TIL
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Duke Nukem 3D isn't actually fully 3D. Like DOOM, it's actually a 2D map.
So how did Duke Nukem 3D do this?
And you know that neat bit near the beginning of the first level, where you fall down an AC shaft and onto the street?
The build engine can't do that! It's impossible!
It's actually done by teleporting!
The map above shows a more clearer example.
You start in the SQUARE area. When you jump down...
It teleports you to that lower area!
Via https://threadreaderapp.com/thread/1372766463556083715.html
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Tagged: gamedev