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Question by Lolgab123 · Jan 21, 2015 at 10:14 AM · c#nullreferenceexceptionruntimepublicaccessing from any script

Problems accessing other script's variable

Hey guys! I'm making a game in which you have two scripts (for now): One main that is attach to the camera and calculate the MousePosition to use it and another one that needs to access it too.

Here are the scripts:

Script One

 public class Spawner : MonoBehaviour
 {
     public Vector3 worldPosition;
 
     void FixedUpdate()
     {
         Vector3 mousePosition = Input.mousePosition;
         mousePosition.z = 2f;
         worldPosition = camera.ScreenToWorldPoint(mousePosition);
     }
 }

Script Two

 public class PreSpawner : MonoBehaviour
 {
     public Spawner spawner;
     
     void FixedUpdate()
     {
         float wpX = spawner.worldPosition.x;
     }
 }

Now, each time I hit Play, it returns this error at each frame:

NullReferenceException: Object reference not set from an instance of an object PreSpawner.FixedUpdate() (at Assets/Scripts/PreSpawner.cs:7)

I read some post on that question, but none of the answers seemed to fit my situation.

Anobody can help with it??

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avatar image persijn · Jan 21, 2015 at 10:27 AM 1
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See comment above.

Or you could just public Spawner = GetComponent(OtherScript);

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Answer by ramp · Jan 21, 2015 at 12:35 PM

Hello,

Your code is working fine,need to expose references to other objects to the inspector. Below you can drag a game object(i.e. Main Camera) that contains the Spawner script on the spawner slot in the inspector. Below i attached screenshot like this,may be help.

alt text


screen shot 2015-01-21 at 5.39.44 pm.png (28.1 kB)
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avatar image Lolgab123 · Jan 21, 2015 at 04:58 PM 0
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Thanks! I tried to drag the script itself and it didn't work... So now I know how to! But I make it in runtime using GameObject.Find(). It will be hard to use the Inspector because pretty all my game is generated in runtime ;)

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