C# 为什么graphicsDevice.viewport（x，y，z，w）使用x表示x和y表示？

我正在尝试为我的XNA游戏创建一个拆分屏幕。我有一个camera类，我使用它作为相机，当需要绘制时，我调用包含以下代码的函数。cameraViewport是一个矢量4，所有值都在0,1之间。 我用的第一台相机

camera1.viewport = new vector4(0,0,1,.5f); // this works perfect

对于我正在使用的第二台相机

camera2.viewport = new vector4(0,.5f,1,.5f); // this is drawling the same view as camera1

但是当我为第二个摄像机做这个的时候

camera2.viewport = new vector3(.5f,0,.5f,.5f);

结果是，好像我把它分成了4条路，它在底部的右边，但它应该在右上角。看起来它根本不使用y值，只使用x值。为什么呢

            int x = (int)(defaultViewport.Width * CameraViewport.X);
            int y = (int)(defaultViewport.Height * CameraViewport.Y);
            int w = (int)(defaultViewport.Width * CameraViewport.Z);
            int h = (int)(defaultViewport.Height * CameraViewport.W);
            Viewport viewport = new Viewport(x, y, w, h);
            graphics.Viewport = viewport;
            this.Projection = Matrix.CreatePerspectiveFieldOfView(MathHelper.ToRadians(45), viewport.AspectRatio, .1f, 5000);

---

实际上这是我的错，错误在于我如何设置视口

Vector4 cameraViewport;
public Vecor4 viewport
{
     Vector4 newviewport = value;
     cameraViewport = new Vector4(mathhelper.clamp(newviewport.x,0,1),...  //here was my problem i was setting the y value the same as the x value i didnt even think to check here sorry for this kinda point less question unless someone else has the same problem.  
}

---

说我还有两天时间，所以我没有