Unity - Scripting API: Transform.forward

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Description

Returns a normalized vector representing the blue axis of the transform in world space.

Unlike Vector3.forward, which is a constant direction in world space, Transform.forward is the local forward direction for this GameObject. Rotating this GameObject will change the Transform.forward direction.

The example below shows how to manipulate a GameObject’s position along the Z axis (blue axis) of the transform in world space.

Another example:

using UnityEngine;// Computes the angle between the direction of the target from this object and this object's viewing direction (forward).
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);
    }
}