标题翻译
Problems with custom 3d renderer in java
问题
所以我最近开始在Java中制作自己的3D渲染器。我已经制作了一个立方体和一个可以用WASD和鼠标移动的相机。我只有一个问题：
当相机看向其他地方或者立方体的一个点位于显示器的角落时，渲染器会出现问题（它会渲染一个不应该被绘制的多边形）。
经过调试，我发现渲染器想要在x: -142500的位置渲染一个点（远离我的1500x1500窗口）。然后我尝试通过实现屏幕剪裁来修复这个问题（这样142500的x坐标将被移动到屏幕的边缘）。然而，这也没有起作用 
我会非常感谢任何帮助。
问题（红色部分是边缘，蓝色条纹区域是白色三角形应该渲染的位置）
英文翻译
So I have recently started on my own 3D renderer in Java. I have made a cube and a camera that can be moved with WASD and mouse. I have just one problem:
When the camera looks away or a point of the cube ends up on the corner of the display the renderer freaks out (it renders a polygon that shouldn't be drawn).
After debugging I saw that the renderer wanted to render a point at x: -142500 (way out of my 1500x1500 window). I then tried to fix this by implementing screen clipping (so that 142500 x coordinate would be moved to the edge of the screen). Well, that didn't work either
I would appreciate any help.
The problem (the red is where the edge is and the blue striped area is where the white triangle should have rendered)
Edit: dropbox jar file
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