反射をコードで書く実験

Reflect.cs

using UnityEngine;
using System.Collections;

public class Reflect : MonoBehaviour {

	public float power = 10f;

	void OnCollisionEnter(Collision collision) {
		Vector3 diff = collision.relativeVelocity;
		if(diff != Vector3.zero) {
			Vector3 reflectForce = Vector3.Reflect(diff, collision.contacts[0].normal);
			collision.rigidbody.AddForce(reflectForce.normalized * power, ForceMode.Impulse);
		}
	}
}