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[Unity]Rigidbodyの速度を表示する.

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ボールの速度が欲しい時のスクリプトの書き方の例(Rigidbody)

Ball.cs
using UnityEngine;
using System.Collections;

public class Ball : MonoBehaviour {

	private Rigidbody _rigidbody;

	void Start(){
		// 対象の
		_rigidbody = this.GetComponent<Rigidbody> ();
	}

	void Update(){

		// 1. 速度の取得の例
		// Aキーを推したら
		if (Input.GetKeyDown (KeyCode.A)) {
			// 速度ベクトルを表示
			Debug.Log ("速度ベクトル: " + _rigidbody.velocity);

			// 速度を表示
			Debug.Log ("速度: " + _rigidbody.velocity.magnitude);
		}
	}

	//2. 速度の代入の例
	// 一定速度以上になったら動きを止める

	// 物理的な挙動のため,FixedUpdateを使う.
	void FixedUpdate(){
		// もし速度が5以上だったら
		if (_rigidbody.velocity.magnitude > 5f) {
			// 速度を0にする
			_rigidbody.velocity = Vector3.zero;
			// 重力を無効にする
			_rigidbody.useGravity = false;
			//回転を0にする
			_rigidbody.gameObject.transform.rotation = Quaternion.Euler (Vector3.zero);
		}
	}
}
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