Start coroutine on a target hit by a raycast ?

Hello there, I'm currently struggling with the following issue :

I am using a raycast to interact with gameObjects in my game, basically saying "if they are in range and you press E interaction time"; however I am currently attempting to make it so that upon pressing interact, the object hit by the raycast, which will always have a certain script, start a coroutine.
However I find myself unable to do so. Any help would be much appreciated.

Is there perhaps a way for the gameobject to detect if he is being hit by a raycast ?

If you need any further information in order to assist, feel free to ask them and I'll do my utmost to answer as best I can.

 

On the object being hit:

Code (CSharp):

1. public void StartDoingSomething() {
2.   StartCoroutine (MyCoroutine());
3. }

In the raycast code:

Code (CSharp):

1. if (Physics.Raycast(..., out RaycastHit hit)) {
2.   hit.collider.GetComponent<MyScript>()?.StartDoingSomething();
3. }

Obviously replace the names of things with your actual script and method names.

 

How are you performing your raycast? When a raycast is performed, you have a parameter for a Raycasthit, that variable will provide information on what it has hit. From that, you can look for the class on the hit object and call a method on it if it is there.

 

You can output the results of a Physics.Raycast to a RaycastHit, which contains the Collider & Transform reference of the object it hit. From there, you can reference the GameObject by either using

collider.gameObject

or

transform.gameObject

, followed by

GetComponent

to get the script on that object you're looking for, and finally, starting a coroutine on that script.

Example:

Code (CSharp):

1. public class SomeScript : MonoBehaviour {
2.    public void DoTheThing() => StartCoroutine(TheThing());
3.  
4.    private IEnumerator TheThing() {
5.       //etc...
6.    }
7. }

Code (CSharp):

1. public class SomeOtherScript : MonoBehaviour {
2.    void Raycast() {
3.       RaycastHit hit;
4.  
5.       if(Physics.Raycast(/*etc..*/)) {
6.          if(hit.transform.gameObject.TryGetComponent(out SomeScript someScript)) {
7.             someScript.DoTheThing();
8.          }
9.       }
10.    }
11. }

(If you're not familiar with

TryGetComponent

, see the docs: https://docs.unity3d.com/ScriptReference/Component.TryGetComponent.html)

 

Thank you very much for the answers, I'll be sure to try them out as soon as I can !