The Marathon engine could sort of do this. It was similar to the doom engine in that maps where laid out as polygons on a flat plane, but different in that you

The Marathon engine could sort of do this. It was similar to the doom engine in that maps where laid out as polygons on a flat plane, but different in that you could have overlapping polygons, which allowed the devs to do something like this: https://www.youtube.com/watch?v=9WxeeiqWrn4 https://www.youtube.com/watch?v=9WxeeiqWrn4