bullet issue

Question

hay guys umm ive got an error with my code but ive been playing with it and i dnt quite understand what wrong :( its say the prefab i want the instantiate is null

 var bullet:Rigidbody;
 var bulletspeed:int;
 
 
 
 function Start () {
 
 }
 
 function Update () {
                      
         if (Input.GetButtonDown("Jump"))
        {
         if (Input.GetKeyDown(KeyCode.Space)){
          var bullet: Rigidbody;
          bullet = Instantiate(bullet,transform.position,transform.rotation);
 }
 }
 }

Answer 1

no, this is a mess.

here's the script, fixed with notes. Make sure you read it and understand what is happening :

 // this is the bullet that is copied and cloned
 // it need to be a prefab with a rigidbody
 // it needs to then be dropped here in the Inspector
 var bulletPrefab : Rigidbody; 
 
 // this is the force applied when the bullet is instantiated
 var initialForce : float = 200.0;
 
 function Start () {
 
 }
 
 function Update() 
 {
     // check if Jump OR Space has been pressed
     // OR is written like this ||
     // e.g. if ( something == 1 || anotherthing == 2 ) 
      
     if ( Input.GetButtonDown("Jump") || (Input.GetKeyDown(KeyCode.Space) )
     {
         var bulletClone : Rigidbody; // this is the clone of the bullet
         bulletClone = Instantiate( bulletPrefab, transform.position, transform.rotation );
         
         // push the bullet when it is created ** note ForceMode.Impulse
         bulletClone.AddForce( bulletClone.transform.forward * initialForce, ForceMode.Impulse );
     }
 }

I suggest you follow this video series, they are only about 5 mins each, and a great start to learning how to use Unity, components and scripts.

Start at the bottom and work up : http://www.unity3dstudent.com/category/modules/essential-skills/

Start at the bottom and work up : http://www.unity3dstudent.com/category/modules/beginner/

this is the YouTube link for the above as one playlist : http://www.youtube.com/watch?v=-oXYHNSmTxg&list=PL27B696FB515608D2&feature=plcp

the Unity Wiki : http://wiki.unity3d.com/index.php/Tutorials

A list of resources : http://answers.unity3d.com/questions/12321/how-can-i-start-learning-unity-fast-list-of-tutori.html

http://forum.unity3d.com/threads/132628-How-to-help-the-Absolute-Beginner