Quaternion.Slerp

Description

Spherically interpolates between from and to by t.

	// Interpolates rotation between the rotations "from" and "to"
	// (Choose from and to not to be the same as 
	// the object you attach this script to)

	var from : Transform;
	var to : Transform;
	var speed = 0.1;
	function Update () {
		transform.rotation =
		  Quaternion.Slerp (from.rotation, to.rotation, Time.time * speed);
	}

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public Transform from;
    public Transform to;
    public float speed = 0.1F;
    void Update() {
        transform.rotation = Quaternion.Slerp(from.rotation, to.rotation, Time.time * speed);
    }
}

import UnityEngine
import System.Collections

public class ExampleClass(MonoBehaviour):

	public from as Transform

	public to as Transform

	public speed as float = 0.1F

	def Update() as void:
		transform.rotation = Quaternion.Slerp(from.rotation, to.rotation, (Time.time * speed))