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Question by Zack-Londres · Feb 27, 2013 at 08:24 AM · raycastdestroyrandomnullreferenceexceptionraycastall

Broadcast Message using RaycastAll

there are two objects in the path of the Raycast that i need to destroy. The code starts with the function called "goprime()". from there it randomly decides if each direction will destroy the objects in front. i end up getting a null ref exception. here is the code

 #pragma strict
 var direction;
 var did = false;
 function Start () {
 
 }
 
 function Update () {
 
 }
 
 
 function goprime (){
 if(!did){
 did = true;
 gonorth();
 gosouth();
 goeast();
 gowest();
 }
 }
 
 function gonorth(){
 var number = Random.Range (1,3);
 if(number < 2){
 
 var hits : RaycastHit[];
 if(Physics.RaycastAll(transform.position, Vector3.forward,8)){
  for (var i = 0;i < hits.Length; i++) {
 var hit : RaycastHit = hits[i];
 hit.collider.BroadcastMessage  ("die");
   
    } }
 }
 }
 
 function gosouth (){
 var number = Random.Range (1,3);
 if(number < 2){
 
 var hits : RaycastHit[];
 if(Physics.RaycastAll(transform.position, Vector3.back,8)){
  for (var i = 0;i < hits.Length; i++) {
 var hit : RaycastHit = hits[i];
 hit.collider.BroadcastMessage  ("die");
    } }
 }
 }
 
 function goeast(){
 var number = Random.Range (1,3);
 if(number < 2){
 
 
 var hits : RaycastHit[];
 if(Physics.RaycastAll(transform.position, Vector3.left,8)){
  for (var i = 0;i < hits.Length; i++) {
 var hit : RaycastHit = hits[i];
 hit.collider.BroadcastMessage  ("die");
   
    } }
 }
 }
 
 function gowest (){
 var number = Random.Range (1,3);
 if(number < 2){
 
 var hits : RaycastHit[];
 if(Physics.RaycastAll(transform.position, Vector3.left,8)){
  for (var i = 0;i < hits.Length; i++) {
 var hit : RaycastHit = hits[i];
 hit.collider.BroadcastMessage  ("die");
    } 
 }}
 }


Im getting a null ref exception when it tries to access the collider. it says collider isn't part of RaycastAll[].

Any and all help is appreciated. this is the last code i need to work for my game to be functional. if anyone has any thought at all please say it. i dont even care if its bone head stupid. it might be something dumb i missed.

Thanks =)

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Answer by Tarlius · Feb 27, 2013 at 08:51 AM

You aren't assigning the return value for RaycastAll

 var hits : RaycastHit[] = Physics.RaycastAll(transform.position, Vector3.left,8);
 if(hits.Length > 0){

On a side note, you could simplify your code a fair bit by doing something like:

 function GoDirection(dir : Vector3){
     var number = Random.Range (1,3);
     if(number < 2){
         var hits : RaycastHit[] = Physics.RaycastAll(transform.position, dir,8);
         if(hits.Length > 0){
             for (var i = 0;i < hits.Length; i++) {
             var hit : RaycastHit = hits[i];
             hit.collider.BroadcastMessage  ("die");
          }
     }
 }

Then calling, for example:

 void GoNorth() {
     GoDirection(Vector3.forward);
 }

On that note, your east and west both shoot left.

(Disclaimer: I don't speak js, but this should give you the idea)

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avatar image Zack-Londres · Feb 28, 2013 at 01:08 AM 0
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ok cool. that worked out well. Thanks soo much!

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