Smooth 90 degree turn

I modified a script that Joachim Ante wrote a while ago to try to create a smooth 90 turn but it doesn't want to work.

The idea is that you hit the 'b' key to turn 90 degrees to the right. I have it working another way but it is frame dependent so I wanted to improve upon it.

Code (csharp):

1.  
2.  
3. var startrotation = 270;
4.  
5. function Update () {
6.  
7.     if (Input. GetKeyDown ("b")) {
8.         StartCoroutine("Slerp", 1.0);
9.     }
10. }
11.  
12. function Slerp (time : float)
13. {
14.   var curroation : Vector3;
15.   var newrotation : Vector3;
16.   var originalTime = time;  
17.      
18.     curroation = Vector3(0, startrotation, 0);
19.     newrotation = Vector3(0,(startrotation + 90),0);
20.  
21.     startrotation = startrotation + 90;
22.  
23.    while (time > 0.0)
24.    {
25.       time -= Time.deltaTime;
26.       transform.rotation = Quaternion.Slerp(curroation, newrotation, time / originalTime);
27.       yield;
28.    }
29. }
30.  

Thoughts?

 

I did some digging and found my error.

Code (csharp):

1.  
2. var startrotation = 270;
3.  
4. function Update () {
5.  
6.     if (Input. GetKeyDown ("b")) {
7.         StartCoroutine("Slerp", 1.0);
8.     }
9. }
10.  
11. function Slerp (time : float)
12. {
13.     var curroation = Quaternion.Euler(0, startrotation, 0);
14.     var newrotation = Quaternion.Euler(0, (startrotation + 90), 0);
15.     var originalTime = time;  
16.  
17.     startrotation = startrotation + 90;
18.  
19.    while (time > 0.0)
20.    {
21.       time -= Time.deltaTime;
22.       transform.rotation = Quaternion.Slerp(newrotation, curroation, time / originalTime);
23.       yield;
24.    }
25. }
26.