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Hello everyone, i need 3 instances of an object at 3 different positions on the x axis between x = - 4 and x = 4. Then in another script, i need these 4 objects to start a ping pong movement along the x axis. So it seems i need a static array variable. I created this code but unity gives me lots of errors. Can you help me?

Script 1 (named GameController.js)

static var xpos : float[];

function Start(){
 xpos = Random.Range (-4.0, 4.0);
    }

function LevelEnd(){
    Instantiate(enemy, Vector3(xpos[0], 0, 0), transform.rotation);
    Instantiate(enemy, Vector3(xpos[1], 0, 0), transform.rotation);
    Instantiate(enemy, Vector3(xpos[2], 0, 0), transform.rotation);
}

Script 2 (named EnemyMovement.js)

var pingpongspeed: float;

function Update () {    
    GameController.xpos += Time.deltaTime*pingpongspeed;    
    transform.position.x = Mathf.PingPong (GameController.xpos, 8.0);    
}

Answer 1

0

You first created a static variable named xpos of type float[], but then try to read it as a float (not an array).

You may need to change your script this way (it is just a suggestion):

Script 1 (named GameController.js)

function Start(){
    xpos = new float[3]; // C#-syntax, not sure if this is the same syntax in UnityScript.
    xpos[0] = Random.Range (-4.0, 4.0);
    xpos[1] = Random.Range (-4.0, 4.0);
    xpos[2] = Random.Range (-4.0, 4.0);
}

Script 2 (named EnemyMovement.js)

var pingpongspeed: float;
var id: int; // id is between 0 and 3 included, different for each instance

function Update () {    
    GameController.xpos[id] += Time.deltaTime*pingpongspeed;    
    transform.position.x = Mathf.PingPong (GameController.xpos[id], 8.0);    
}

answered Jul 13 '12 at 01:24 PM

Kryptos
7.2k ● 5 ● 32

it worked in a strange way, the istances teleport at the same position on the x axis and then start moving (following the same path).

Jul 13 '12 at 02:05 PM Mz3D

This line is responsible for it (and IMHO it does not make sense):

GameController.xpos += Time.deltaTime*pingpongspeed; // or GameController.xpos[id] in my answer

I just pointed out the modification needed for the script to run. But you may have to review the logic.

The first parameter of Math.PingPong should be a time not a position.

Jul 13 '12 at 02:16 PM Kryptos

i tried to change the code as this but the result is the same

function Update () {

transform.position.x = Mathf.PingPong (Time.time, 8.0);

}

Jul 13 '12 at 02:56 PM Mz3D

i tried to change the code as this but the result is the same

function Update () {
transform.position.x = Mathf.PingPong (Time.time, 8.0) - 4.0;
}

Jul 13 '12 at 03:04 PM Mz3D

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