Works in Unity, but can't be build

Question

Hey guys, I kinda have a very confusing problem here.

I use following script for experiment purposes:

var objectPrefab : Transform;

function Update() { var count = Input.touchCount;

 for (i=0;i&lt;count;i++)
 {
     var touch : Touch = Input.GetTouch(i);

     if (touch.phase == TouchPhase.Began) {
         var testObject = Instantiate (objectPrefab, transform.position, Quaternion.identity);
         testObject.rigidbody.AddForce (transform.forward *2000);
     }
 }

}

The script is attached to the camera, co u can shoot objects from the camera if you touch the screen. And in the Unityplayer, with unity remote it works like a charm. But when I try to build it I get:

Assets/Scripts/Joystick 1.js(13,31): BCE0019: 'rigidbody' is not a member of 'UnityEngine.Object'.

and

Error building Player because scripts had compiler errors UnityEditor.HostView:OnGUI()

Why does it work in the player, but doesnt build itself? When I click on the error he shows me the "testObject.rigidbody.AddForce (transform.forward *2000);" Line.

Answer 1

Best Answer

Answer by Bunny83 · Feb 27, 2011 at 03:38 PM

I'm not an iPhone developer (i'm a win. user) but i read somewhere that you have to use strict typing on iPhone but i'm not sure about that. Anyways, t$$anonymous$$s error looks like that's what you have to do. Instantiate returns always a reference of type UnityEngine.Object. The real type is of course Transform but that's figured out at runtime due to dynamic typing. Try t$$anonymous$$s:

var testObject : Transform = Instantiate (objectPrefab, transform.position, Quaternion.identity) as Transform;
testObject.rigidbody.AddForce (transform.forward *2000);

EDIT
In UnityScript (as far as i know) the "as-cast" is the only way to do an explicit cast. In C# you also have the C-style casting:

Transform testObject = (Transform)Instantiate (objectPrefab, transform.position, Quaternion.identity);

For more information on scripting in general and casting see t$$anonymous$$s reference:
http://answers.unity3d.com/questions/5507/what-are-the-syntax-differences-in-c-and-javascript

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drGsus 1 · Feb 27, 2011 at 04:09 PM 0

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yeah, your code works perfect. But why is it like this? what does "as Transform" change?

Bunny83 · Feb 27, 2011 at 04:16 PM 0

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It explicitly casts the returned reference (which is of type Object) into the type Transform. Take a look at this wikipedia article about typecasting: http://en.wikipedia.org/wiki/Type_conversion I'm not sure if the second type of casting works on iPhone. I'll add the second method as well.

Works in Unity, but can't be build

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