koobas.hobune.stream
I have never seen a null reference exception like this one!
I have a null reference exception and this is the exact error : NullReferenceException: Object reference not set to an instance of an object (wrapper stelemref) object:stelemref (object,intptr,object) PlacingParts.Update () (at Assets/Scripts/BuildingRocket/PlacingParts.cs:39). I have a feeling it's the reason my snapping script isn't working ,but I don't know. Here is the script:
using UnityEngine;
using System.Collections;
public class PlacingParts : MonoBehaviour
{
public GameObject[] placedParts;
private int i;
private Transform currentPart;
public Transform centerPoint;
private int partLayerMask = 1 << 9;
private int snapPointLayer = 1 << 8;
private bool hasPlaced;
public float snapPointDistance = 5f;
void Start ()
{
i = 0;
hasPlaced = false;
}
void Update ()
{
//HOW TO PLACE THE ITEM
if (currentPart != null && hasPlaced == false)
{
//GIVES ME THE ABILITY TO MOVE THE PART/OBJECT THAT WAS JUST INSTANTIATED WITH THE PLACEITEM FUNCTION
Vector3 m = Camera.main.ScreenToWorldPoint (new Vector3(Input.mousePosition.x, Input.mousePosition.y, 12.9f +( MouseOrbitImproved.distance - 13.5f)));
currentPart.position = new Vector3(m.x,m.y,m.z);
//SET THE ITEM TO HAS PLACED SO THAT IT STOPS MOVING
if(Input.GetMouseButtonDown (0))
{
placedParts[i] = currentPart.gameObject;
hasPlaced = true;
i++;
}
}
//HOW TO PICK THE OBJECT BACK UP AFTER IT HAS BEEN PLACED
Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition);
RaycastHit hit;
if(Physics.Raycast (ray, out hit, Mathf.Infinity, partLayerMask))
{
}
if(placedParts != null && i < placedParts.Length)
{
SnapTry(currentPart, placedParts[i].transform);
}
}
void SnapTry(Transform obj1, Transform obj2) {
//WHEN CALLING THE SCRIPT OBJ1 MUST BE THE CURRENTPART
Transform[] transforms1 = obj1.GetComponentsInChildren<Transform>();
//OBJ2 HAS TO BE AN ARRAY FILLED WITH ALL THE PLACED OBJECTS TRANSFORMS
Transform[] transforms2 = obj2.GetComponentsInChildren<Transform>();
foreach(Transform tr1 in transforms1) {
foreach(Transform tr2 in transforms2) {
if (tr1.tag == "SnapPoint" && tr2.tag == "SnapPoint" && (tr1.position - tr2.position).sqrMagnitude <= snapPointDistance) {
Debug.Log ("You could snap an object here if the script was finsihed");
}
}
}
}
public void PlaceItem(GameObject b)
{
hasPlaced = false;
currentPart = (((GameObject)Instantiate(b)).transform);
}
}
I could be wrong, but I think it occurs when attempting to access an element from a null array reference:
int[] someArray = null;
someArray[42];
If you double click on the error, what line does it highlight. There is nothing at line 39 that would cause this error. Is it line 34?
Yes, it's line 34, I swear it has something to do with the array!
Wait I changed the script a bit here it is again, it is line 39.
using UnityEngine;
using System.Collections;
public class PlacingParts : $$anonymous$$onoBehaviour
{
public static GameObject[] placedParts;
private int i;
private Transform currentPart;
public Transform centerPoint;
private int partLayer$$anonymous$$ask = 1 << 9;
private int snapPointLayer = 1 << 8;
private bool hasPlaced;
public float snapPointDistance = 5f;
void Start ()
{
i = 0;
hasPlaced = false;
}
void Update ()
{
//HOW TO PLACE THE ITE$$anonymous$$
if (currentPart != null && hasPlaced == false)
{
//GIVES $$anonymous$$E THE ABILITY TO $$anonymous$$OVE THE PART/OBJECT THAT WAS JUST INSTANTIATED WITH THE PLACEITE$$anonymous$$ FUNCTION
Vector3 m = Camera.main.ScreenToWorldPoint (new Vector3(Input.mousePosition.x, Input.mousePosition.y, 12.9f +( $$anonymous$$ouseOrbitImproved.distance - 13.5f)));
currentPart.position = new Vector3(m.x,m.y,m.z);
//SET THE ITE$$anonymous$$ TO HAS PLACED SO THAT IT STOPS $$anonymous$$OVING
if(Input.Get$$anonymous$$ouseButtonDown (0))
{
hasPlaced = true;
i++;
}
if(hasPlaced == true)
{
placedParts[i] = currentPart.gameObject;
}
}
//HOW TO PIC$$anonymous$$ THE OBJECT BAC$$anonymous$$ UP AFTER IT HAS BEEN PLACED
Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition);
RaycastHit hit;
if(Physics.Raycast (ray, out hit, $$anonymous$$athf.Infinity, partLayer$$anonymous$$ask))
{
}
if(placedParts != null && i < placedParts.Length)
{
SnapTry(currentPart, placedParts[i].transform);
}
}
void SnapTry(Transform obj1, Transform obj2) {
//WHEN CALLING THE SCRIPT OBJ1 $$anonymous$$UST BE THE CURRENTPART
Transform[] transforms1 = obj1.GetComponentsInChildren<Transform>();
//OBJ2 HAS TO BE AN ARRAY FILLED WITH ALL THE PLACED OBJECTS TRANSFOR$$anonymous$$S
Transform[] transforms2 = obj2.GetComponentsInChildren<Transform>();
foreach(Transform tr1 in transforms1) {
foreach(Transform tr2 in transforms2) {
if (tr1.tag == "SnapPoint" && tr2.tag == "SnapPoint" && (tr1.position - tr2.position).sqr$$anonymous$$agnitude <= snapPointDistance) {
Debug.Log ("You could snap an object here if the script was finsihed");
}
}
}
}
public void PlaceItem(GameObject b)
{
hasPlaced = false;
currentPart = (((GameObject)Instantiate(b)).transform);
}
}
I'd get rid of the static modifier on the placedParts declaration. Also what are you assigning to that array in the inspector?
You declare the 'placedParts' variabled, but you never initialize it. That is you have a reference to an array, but you also need to declare a specific amount of space for that array. Something like:
public static GameObject[] placedParts = new GameObject[100];
That creates 100 slots in your array. If you don't know how big the array will be, you can move to a different collection type. Usually a generic List is a good choice for a variable size array. More info on collection types:
http://wiki.unity3d.com/index.php?title=Which_Kind_Of_Array_Or_Collection_Should_I_Use%3F
I am now getting an error saying that my argument is out of range. Here it is : IndexOutOfRangeException: Array index is out of range. (wrapper stelemref) object:stelemref (object,intptr,object) PlacingParts.Update () (at Assets/Scripts/BuildingRocket/PlacingParts.cs:39)
As robertbu said, us List for any array that is changing dynamically in size, not a built-in array.
While you keep incrementing i and never remove elements from the array, you will currently forever get this problem. (I cannot understand how you are trying to use an array here)
I am trying to hold all of the items I place into some type of container so I can access them all at once. At some point I will be removing them. I guess I should use a list than.
