Hey Frederick,
Amateur answer for you here....

The "size" of your object seems to matter with how Max coded the image generation. So if a single object, small enough is the target, then you get a great image.

If its "larger"-"Offset"-"Multiple objects" in viewport, then it gets truncated like you show...

This part of the configuration code seems to control a "Zoom Factor" which controls how much can fit in a "centered view"

........
vp.zoom(1.2);
...........

Look in the ObjLibrary.menu.htm file

So my amateur answer is you can set a larger value to "zoom out" and have it fit your larger object or scene

An "expert answer" could take a better look at the code and see if it could be a more "dynamic size" for all related scenarios...

Anyway.... Thats all i got.

Maybe someone else will jump on it....