[C#] Rotating 2D object from any angle to 0

I am pretty new to Unity and C# and this sound like a simple thing to do but i still have problem to get this to work properly.

I have a few object with different rotation angles and at a certain point i want to rotate each object to the default rotation (for the test 0).

I do get the object to rotate but not stop were i want it. Would someone nice be able to show me a script that rotate an object (z) from whatever rotation to the default?

I guess i also have some problem to find the correct stopping angle, it seems like local/world position cause that.

Here is the code, in Update(), that i am playing around with. The commented lines are different options i have tested:

Code (csharp):

1.         if (isRotate) {
2.  
3. //=== The different tests
4.  
5. //          dummyGameObject.transform.Rotate(0, 0, myRotationSpeed * Time.deltaTime * posOrNeg);
6. //          dummyGameObject.transform.Rotate(Vector3.forward * Time.deltaTime * 800);
7. //          dummyGameObject.transform.Rotate(0,20 * Time.deltaTime * 500, 0);
8. //          dummyGameObject.transform.rotation = Quaternion.AngleAxis(30, Vector3.up);
9. //          dummyGameObject.transform.RotateAround (dummyGameObject.transform.position, Vector3.forward, 1000 * Time.deltaTime);
10. //          dummyGameObject.transform.Rotate(Vector3.forward, 270 * Time.deltaTime);
11.  
12.  
13.             print (dummyGameObject.transform.rotation.z);
14.  
15.             // Check rotation.z if it is 0, if so stop animation
16.             if (dummyGameObject.transform.rotation.z == 359) {
17.                 isRotate = false;
18.            
19.             }
20.         }

 

How about Vector3.RotateTowards? Docs about quaternions are also worth to check out: http://docs.unity3d.com/Documentation/ScriptReference/Quaternion.html

 

Thanks but i still does not get it to work, using this code in Update():

Code (csharp):

1. Vector3 targetDir = new Vector3(0, 0, 270);
2. dummyGameObject.transform.rotation = Vector3.RotateTowards (dummyGameObject.transform.forward, targetDir, 100f * Time.deltaTime, 0.0f);