Change value of a static variable multiple times in one script

Questions & Answers
1

I’m spawning a number of different sized enemies that move at different speeds. I control the speed with a variable called speed in another script.

I’m trying to instantiate multiple different version of said enemy with different speeds. As seen below:

level1GM.cs

using UnityEngine;
using System.Collections;

public class level1GM : MonoBehaviour {

	public GameObject enemy;
	Vector3 size9, size17;

	void Start () {
		size9 = new Vector3 (0.0f, 0.0f, 8.0f);
		size17 = new Vector3 (0.0f, 0.0f, 16.0f);

		enemyMovement.speed = 6f;
		enemy.transform.localScale += size9;
		Instantiate (enemy, new Vector3(-20.0f, 0.0f, 5.5f), Quaternion.identity);
		enemy.transform.localScale -= size9;

		enemy.transform.localScale += size9;
		Instantiate (enemy, new Vector3(20.0f, 0.0f, -5.5f), Quaternion.Euler(0.0f, 180.0f, 0.0f));
		enemy.transform.localScale -= size9;

		enemyMovement.speed = 4f;
		Instantiate(enemy, new Vector3(9.5f, 0.0f, 25.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(2.5f, 0.0f, 25.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(-1.5f, 0.0f, 25.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(-3.5f, 0.0f, 25.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(-5.5f, 0.0f, 25.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(-7.5f, 0.0f, 25.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(-9.5f, 0.0f, 25.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));

		enemyMovement.speed = 4.2f;
		Instantiate(enemy, new Vector3(-9.5f, 0.0f, 32.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(-2.5f, 0.0f, 32.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(1.5f, 0.0f, 32.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(3.5f, 0.0f, 32.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(5.5f, 0.0f, 32.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(7.5f, 0.0f, 32.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(9.5f, 0.0f, 32.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));

		enemyMovement.speed = 7f;
		enemy.transform.localScale += size17;
		Instantiate (enemy, new Vector3(-1.5f, 0.0f, 37.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		enemy.transform.localScale -= size17;
	}
}

enemyMovement.cs

using UnityEngine;
using System.Collections;

public class enemyMovement : MonoBehaviour {

	public static float speed = 1f;

	// Use this for initialization
	void Start () {
		Destroy (gameObject, 15f);
	}
	
	// Update is called once per frame
	void Update () {
		transform.Translate (speed * Time.deltaTime, 0.0f, 0.0f);
	}

	void OnCollisionEnter (Collision col){
		if (col.collider.tag == "Player") {
			Debug.Log ("Death");
		}
	}
}

But it will only use the last enemyMovement.speed because of course it’s in start. But how would I go about having different speeds of different instantiated objects? Would I need a variety of different prefabs?

Thank you.

2

It’s nothing to do with it being set in Start(). It’s because you’ve declared speed as static. Why did you do this if you want different enemies to have different speeds?

3

Managed to solve it with help from @tanoshimi

Got rid of static from the other script then used GetCompenent instead for the following:

using UnityEngine;
using System.Collections;

public class level1GM : MonoBehaviour {

	public GameObject enemy;
	Vector3 size9, size17;
	private enemyMovement enemyMovementScript;

	void Start () {
		size9 = new Vector3 (0.0f, 0.0f, 8.0f);
		size17 = new Vector3 (0.0f, 0.0f, 16.0f);

		enemyMovementScript = enemy.GetComponent<enemyMovement>();

		enemyMovementScript.speed = 6f;
		enemy.transform.localScale += size9;
		Instantiate (enemy, new Vector3(-20.0f, 0.0f, 5.5f), Quaternion.identity);
		enemy.transform.localScale -= size9;

		enemy.transform.localScale += size9;
		Instantiate (enemy, new Vector3(20.0f, 0.0f, -5.5f), Quaternion.Euler(0.0f, 180.0f, 0.0f));
		enemy.transform.localScale -= size9;

		enemyMovementScript.speed = 4f;
		Instantiate(enemy, new Vector3(9.5f, 0.0f, 25.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(2.5f, 0.0f, 25.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(-1.5f, 0.0f, 25.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(-3.5f, 0.0f, 25.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(-5.5f, 0.0f, 25.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(-7.5f, 0.0f, 25.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(-9.5f, 0.0f, 25.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));

		enemyMovementScript.speed = 4.2f;
		Instantiate(enemy, new Vector3(-9.5f, 0.0f, 32.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(-2.5f, 0.0f, 32.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(1.5f, 0.0f, 32.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(3.5f, 0.0f, 32.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(5.5f, 0.0f, 32.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(7.5f, 0.0f, 32.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		Instantiate(enemy, new Vector3(9.5f, 0.0f, 32.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));

		enemyMovementScript.speed = 7f;
		enemy.transform.localScale += size17;
		Instantiate (enemy, new Vector3(-1.5f, 0.0f, 37.0f), Quaternion.Euler(0.0f, 90.0f, 0.0f));
		enemy.transform.localScale -= size17;
	}
}

Thanks for the help. :slight_smile: