Transform.forward

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public var forward: Vector3;

public Vector3 forward;

Description

The blue axis of the transform in world space.

var thrust: float;
var rb: Rigidbody;

function Start() {
	rb = GetComponent.<Rigidbody>();
}


function Update () {
	rb.AddForce(transform.forward * thrust);
}

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public float thrust;
    public Rigidbody rb;
    void Start() {
        rb = GetComponent<Rigidbody>();
    }
    void Update() {
        rb.AddForce(transform.forward * thrust);
    }
}

Another example:

	// Computes the angle between the target transform and this object
	var angleBetween = 0.0;
	var target : Transform;
	function Update () {
		var targetDir = target.position - transform.position;
		angleBetween = Vector3.Angle (transform.forward, targetDir);
	}

using UnityEngine;
using System.Collections;

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