[aruametello]

> (...) I think they built or used a different engine designed to take advantage of the N64s graphics hardware.

Something around that, they used the build engine as a starting point but "hacked it to oblivion". On the very least it reuses the same level editor (maps are vanilla build editor compatible) and it does keep many of the old bugs, like "killer doors".

semi random source: https://forums.duke4.net/topic/9513-release-zero-hour-resour...

incidentally the predecessor "duke nukem 64" is already more akin to what gzdoom is by using polygons instead of 2.5 rendering for walls and floors and they decided to push for polygons in the actors too for "zero hour" release.