Xna 3d子弹浴和绘制方法出错

我正在设计一款3D游戏，在这款游戏中，我在一艘宇宙飞船后面设置了一个可以移动的摄像机。我还在游戏中添加了一些小行星，我还想添加子弹。我用四元数来控制飞船和它后面的相机的路径。然而，当我在子弹上使用相同的四元数(特定的旋转，以便我可以计算子弹的路径)时，我得到了一个非常有趣的效果，路径完全错误。你知道为什么会这样吗?

public void Update(GameTime gameTime)
    {
        lazerRotation = spaceship.spaceShipRotation;
        Vector3 rotVector = Vector3.Transform(new Vector3(0, 0, -1), lazerRotation); 

        Position +=  rotVector* 10 * (float)gameTime.ElapsedGameTime.TotalSeconds;
        //
    }
    //spaceShipRotation = Quaternion.Identity;
    //Quaternion additionalRot = Quaternion.CreateFromAxisAngle(new Vector3(0, -1, 0), leftRightRot) * Quaternion.CreateFromAxisAngle(new Vector3(1, 0, 0), upDownRot);
    //spaceShipRotation *= additionalRot;
    //Vector3 addVector = Vector3.Transform(new Vector3(0, 0, -1), spaceShipRotation);
    //    futurePosition += addVector * movement * velocity;

    public void Draw(Matrix view, Matrix projection)
    {

       // //Quaternion xaxis = Quaternion.CreateFromAxisAngle(new Vector3(0, 0, -1), spaceship.leftrightrot);
       // //Quaternion yaxis = Quaternion.CreateFromAxisAngle(new Vector3(0, 1, 0), spaceship.updownrot);
       // //Quaternion rot = xaxis * yaxis;
       //Matrix x =  Matrix.CreateRotationX(spaceship.leftrightrot);
       //Matrix y = Matrix.CreateRotationY(spaceship.updownrot);
       //Matrix rot = x * y;
        Matrix[] transforms = new Matrix[Model.Bones.Count];
        Model.CopyAbsoluteBoneTransformsTo(transforms);
        Matrix worldMatrix = Matrix.CreateFromQuaternion(lazerRotation) * Matrix.CreateTranslation(Position);

        foreach (ModelMesh mesh in Model.Meshes)
        {
            foreach (BasicEffect effect in mesh.Effects)
            {

                effect.World = worldMatrix * transforms[mesh.ParentBone.Index];  //position
                effect.View = view; //camera
                effect.Projection = projection; //2d to 3d
                effect.EnableDefaultLighting();
                effect.PreferPerPixelLighting = true;
            }
            mesh.Draw();
        }
    }

记住我的宇宙飞船是子弹物体的场，这就是我如何得到宇宙飞船的。旋转四元数。