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This script is in a prefab. When I run the script, Unity says... "NullReferenceException: Object reference not set to an instance of an object"

function StartAtARandomSpot( zdepth : float )
{
    var campos : Vector3 = Vector3(Random.Range(0,scrWidth), scrHeight+80, zdepth);
    campos = Camera.main.ScreenToWorldPoint (campos);
    transform.position = campos;
    originalSpawnPoint = transform.position;    
}

Any help would be greatly appreciated.

Answer 1

0

Make sure that your camera is tagged as MainCamera, or "Camera.main" won't work. Otherwise, I've verified that your script is fine. Although, you could simplify it to:

function StartAtARandomSpot( zdepth : float )
{
    var campos : Vector3 = Vector3(Random.Range(0,scrWidth), scrHeight+80, zdepth);
    originalSpawnPoint = transform.position = Camera.main.ScreenToWorldPoint (campos);
}

(Note that you don't even need the campos variable, but for readability you could easily justify keeping it)

answered Sep 23 '10 at 07:07 AM

Marowi
4.9k ● 4 ● 14 ● 53

Didn't realise you could double up your '='s there. Nice. My camera is tagged as MainCamera, but sadly the bug still remains.

Sep 23 '10 at 07:12 AM Billamu

Are you sure that the error is about the ScreenToWorldPoint line? If you comment it out, does the error still occur? If I put this code into an empty script on a new object, it works fine.

Sep 23 '10 at 07:30 AM Marowi

I've been tinkering with things and I've found that the prefabs were originally in the Heirachy; I was using an object pool on them. I've found that when I revert to instantiating the prefabs the problem goes away.

Sep 23 '10 at 08:35 AM Billamu

Glad you solved it - sorry that I couldn't help, beyond telling you that your script was fine!

Sep 23 '10 at 08:40 AM Marowi

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Why won't my script see the main camera?

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