Programming portals for my DOOM-style FPS 

I cant wait for the next video where he scraps the entire codebase and restarts from scratch!

Ah, of course. The bi-monthly developer tradition of scrapping everything you did, just to redo it.

I realized while watching this why Portal has an amber and blue glow around the portals. It's VERY hard to visually distinguish a portal without having those decorations.

I'm about half way through this video and I wanted to say something. I can honestly respect that you are capable of seeing an insurmountable problem and rather than spent 40 years kit bashing it together, you seek better solutions. Love your dedication to just creating cause you can. I'll always watch your videos because they're always so inspiring.

I like how you made that circular pit shape in your test level that choked the Doom engine during its development until they implemented BSPs.

What's funny is that GZDoom does have portals, they're used in MyHouse for the non-euclidean effect

Really cool vids like always ! It's a big inspiration to watch someone being able to code such projects and have fun !

That was great! I'm a little disappointed that you abandoned the ray-casting engine, but I get you actually wanting to build a finished game this time.

god, the shapes of the maps he's drawing are too hard for my just-woke-up brain to handle

I'm currently implementing the same code for oblique clipping planes that you mentioned, and it did give me a boost of confidence that you struggled with it too! It's very hard to figure out what's going on if something is wrong.

This engine looks SO COOL! I can't wait to see what you create with this!

you're easily the most talented indie developer on yt when it comes to coding and shit, keep it up

Funny that the comment in the OpenGL Forum (11:45) came from Eric Lengyel. He's the guy behind the "Foundations of Game Engine Development" books.

Love the video! It's awesome seeing how these portals come together and how they create weird geometry.

These portal setups are giving me some strong Antichamber vibes. Very cool.

Dude I was JUST thinking I wonder what happened to this, and I check and see 25 mins ago you posted this. Noice. Its very inspirational to see your work!

This is really impressive that you've managed it all by yourself (okay sure, external libraries, etc, but still!) Well done! Impressive stuff :)

Dude in all honestly, I think you’re a genius. Like a once in a generation genius, like a A Beautiful Mind. John Neumann. I watch your videos and literally my jaw drops at your skill in logic and programming. You’re by far the best I’ve seen. Paired with your great narration and editing, audio comping, and precise mastery of language makes your videos S tier. Thank you for giving me a look into the mind of a genius, to me you’re a wizard and what you do is magic. To think this in your mind and make it reality? You inspire me. Thank you.

Comgarats! You created something that enables level designers create a totally frustrating living hell to players.

I happen to be implementing stencil buffer portals in a Doom source port at the moment! Great video

I think it would be awesome if you made video on maybe your journey getting to the point you are at now with your development skills. I noticed on one of your streams that you mentioned that you didnt go to university, and I always find it interesting/helpful seeing other developers journeys.

"But i always think they are missing something, portals" Doom teleporters: DO I NOT EXIST??

I love your videos, theyre so inspiring. Id love to get into programming but Im having a bit of trouble motivating and getting started as a whole. Witth that, how did you start learning how to program? I really appreciate it all that you do for not just entertainment purposes but for learning

I literally yelped out "YESS!!" when i saw this video!!! been waiting so long for it!!

Faen. Du er dansk! Quite impressed with the work you've done, and the style of presentation. It's the kind of nerdy humour I love! Looking forward to next time!

You are such an inspiration to me, You are a coding magician

you're insane in the best way possible this was amazing to watch

This is something I've been interested in doing myself. Good luck! Are you planning on using a layers paradigm or node based one? I think the latter could definitely help set this project apart.

I swear these videos just keep getting better

Super awesome. Love this series!

you kind of remind me of me... I grew up on Doom, made lots of levels in the DOS WadED level editor when I was a kid. Had Doom books in elementary/junior high school. Recently read the Doom Black book several times. Working on my own game engine, got decently far, then decided to start over from scratch again. Now that I'm decently along I'm already thinking of the next version... I think that working on game engines and using them for creative coding might just be more fun than trying to make an actual game and I need to accept that!

This is great! Cant wait for the next update!

Thats really cool, you could almost model MyHouse with these portals

praise God he has uploaded

I was writing a little primitive C++ SDL2 OpenGL (glew

This is so amazing ❤ thank you so very much 🤯

Trivia: Duke3D has also used portals (or at least something very similar): mirrors are implemented by rendering the level as if the camera were behind the mirror, looking into the room where the player is standing. If you walk through them (with a noclip cheat), you'll see a "copy" of the level, with everything reversed horizontally.

14:40 "Than we have your classic infinite stairs, very non euclidian, very confusing."

if you were asked to build a shed, you would plant some trees with acorns you couldn't buy but could find, wait for the trees to grow, use the wood for the walls, go mining for the metal, build a furnace from your own gathered clay/bricks and then finally finish the task that could have taken you a few weeks, but you had to do everything yourself and take several years to do. you are not re-inventing the wheel, you are merely making your own rubber, cast, rims, etc.

You're so cool bruh. I always wanted to do these things but end up with all incomplete projects. Sucks to be me but you're amazing man.

I literally just came back to your channel after over a year and you've just uploaded.

What a coincidence, I just watched the first video just a few hours ago! I live this.

Guess what! I've got a fever, and the only prescription is more portals!

This looks aaaawesome!

this is gonna be a crazy speed game

I love how I understand nothing but still enjoy the video😂

shoutout to my bro Ominous Black Pillar always there to support your creations🔥🔥⬛

heres me praying you get into modular synthethis and design eurorack modules. Your programming skills are crazy

I'd be very interested to learn about your (neo?)vim setup : could you elaborate on that in the future ? Maybe in a specific video because I'd guess it wouldn't interest everyone ?

I’m already loving the game’s vibe

Very cool tech! I wonder if you explored the idea of moving the software renderer into a compute shader + upgrading it to a fully 3d renderer...Although that certainly wouldn't have helped with debugging. Quite the contrary actually 😅

I love non euclidean geometry like this. reminds me a lot of antichamber

the color scheme in 14:48 is really nice would be a cool (and very unique) palette for a dystopian fps portal game 😉

ahh the age old tradition of writing your own game engine, only to scrap it and use one that's already available.

Wow, this looks amazing! When you finish, may you please realease the software

I wish you uploaded more frequently but I also get why you don't, this is amazing

Bungie's Marathon actually has a lot of non-euclideon geometry within the game. It was the first FPS game that could have multiple floors over the top of each other, and the way they did it was actually by using portal based rendering. And instead of hiding it, there are multiple places within the campaign where you can find hallways that come from nowhere.

Hi, does it happen to be possible one day you explain your journey on learning programming in a such complex level? You see, this is amazing and very inspiring, and it would be cool to know how it went for you, what methods did you use, or even some tips that could be shared with us that could help us learners :) Props to the awesome work!

Awesome effort!

I'd really love a video about your vim setup!

I hope that we can use the code too to also make a game. Because i have the same dream like u had here too, thats why u got recommended too

the plot twist 6 minutes in had me at the edge of my seat

i dont understand anyof this but i like to watch so im always here

This is the first video of this project I've seen so apologies if you already have something in mind for this, but the first use case for these portals I thought of was to solve the room over room problem. You could fake overlapping rooms using portals by having them in different parts of the map but connecting them in a way that seems seamless to the player

To that comment about y-sheering, I actually always enable that effect in old game engines if it supports it; Gzdoom, dark forces source port etc: it’s strangely nostalgic for me

HELL YEAH JDH KEEP WINNING!!

Literally watched the previous video just a hour ago, let’s go 🤩

Love the vids for both the content and aesthetic. What font do you use?

I can't wait to finish the video, I Remember the last one, super interesting by the way

i know you wont see this, but you are my favorite youtuber out of all. Your videos have helped me learn and inspired me to learn a completely new level of programming. Thank you and keep making great content

2:51 Euclid having one last laugh

Dаmn that's looking cool. Now what about mirrors and a support of alpha textures? Would be cool to see those implemented, and maybe full 3D editor (tho it won't be DOOM anymore, more like Quake).

13:53 For these problems, I found the easiest fix is to "tophat" the portal plane. When the camera is within some close distance of the portal, expand the plane into an open-fronted cube. In other words, move the plane backwards along its normal (away from the camera) and add sides, a ceiling and a floor, all rendered as portals. This fairly easily solves the near-plane issues. even for quite large near-plane distances. I have a tonne of useful links in a Reddit post from a while ago. I'll include that in a reply here to try to avoid YT eating it.

Welcome to my badly explained bug fix! You made your portals pull the player through them to avoid certain camera issues (and I assume the infamous "Infinitely teleporting character" glitch). I would like to propose a solution to that. Rather than having the portal be a flat square, make it a box intersecting the wall. All sides of this box would render according to the geometry of the world by the exit portal. Once the player intersects the front quad and fully enters the portal, teleport them then. This would allow the player to freely stand in the seam of the portals, without any camera issues, and it would fix the teleport glitch. I am unsure how much of that you understood, and even if you did understand it, I'm not sure how much of it you'll be able to implement. Until next time, that was "Badly Explained Bug Fix"!

Excellent work, if that means anything coming from a random chatter on the internet. Your software renderer in particular is interesting to me, because the only significant advantage graphics processors seems to have is performance. Software renderers do not rely on the more frequently changing graphics processor architure and therefore are less likely to break in the future, they can make use of the advanced branch prediction of the central processor and are more logically flexible. Especially since it has been multiple decades since software rendering was common, I would have liked to see what game quality your crafty fingers could have squeezed out of the central processor. Good luck with your game nonetheless 🙂

Where did you learn how to code and also what age? Bro you're honestly my hero, you're AMAZING. What languages do you know and would you recommend any courses? Also, a suggestion is make a vid explaining how you learned how to code, you would gain a large % of subs after the vid would be released. Where did you learn how to code and also what age?

bro this is amazing

jdh: makes hot code reloading for C Also jdh: refuses to elaborate Also also jdh: Disappears for 3 months

I am relieved to know that this man is alive.

and jdh returns

finally, after so long, we're getting antichamber 2

Love the videos, one question though what os and window manager (if linux ) you use?

That is really cool

Gotta love the rewrite.

why didn't I get this in reccomended? the algorithm has it out for you , pal.

These portal setups are giving me some strong Antichamber vibes. Very cool.. These portal setups are giving me some strong Antichamber vibes. Very cool..

This is starting to look really similar to something I was working on about a year and a half ago. And it had procedural generation, too, though mostly boring with the occasional infinite tunnel. Ultimately I drove myself crazy trying to do shadow volumes across portals, and moved on to other stuff.

The single time I felt smart while watching this video is when you mentioned triangulation. This one i actually implemented in the uni

can't wait for the next video where you scrap opengl and use dx12

I WAS IN THE MIDDLE OF MY EXAMS AND I'M HERE

Weird question, but how do you get that off-colored gruvbox theme? It looks the same if I use vim in tmux without configuring the 256-colors! It would be cool to be able to use it by default xP

I laughed my ass off when you resurrected GLU. Love it

This is awesome.

This is bringing back PTSD from antichamber

Legendary comeback

Totally reminds me of Bisqit's video on his Doom style renderer with the slow motion render

Really well put together, nice work! Quick question though: The reason you don't have to deal with near-clipping in the software renderer is because the way the portal rendering is set up to only allow rendering of sectors/walls that are actually *beyond* the portal plane, in that the portal plane itself acts as a clipping plane, right? But in the 3-D rasterization pipeline, you hand over to the GPU the entire sector to be "portal'd"/"stencil'd" which includes geometries that are in between the camera's near plane and the portal plane.

The "banana gun" you made in Part 1 is actually the portal gun from, well, Portal! You thought back then we weren't going to notice, but I played Portal and so I know what the damn f**k it actually is.

there's been a lot of good portal "remakes" recently, from the N64 port, to this

you must be the most dedicated computer scientist in this platform