Opengl viewport only rendering a spot I was working on a project and I don't know how but the viewport started hiding things out of a camera range... I tried deleting the camera but it did not work.. here is how it looks like:

the archive:
https://1drv.ms/u/s!ApEztyCWw8odqnpUJSYRx8dbr_ni

EDIT: So, I think this is probably a glitch. I tried to open it with blender 2.8 and the problem just disappeared.. I cannot save it in 2.8 tho because I Still want to use it in 2.79b.
You have the Clipping Border active  Alt  +  B , hit the same shortcut to clear it. You can also find the command in the View menu in the 3D viewport header.