Scripting Reference
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Transform.InverseTransformDirection

function InverseTransformDirection (direction : Vector3) : Vector3

Description

Transforms a direction from world space to local space. The opposite of Transform.TransformDirection.

This operation is unaffected by scale.

JavaScript 
    // transform the world forward into local space:
    private var relative : Vector3;
    relative = transform.InverseTransformDirection(Vector3.forward);
    Debug.Log(relative);
using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    private Vector3 relative;
    void Example() {
        relative = transform.InverseTransformDirection(Vector3.forward);
        Debug.Log(relative);
    }
}
import UnityEngine
import System.Collections

class example(MonoBehaviour):

    private relative as Vector3

    def Example():
        relative = transform.InverseTransformDirection(Vector3.forward)
        Debug.Log(relative)

function InverseTransformDirection (x : float, y : float, z : float) : Vector3

Description

Transforms the direction x, y, z from world space to local space. The opposite of Transform.TransformDirection.

This operation is unaffected by scale.

JavaScript 
    // transform the world forward into local space:
    private var relative : Vector3;
    relative = transform.InverseTransformDirection(0, 0, 1);
    Debug.Log(relative);
using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    private Vector3 relative;
    void Example() {
        relative = transform.InverseTransformDirection(0, 0, 1);
        Debug.Log(relative);
    }
}
import UnityEngine
import System.Collections

class example(MonoBehaviour):

    private relative as Vector3

    def Example():
        relative = transform.InverseTransformDirection(0, 0, 1)
        Debug.Log(relative)