Bullet.cs

struct Bullet
{
    public Vector3 position;
    public Vector3 direction;
    public float speed;
 
    public bool isActive;
 
    public void Update(float delta)
    {
        position += direction * speed *
                    GameConstants.BulletSpeedAdjustment * delta;
        if (position.X > GameConstants.PlayfieldSizeX ||
            position.X < -GameConstants.PlayfieldSizeX ||
            position.Y > GameConstants.PlayfieldSizeY ||
            position.Y < -GameConstants.PlayfieldSizeY)
            isActive = false;
 
    }
}