Question by viktoria93 · Jul 13, 2017 at 12:30 PM · scripting problem nullreferenceexception script error

NullExecption in a communication between two scripts

This error drives me nuts. I create a method, which returns a string with all visible objects.

 public static Renderer[] renderers;
 public static List<string> objNr = new List<string>();
 //...
 public static string myMethod (Renderer[] renderers) {
     foreach (var renderer in renderers) {
         if (IsVisible (renderer)) {
             objNr.Add (renderer.name);
         }
     }
     string itemsInOneLine = string.Join (", ", objNr.ToArray());
     return itemsInOneLine;
     objNr.Clear ();
 }

Another script takes captures from a model and should name them with all those above detected objects:

 //taking screenshots just every few seconds
 IEnumerator takingShots() {
     while (Time.frameCount <= 434) {
         string name = string.Format ("{0}/{1:D04}"
            + Camera.main.transform.position + "_"
            + CheckAllVisibleObjects.myMethod (CheckAllVisibleObjects.renderers) + ".png", folder,
               Time.frameCount);
         Application.CaptureScreenshot (name);
         yield return new WaitForSeconds (0.1f);
     }
 }

So far it should work, but if I try to run both scripts, I get the error

 NullReferenceException: Object reference not set to an instance of an object
 CheckAllVisibleObjects.myMethod (UnityEngine.Renderer[] renderers) (at Assets/Scripts/CheckAllVisibleObjects.cs:25)
 CaptureAlongPath+<takingShots>c__Iterator0.MoveNext () (at Assets/Scripts/CaptureAlongPath.cs:28)
 UnityEngine.SetupCoroutine.InvokeMoveNext (IEnumerator enumerator, IntPtr returnValueAddress) (at C:/buildslave/unity/build/Runtime/Export/Coroutines.cs:17)
 UnityEngine.MonoBehaviour:StartCoroutine(IEnumerator)
 CaptureAlongPath:Start() (at Assets/Scripts/CaptureAlongPath.cs:17)

I know this error comes from the takingShots()-Method, but I can't fix it.

Thank you for any help!

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