Transform.InverseTransformDirection

Description

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

This operation is unaffected by scale.

You should use Transform.InverseTransformPoint if the vector represents a position in space rather than a direction.

using UnityEngine;

public class Example : MonoBehaviour
{
    void Start()
    {
        // transform the world forward into local space:
        Vector3 relative;
        relative = transform.InverseTransformDirection(Vector3.forward);
        Debug.Log(relative);
    }
}

Description

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

This operation is unaffected by scale.

using UnityEngine;

public class Example : MonoBehaviour
{
    void Start()
    {
        // transform the world forward into local space:
        Vector3 relative;
        relative = transform.InverseTransformDirection(Vector3.forward);
        Debug.Log(relative);
    }
}