Now you're thinking with portals! | Doom Mapping

Here we have 2 floors, room over room. Portals don't like 3D floors, they don't play well together, so putting a 3D floor on top of a portal or vice versa is catastrophic. Not a desired outcome. To fix this just make the entire second floor a separate part of the map that the player is teleported to via massive horizontal portal. Now you can make your seamless portal to oblivion without the broken visuals.

Note: There is 1 3D floor on this map. Can you spot it?

No commentary, Quake map in Doom (work-in-progress)

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=============Doom Tools=============

Ultimate Doom Builder
https://devbuilds.drdteam.org/ultimatedoombuilder/

Slade 3
https://slade.mancubus.net/index.php?page=downloads

GZDoom
https://www.zdoom.org/downloads

ZDL
https://www.moddb.com/addons/zdl-final-fixed-version

FreeDoom
https://www.moddb.com/mods/freedoom-complete-enhanced/downloads/freedoom-complete-enhanced-v10

=============Quake Tools=============
Trenchbroom
https://trenchbroom.github.io/

Necro's CompilingGui
https://github.com/necros0/ne_q1CompilingGui

EricW-Tools
https://ericwa.github.io/ericw-tools/

Quakespasm
https://quakespasm.sourceforge.net/download.htm

Wally
https://valvedev.info/tools/wally/

Pakscape
https://valvedev.info/tools/pakscape/

=============Standard Tools=============
Notepad++
https://notepad-plus-plus.org/downloads/

Aseprite
https://www.aseprite.org/

Krita
https://krita.org/en/download/krita-desktop/

Blender
https://www.blender.org/download/

Godot
https://godotengine.org/

Tiled
https://thorbjorn.itch.io/tiled

MagicaVoxel
https://ephtracy.github.io/

Slab 6
http://www.advsys.net/ken/download.htm

.md3 Import/Export for Blender
https://jkhub.org/tutorials/modeling/md3-importexport-using-blender-33-r185/