Mathf.SmoothStep

説明

Min と Max の間で制限したスムージングで補間します。

This function interpolates between min and max in a similar way to Lerp. However, the interpolation will gradually speed up from the start and slow down toward the end. This is useful for creating natural-looking animation, fading and other transitions.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public float minimum = 10.0F;
    public float maximum = 20.0F;
    public float duration = 5.0F;
    private float startTime;
    void Start() {
        startTime = Time.time;
    }
    void Update() {
        float t = (Time.time - startTime) / duration;
        transform.position = new Vector3(Mathf.SmoothStep(minimum, maximum, t), 0, 0);
    }
}