollider.isTrigger = true;
         
         Rigidbody ponesRigidBody = planetone.AddComponent<Rigidbody>();
         ponesRigidBody.constraints = RigidbodyConstraints.FreezePositionY;
         ponesRigidBody.angularDrag = 0;
         ponesRigidBody.useGravity = false;
         //ponesRigidBody.collisionDetectionMode = CollisionDetectionMode.ContinuousDynamic;

     }

 }

 void OnTriggerEnter (Collider ponesSphereCollider) {

     if (ponesSphereCollider.CompareTag("Player")) {

         Application.LoadLevel (1);
         Debug.Log ("Trigger has been hit.");
     }


     }

void Update() { OnTriggerEnter (ponesSphereCollider); }

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Key_Less · Jan 03, 2014 at 05:25 AM 1

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When the trigger event is sent, the Collider parameter will contain the collider info of the object that has entered the trigger. So, make sure the object that is colliding with the trigger has it's tag set to "Player"

 if(ponesSphereCollider.gameObject.tag == "Player")
 {
    Application.LoadLevel(1);
 }

$$anonymous$$ind you, as soon as an object with a tag "Player" collides with the trigger, your "PlanetOne" level will load immediately. If you want to delay the loading, you could use a coroutine or Invoke method, for example:

 void OnTriggerEnter (Collider ponesSphereCollider) 
 {
    if (ponesSphereCollider.gameObject.tag == "Player") 
    {
       // This will call the LoadLevel method after 3 seconds.
       Invoke("LoadLevel", 3);
    }
 }
 
 void LoadLevel()
 {
    Debug.Log ("Level 1 is loading.");
    Application.LoadLevel (1);
 }

KitsuShadow · Jan 03, 2014 at 05:42 AM 0

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I took your suggestions and edited my script. See the attached video for my current issue. Still wont trigger.

http://www.twitch.tv/kitsushadow/c/3486408

KitsuShadow · Jan 03, 2014 at 06:22 PM 1

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EXCELLENT, WERE IN BUSINESS!

Thank You Very $$anonymous$$uch $$anonymous$$ey_Less

Key_Less · Jan 03, 2014 at 06:23 PM 0

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I'm not sure if I'm completely understanding your issue, but as long as your object is active, the script will always run.

Anyways, you can attach scripts to objects by using AddComponent.

 // This adds the "YourScript" component to THIS game object.
 var scriptHandle = gameObject.AddComponent<YourScript>();
 scriptHandle.CallYourScript$$anonymous$$ethod();

If you want to add the component to another object, make sure you have a valid handle to that object by using a public GameObject variable and assigning that object by dragging and dropping it onto your main script via the Unity Inspector.

 // Attach this script to an object in the scene.
 public class $$anonymous$$ainScript : $$anonymous$$onoBehaviour
 {
    // Assign this variable by dragging and dropping your
    // game object onto it via the Unity Inspector.
    public GameObject yourGO;
 
    void Start ()
    {
       // $$anonymous$$ake sure you have a valid handle to your game obj.
       if(yourGO != null)
       {
          // You can then add your scripts to the game obj.
          yourGO.AddComponent<YourScript>();
       }
    }
 }

Key_Less · Jan 03, 2014 at 07:04 PM 0

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I've converted the comment to an answer, I'd very much appreciate it if you could mark it as answered so that it may be of use to others...and so I can gain more karma of course lol.

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Answer 3

Answer by Key_Less · Jan 03, 2014 at 05:23 PM

Cool, thanks for the video. Looks like everything is setup correctly in the scene except for one thing. I didn't see your custom script attached to the "PlanetOne" game object. In order for the trigger event to occur, you must attach your script containing the OnTriggerEnter() method to the game object that has the collider with the "Is Trigger" flag set to true.

alt text

In the picture, I've created a script called "YourScript" and have attached it to my "PlanetOne" game object. Once you select your game object, you can just drag and drop the script into the inspector window to attach it.

Inside of "YourScript" is the OnTriggerEnter() method. You do not need to call this yourself, so you can remove it from your update call. When the collision occurs, Unity will send a trigger event and your OnTriggerEnter() method will execute. Let me know if you run into any issues.

customscript.png (34.4 kB)

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How to make a trigger when a Collider hits a different collider

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