The two things I find most fascinating working on #DoomsdayEngine are 1) the renderer, and 2) built-in scripting.
Doomsday Script is a somewhat Python-like custom language that integrates deeply with the rest of the engine. It is rather underutilized at the moment, but it has huge potential — eventually I intend to have it run the console, game menus, custom game logic, world events, finale/in-game overlays, ...
Today's new feature is: https://manual.dengine.net/ded/thing#on_touch
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