Version: 2017.1
public static Quaternion Lerp (Quaternion a, Quaternion b, float t);

Description

Interpolates between a and b by t and normalizes the result afterwards. The parameter t is clamped to the range [0, 1].

This is faster than Slerp but looks worse if the rotations are far apart.

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.Lerp(from.rotation, to.rotation, Time.time * speed); } }

See Also: Slerp. LerpUnclamped.