Animate rotation in Unity3d - animation

Question

I'm working on a 2D game in Unity3D (using Orthello 2D).
Since I switched from Cocos2d and CoronaSDK, I'm wondering if there's a way of implementing the following behaviour for a sprite (or any Unity3D object) as it worked in Corona:
object = ...
transition.to ( object, { time = 1000, rotation = object.rotation + 100, onComplete = function ()
// do something
end })
So a sprite rotates by 100 degrees over 1 second.
In my script attached to a sprite I can have a rotation in my Update () function, but it's a bit different approach...

Answer 1

You can do it easily in an Update function.
float timer = 0f;
void Update()
{
if(timer <= 1)
{
// Time.deltaTime*100 will make sure we are moving at a constant speed of 100 per second
transform.Rotate(0f,0f,Time.deltaTime*100);
// Increment the timer so we know when to stop
timer += Time.deltaTime;
}
}
If you need to do another 100 degrees rotation you will just have to reset the timer.
You can see different version of the Rotate function here and more information about the lifesaver Time.deltaTime value here

Answer 2

There are several differnt ways of doing that. For example using a coroutine:
IEnumerator TweenRotation(Transform trans, Quaternion destRot, float speed, float threshold )
{
float angleDist = Quaternion.Angle(trans.rotation, destRot);
while (angleDist > threshold)
{
trans.rotation = Quaternion.RotateTowards(trans.rotation, destRot, Time.deltaTime * speed);
yield return null;
float angleDist = Quaternion.Angle(trans.rotation, destRot);
}
}