Vector3.Reflect

説明

法線で定義された平面でベクトルを反射します。

The inNormal vector defines a plane (a plane's normal is the vector that is perpendicular to its surface). the inDirection vector is treated as a directional arrow coming in to the plane. The returned value is a vector of equal magnitude to inDirection but with its direction reflected.


Reflection of a vector off a plane.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public Transform originalObject;
    public Transform reflectedObject;

    void Update()
    {
        // Makes the reflected object appear opposite of the original object,
        // mirrored along the z-axis of the world
        reflectedObject.position = Vector3.Reflect(originalObject.position, Vector3.right);
    }
}