RotateAround x degrees over y time

Questions & Answers
1

At the moment I have the following code:

if (Input.GetKeyDown(KeyCode.A))
{

		transform.RotateAround (Vector3.zero, transform.up, 5 * Time.deltaTime);

	}

This rotates the object as I want to along the surface of my sphere however I’d like to make it do this 5 degree rotation over y seconds on button press. The most obvious way that I can think of is to have a timer variable however there must be a less convoluted way to rotate the object and have it stop exactly at 5 degrees.
I’d appreciate any help - please let me know if more information is required.

2

I’m not completely sure of your requirements. Making some assumptions, here is how I might code it if I did not want to use a timer:

 #pragma strict
    private var sphere : Transform;
    private var trCenter : Transform;
    private var qTo : Quaternion;
    var speed = 5.0;
 
    function Start(){
        sphere = GameObject.Find("Sphere").transform;
        
        trCenter = new GameObject().transform;
        trCenter.rotation = sphere.rotation;
        trCenter.parent = sphere;
        trCenter.position = sphere.position;
        transform.parent = trCenter;
        qTo = transform.localRotation;
    }
 
    function Update() {
        if (Input.GetKeyDown(KeyCode.H)) {
            var axis = Vector3.Cross(transform.right, transform.position - sphere.transform.position);
        	var q = Quaternion.AngleAxis(5.0, axis);
        	qTo = q * qTo;
        }
 
        trCenter.localRotation = Quaternion.RotateTowards(trCenter.localRotation, qTo, speed * Time.deltaTime);   
    }

What it does is create a game object and place it at the origin. The physical game object that you want to rotate around the sphere is then made a child of the empty game object. Quaternion.RotateTowards() rotates at a specified speed. In this case I set the seed to 5.0 which means a 5 degree rotation will take 1 second. If you wanted it to take 1/2 second, you could set speed to 10.0. Or if you really wanted to specify time, you could create a time variable and set speed to ‘5.0 / time’ for a five degree rotation. Rotation is applied to the empty game object at the origin, and the physical game object as a child goes along for the ride. To me this is not simpler than using a timer, and it would take some additional code to prevent the keypress during rotation.