Shooting a ball by cloning it

Questions & Answers
1

I have a problem. I can’t get my script to do anything in-game, even though I have everything set. Nothing happens when I press space. Can anyone help me, please?

var ballPrefab:Transform;
var ballSpeed:float = 200; 
function Update () {
	if(Input.GetKeyDown(KeyCode.Space)){
    var ball :Transform= Instantiate(ballPrefab,
        transform.Find("SpawnPoint").transform.position,
        Quaternion.identity);
    ball.rigidbody.AddForce(transform.forward*ballSpeed); 
}

Answer: The ball wasn’t set in the hierarchy “player” Ball Prefab. I thought it was enough to set it on the assets tab, straight on the script but it seems that’s useless. Guess my manual isn’t very clear. Thank you everyone!

3

I believe your error can be fixed easily. I downloaded you project and selecting the player object in the Hierachy panel reveals that the scrip component has a field named ballPrefab. With nothing assigned. What you do is :

Select the Player object in the hierachy panel.

On the asset explorer navigate to the folder that contains the ball.

Drag the ball to the field in the script.

2

We need more context. Check to make sure your behaviour is assigned to a gameobject in your scene, and that there are no errors occurring.

4

I made some additions, but in the future, please format your code like I show in the new version.

It’s easier to read, and debug.

Drop the ball prefab in the inspector, and the spawnpoint as well.

Here ya go:

#pragma strict

var speed = 5.0f;
var rotateSpeed:float ;
var sphere:GameObject;
var child:Transform;
var ballPrefab:Rigidbody;
var ballSpeed:float = 200;
var spawnPoint:Transform; 

function Update () {

	if(Input.GetKeyDown(KeyCode.Space)){
		
		var ball = Instantiate(ballPrefab, spawnPoint.position,   spawnPoint.rotation) as Rigidbody;
		ball.rotation = Quaternion.LookRotation(ball.velocity);
    	ball.rigidbody.AddForce(transform.forward*ballSpeed); 
	}
	
    transform.Translate(Vector3(0, 0, Input.GetAxis("Vertical")) * Time.deltaTime * speed);
    transform.Rotate(Vector3(0, Input.GetAxis("Horizontal"), 0) * rotateSpeed * Time.deltaTime);
    
    if(Input.GetKeyDown(KeyCode.E)){
    
        sphere = GameObject.CreatePrimitive(PrimitiveType.Sphere);
        sphere.transform.position = transform.position;
        sphere.transform.position.y = transform.position.y+4;
        sphere.transform.parent = transform;
    }
    
    if(Input.GetKeyDown(KeyCode.Q)){
    
        sphere.transform.parent = null;
    }
       //….
    if(Input.GetKeyDown(KeyCode.R)){
    
        child = transform.Find("Head");
        child.renderer.material.color = Color.red;
    } 
    
    else if(Input.GetKeyDown(KeyCode.B)){
    
        child = transform.Find("Head");
        child.renderer.material.color = Color.blue;
    }
    
    else if(Input.GetKeyDown(KeyCode.Y)){
    
        child = transform.Find("Head");
        child.renderer.material.color = Color.yellow;
    }
    
    if(Input.GetKeyDown(KeyCode.R)){
        
        	if(!rigidbody){
        	
            	gameObject.AddComponent(Rigidbody);
            	rigidbody.constraints = RigidbodyConstraints.FreezeRotationX |
                RigidbodyConstraints.FreezeRotationZ;
                
        		}
    		}
    	}
    	
function FixedUpdate () {

    if(rigidbody){
    
        rigidbody.AddForce(Vector3(0,0,Input.GetAxis("Vertical"))*speed); 
        rigidbody.AddTorque(Vector3(0,Input.GetAxis("Horizontal"),0)*rotateSpeed); 
    } 
}

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5

You are missing a closing bracket for your if statement, and it should be

var ball : Transform = Instantiate(ballPrefab, GameObject.Find("SpawnPoint").transform.position, Quaternion.identity);

instead of transform.Find.

However, if you are going to be pressing the spacebar often, then it would be best to set SpawnPoint as a variable, instead of finding it every time.

var spawnPoint : Transform;
function Start () {
	spawnPoint = GameObject.Find("SpawnPoint").transform;
}