One thing you might try, and this is what I do with some of my Terragen renders, is pull the camera waaaaay back then, set my target as dead center of the map while the camera position is slightly south of dead center. This still gives a fairly good "top-down" view, but also adds just a tiny bit of isometric view as well, but, usually, not too much to grossly hide things.

As I don't know anything about Vue, I'm not sure if this is a possibility for you or not, but when I have my settings right, I've got a bit of space to work with as far as cropping things out to be nice and square.

GW