Transform.forward 向前

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
	public void Awake() {
		rigidbody.velocity = transform.forward * 10;
	}
}

// Set's the rigidbody velocity to be
// along the blue axis of the transform
//设置刚体的速度沿着物体的蓝色轴移动
rigidbody.velocity = transform.forward * 10;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
	public float angleBetween = 0.0F;
	public Transform target;
	void Update() {
		Vector3 targetDir = target.position - transform.position;
		angleBetween = Vector3.Angle(transform.forward, targetDir);
	}
}

// Computes the angle between the target transform and this object
//计算目标变换和这个物体之间的角度
var angleBetween = 0.0;
var target : Transform;
function Update () {
	var targetDir = target.position - transform.position;
	angleBetween = Vector3.Angle (transform.forward, targetDir);
}