Using Vector3 to make a bullet shoot in the direction the player is facing

Questions & Answers
1

I’m creating a top down shooter. In my update function, I control the camera and player movement. I also have a function that shoots. However, I’m having trouble getting the bullets to come straight out of the point I have set on the tip of the weapon, called bulletSpawnPoint. It’ll shoot straight if the player is facing straight, but shoots backwards when facing left, right, or backwards.

    void Update()
{
    //Player face mouse
    Plane playerPlane = new Plane(Vector3.up, transform.position);
    Ray ray = UnityEngine.Camera.main.ScreenPointToRay(Input.mousePosition);
    float hitDist = 0.0f;

    if(playerPlane.Raycast(ray, out hitDist))
    {
        Vector3 targetPoint = ray.GetPoint(hitDist);
        Quaternion targetRotation = Quaternion.LookRotation(targetPoint - transform.position);
        targetRotation.x = 0;
        targetRotation.z = 0;
        playerObj.transform.rotation = Quaternion.Slerp(playerObj.transform.rotation, targetRotation, 7f * Time.deltaTime);
    }
    //Player Movement
    if (Input.GetKey(KeyCode.W))
    {
        transform.Translate(Vector3.forward * movementSpeed * Time.deltaTime);
    }
    if (Input.GetKey(KeyCode.A))
    {
        transform.Translate(Vector3.left * movementSpeed * Time.deltaTime);
    }
    if (Input.GetKey(KeyCode.S))
    {
        transform.Translate(Vector3.back * movementSpeed * Time.deltaTime);
    }
    if (Input.GetKey(KeyCode.D))
    {
        transform.Translate(Vector3.right * movementSpeed * Time.deltaTime);
    }

    //Shooting
    if (Input.GetMouseButtonDown(0))
    {
       Shoot();     
        gunAudio.Play();
    }

}

void Shoot()
{
    Instantiate(bullet, bulletSpawnPoint.transform.position, playerObj.transform.rotation);
}

I was told that using a Vector3 when instantiating my bullet would fix this. But how would I do this? Everything I’ve tried gives me an error or makes it so the bullet doesn’t come out of the tip of the weapon

2

The simplest way to copy the forward direction of an gameobject is using the transform.forward property.

void Shoot()
{
     var bulletInstance = Instantiate(bullet);
     bullet.transform.position = bulletSpawnPoint.transform.position;
     bullet.transform.forward = player.transform.forward;
}

Im not sure whats causing your errors from the information given, so please provide more information in the future if you want a proper answer (what kind of error, the line in the code etc.)

By the way you dont need to manualy check the direction keys to get a movement direction. A better way would be to use the Input class GetAxis function.

void Move(){
   var horDirection = Input.GetAxis("Horizontal") * Vector3.right;
    var verDirection = Input.GetAxis("Vertical") * Vector3.forward;
    var dir = horDirection + verDirection;
    transform.Translate(dir * Time.deltaTime * movementSpeed);
}