Rotate object by 90 degrees over time.

Hi,i'd like to rotate an object by 90 degrees over a small amount of time so it would create a nice rotation effect.
For example,if i click on the right side of the screen the object would rotate by -90 degrees with a visible rotating effect,because if i simply write: transform.Rotate(0, 0, -90); then it snaps to the new rotation.

void Update()
{
if (Input.GetMouseButtonDown(0) && Input.mousePosition.x > Screen.width / 2)
{
//rotate by -90 degrees
} else if(Input.GetMouseButtonDown(0) && Input.mousePosition.x < Screen.width / 2)
{
//rotate by +90 degrees
}
}​

Thanks in advance.

 

transform.Rotate(Vector3.up * speedVariable * Time.deltaTime);
Play around with Vector3.DIRECTION to see what you want

 

Thanks,but i want it to roll,i forgot to add that,so i would like it to rotate around the z axis.
I dont really get quaternions just yet,but it might be the answer.

 

There are a few ways you could do it. You could use a coroutine and add 90 degrees to the current rotation for example. A simple way would be like so;

Code (CSharp):

1. [SerializeField]
2. private float _rotationSpeed = 5f;
3.  
4. private Quaternion _targetRot;
5.  
6. private void Awake()
7. {
8.     _targetRot = transform.rotation;
9. }
10.  
11. private void Update()
12. {
13.     if (Input.GetMouseButtonDown(0) && Input.mousePosition.x > Screen.width / 2)
14.     {
15.         _targetRot = Quaternion.AngleAxis(-90, transform.forward);
16.         //If you want to rotate each time the mouse is clicked
17.         //_targetRot *= Quaternion.AngleAxis(-90, transform.forward);
18.     }
19.     else if (Input.GetMouseButtonDown(0) && Input.mousePosition.x < Screen.width / 2)
20.     {
21.         _targetRot = Quaternion.AngleAxis(90, transform.forward);
22.         //If you want to rotate each time the mouse is clicked
23.         //_targetRot *= Quaternion.AngleAxis(90, transform.forward);
24.     }
25.  
26.     transform.rotation = Quaternion.Lerp(transform.rotation, _targetRot, _rotationSpeed * Time.deltaTime);
27. }

 

Thank you!I'm going to try this out tomorrow!