Why is my send message not working?

I have an asteroid script that has different size asteroids, and I want them to damage my space station according to size, so large is 20 off the armour, medium is 10 and small is 5.

so im trying to get my different size asteroids send a message to the space staion script to minus the appropriate armour when hit.

on the asteroid script i have:

Code (CSharp):

1.  public GameObject newGrange;
2.  
3. private int asteroidSizeDamage;
4.  
5. void Start()   {
6.     newGrange = GameObject.FindWithTag("NewGrange");
7. }
8.  
9. void OnTriggerEnter2D(Collider2D other)
10.     {
11.         //Check to see if bullet
12.         if (other.CompareTag("PlayerLaser"))
13.         {
14.             //Debug.Log("Hit by:" + other.name);    to print what collided with your object
15.             Destroy(other.gameObject);
16.             //check asteroid size, spawn in next smaller size
17.             if (asteroidSize == 3)
18.             {
19.                 asteroidSizeDamage = 20;
20.                 newGrange.SendMessage("DamageByAsteroids", asteroidSizeDamage);
21.              }
22.       }
23.  
24.  

Then on my other script, the space station one i have a function:

Code (CSharp):

1. void DamageByAsteroids(int damageByAsteroids)
2.     {
3.         stationArmour -= damageByAsteroids;
4.         Debug.Log(damageByAsteroids);
5.     }

but why is DamageByAsteroids greyed out like its not been used?

also, its not printing.

 

nobody knows what your .SendMessage function does

and also , there is no "SendMessage" function in the GameObject API, am i missing something

 

Hi Terraya sendMessage is not the function, damageByAsteroids is.
I'm trying to send the asteroids damage amount to minus it off my space stations armour when it gets hit by an asteroid.

https://docs.unity3d.com/ScriptReference/GameObject.SendMessage.html

 

I would recommend to get the component and call it over there

 

Because it's not being used. At least, as far as the compiler is aware it isn't. SendMessage is an archaic and unreliable way of calling methods. Why not just use

GetComponent<YourComponent>().DamageByAsteroids(asteroidSizeDamage);

?

Then the compiler will know about your method being called.

 

I'm told all the kool kids are using interfaces. But what do I know?

Using Interfaces in Unity3D:

https://forum.unity.com/threads/how...rereceiver-error-message.920801/#post-6028457

https://forum.unity.com/threads/manager-classes.965609/#post-6286820

 

Ok thanks all!!! Ha Ha Kurt yes, you have talked about interfaces. It freaked me out a bit. Will look at it again, and again, and again, and again.

 

That's the right attitude ^^. Just learn your tools to be able to decide when and how to use them.

 

Note that your method has to be public for GetComponent<> to be able to call it. (For SendMessage it doesn't.)
Regardless, your method should be calling and the Debug.Log should be printing, not sure what's up.