Why I cant attach a script from a prefab to another prefab?,Why i cannot attach a script from a prefab in another prefab?

Questions & Answers
1

Hi, Im doing a rocket and I have referenced another script to take the position of the fire point to calculate the speed, but in the inspector I cant attach the script to the prefab. How can I solve this??

public class Rocket : MonoBehaviour {

    float currentSpeed;
    public float speed = 0.25f;
    public AnimationCurve curvi;
    public Weapon weapon;
        
    public Rigidbody2D rb;
    private void Start()
    {
        weapon.GetComponent<Weapon>();
    }
    
    void FixedUpdate () {
        rb.velocity = transform.right * speed;
	}
	
	
	void Update () {
        currentSpeed = Vector2.Distance(weapon.firePoint.position, transform.position);
       
        speed = curvi.Evaluate(currentSpeed);
       
	}
2

Hello.

You are missunderstanding somethig…

You declare a Weapon variable (i supose its the script you talking about) as public. So I understand yopu pretend to attach via inspector this variable.

Then in Start, you do this:

weapon.GetComponent<Weapon>();

What’s this? whats the objective of this line? What you think is doing? i does nothing, you dont give any “order”, dont assigne any value to any variable, its not a “command”. ITs like you say:

“Get the component of this object” … And I ask and what? if you acces it is to do something, change a value, assign it to a variable, destroy it, something… but you dont do anythig there…

You can do this: Replace declaration of “Weapon” varaible to be a GameObject type variable, so you can assign the gameobject to the variable via inspoector. Then acces its component to assign it to your private “weapon” variable

public class Rocket : MonoBehaviour {

 float currentSpeed;
 public float speed = 0.25f;
 public AnimationCurve curvi;
 public GameObject weaponObject;

 private Weapon weapon;

 public Rigidbody2D rb;

 private void Start()
 {
     weapon = weaponObject.GetComponent<Weapon>();
 }
 
 void FixedUpdate () {
     rb.velocity = transform.right * speed;
 }
 
 void Update () 
 {
     currentSpeed = Vector2.Distance(weapon.firePoint.position, transform.position);        
     speed = curvi.Evaluate(currentSpeed);        
 }

See the diference??

You can directly assign the Weapon variable without need of declaring first the object, but i done this to show you the “logic” of all steps. As i see you have some missunderstandings about declarations and relation betwen objects and compoentns, you should spend some time watching more tutotrials about this.

Bye! :smiley: