MathUtilites.cs

public class MathUtilities {

  /// <summary>
  /// Smoothly lerps between start and end positions within transition time.
  /// Uses Mathf.SmoothStep to ensure 0 - 1 translation.
  /// </summary>
  /// <param name="startPosition"> Point at which Moving should start. </param>
  /// <param name="endPosition"> Destination point. </param>
  /// <param name="startTime"> Initial time it started at. </param>
  /// <param name="transitionTime"> The maximum amount of time it should take to complete. </param>
  /// <param name="isMoving"> Whether it is still moving to the point, false if reached end point. </param>
  /// <returns> New position between points. </returns>
  public static Vector3 SmoothLerp(Vector3 startPosition, Vector3 endPosition, float startTime, float transitionTime, out bool isMoving) {
    isMoving = true;

    // calculate current percentage between 2 points.
    float timeSinceStarted = Time.time - startTime;
    float percentageComplete = timeSinceStarted / transitionTime;

    //When we've completed the lerp, we set isMoving to false
    if (percentageComplete >= 1.0f) {
      isMoving = false;
    }

    // lerp animation between 2 points.
    return Vector3.Lerp(startPosition, endPosition,
      Mathf.SmoothStep(0f, 1f, percentageComplete));
  }

  /// <summary>
  /// Smoothly Lerps between start and end positions within transition time, and then move back to start position.
  /// Uses Mathf.PingPong to allow back and forth.
  /// Uses Mathf.Smoothstep to ensure 0 - 1 translation.
  /// </summary>
  /// <param name="startPosition"> Point at which Moving should start. </param>
  /// <param name="endPosition"> Destination point. </param>
  /// <param name="startTime"> Initial time it started at. </param>
  /// <param name="transitionTime"> The maximum amount of time it should take to complete. </param>        
  /// <returns> New position between points. </returns>
  public static Vector3 SmoothPingPongLerp(Vector3 startPosition, Vector3 endPosition, float transitionTime) {

    // lerped animation between 2 points.
    return Vector3.Lerp(startPosition, endPosition,
      Mathf.SmoothStep(0f, 1f, Mathf.PingPong(Time.time / transitionTime, 1f)));
  }
}