Wow, what happened? Two years after I stopped posting the youtube algorithm comes along and now this! :D I guess it's time to start making videos again! Thank you all for the kind comments! Since 2017, this channel has since been sort of an abandoned project of mine. I can't lie.... that really makes me want to make new content.

@ward7313

4 жыл бұрын

The video is extremely well made, you explained something really complicated in an easy and exhaustive way

@Goudron

4 жыл бұрын

Actually great video, good explanation and interesting topic I will wait for more

@uSaschka

4 жыл бұрын

Please make new content. I've discovered your channel half an hour ago and I can't stop watching your videos. There are explained so good.

@BodhiGeraci

4 жыл бұрын

Moet je echt doen!

@catprog

4 жыл бұрын

I think it was thanks to the yourtube algorithim

3:49 "What is distance?" *Vsauce music plays*

@daskampffredchen9242

4 жыл бұрын

Or does it? Mindfield Intro starts

@De50prala

4 жыл бұрын

Hey VSauce, Michael here

@noah321

4 жыл бұрын

Or is it? *vsauce music intensifies*

@daskampffredchen9242

4 жыл бұрын

@@De50prala Where are your fingers.*Pervert

@thesobolan7480

4 жыл бұрын

Wait what he hearted you 4 days ago

"Speedy thing goes in, speedy thing comes out."

@zombieslayer1468

4 жыл бұрын

I thought that might become a meme some day.

@user-mj1hn6ou7f

4 жыл бұрын

layman's terms

@arnox4554

4 жыл бұрын

Fun fact: The Unreal Engine 1 already had portals called WarpZones. Admittedly, they had to be made at map creation/editing and they wouldn't handle hitscan, but otherwise, yeah. This shit way back in 1999. Just another reason in a long ass list of reasons why Unreal Tournament is GOAT for the PC.

@rareskeletor5405

4 жыл бұрын

can't explain that

@Hoch134

4 жыл бұрын

I love how it's the same sound that "ADA" (the computer of the ship) in Outer World has. Good things don't disappear.

This is the tutorial I like to see because there is no code in it. It just explain the concept. This is very useful to auto check your method, and lets us thinking about code alone without been affected and atracted by what the guy in the video did in his code. Easy, great looking video !

@mikul9204

4 жыл бұрын

yeah, I wish all coding tutorials were like this because when I copy someone else's code maybe I'll understand it but there's no way I would be able to apply it to a different situation

@dies200

4 жыл бұрын

@@mikul9204 Dependes a lot on what you want to archive. If you are teaching a general concept (as you do here), yes. No code is better. But sometimes you want to teach how to do a certain thing in a certain language. Then it's better to explain the concepts and then walk through how to put that into code

@deoxal7947

4 жыл бұрын

Ya, but It would have been nice if he linked to the source code though. That way we can take a look at the core algorithm.

@rockomundo

4 жыл бұрын

I just don't like coding so this is the best type of video to explain what's happening.

@toxic_narcissist

4 жыл бұрын

I would like it to be a coding tutorial. Otherwise it's just useless

jeez, what a great video. never thought i could wrap my head around this, but you explained it perfectly. bravo!

@HellishPumpkin

3 жыл бұрын

Nick Robinson Sup Nick

@justsomebodyhere4930

3 жыл бұрын

This is the last place I thought I'd find you

@duckles426

3 жыл бұрын

So i flew to japan to find a portal.

@derpboxstudios

3 ай бұрын

I am now permanently attached to the reply chain

You sadly omitted recursive rendering, that is, stuff seen through portals seen through portals seen through portals seen through portals seen through ...

@OutOfNameIdeas2

4 жыл бұрын

Make portal layer invisible to the camera

@FoxSlyme

4 жыл бұрын

@@OutOfNameIdeas2 this is a dumb way

@Turtledud3

4 жыл бұрын

You have the portals camera look through and render the same image, but smaller, and overlay it in the middle of the first (at the scale). You also get a very slight intentional bend in the render, so eventually, it bends away and prevents indefinite looping at specific angles, which prevents the game from crashing due to infinite re-rendering of smaller portals. The angle you add to each render is directly comparable to how much rendering your system/engine can handle. For bad computer or engine, add more angle per render and have less portal renders. For better computer or engine, add less angle each time and therefore have a bigger "depth" by having more rendered portals. Try this sometime. Get two mirrors, preferably one on the wall and another small handheld mirror with an opaque backing. Try to see an infinite loop in the mirrors by facing them at each other. You will notice that no matter how hard you try, you can never see an infinite loop because the pattern in the mirror eventually bends off and prevents further patterns from being made. (Technically, if you had a 1-way see-through mirror and you looked directly through the back of the 1-way mirror at the wall mirror, then you could see an infinite loop, but we are coding the game to avoid this.) This principle of never seeing an infinite loop and only ever seeing so many at once is exactly how the game never crashes (in theory). Note I know nothing about the coding, but I do understand the logic behind it, so please correct me if I am wrong.

@shadamethyst1258

4 жыл бұрын

@@Turtledud3 Your idea is interesting, and it would work. However, I believe the effects of perspective would become broken (that is, the further an object is, the less there is a visual scale difference between its frontmost parts and its rearmost parts). I don't really know :)

@v.horvath3507

4 жыл бұрын

Oh yeah, stuff like this: kzread.info/dash/bejne/YoiOxptucqaxfbw.html Would be nice to have a nice demo with explanation for that

Portal was way ahead of its time, the portals really looked convincing^^

Apparently Valve dynamically altered the wall's collision geometry whenever a portal was placed.

@kaydencebernard7775

3 жыл бұрын

Hmm i dont know how to see geometry frames and shit with the command prompt in source so im gonna see if someone else has photo or video evidence

@randomcatdude

3 жыл бұрын

@@kaydencebernard7775 Pretty sure one of the CO-OP map developer commentaries has a commentary node that shows you how the geometry changes.

If you listen to the developpers commentary, you learn some other things they did with the portals. If you drop the cube like at 6:44, it takes a lot of stuff to make that work. I think they made a sort of gradient of the effect of both side's gravity...

This is crazy

@DigiDigger

7 жыл бұрын

...call me maybe?

@CubicalStudios

7 жыл бұрын

XD

@CubicalStudios

7 жыл бұрын

How did you solve the camera clipping through the wall? gyazo.com/435e1ce3f34e10c2bafecf7cd9ee13e7

@DigiDigger

7 жыл бұрын

If the camera is clipping through the wall before the player teleports to the other portal, you would either need to teleport the player a bit sooner, or change the clipping plane of the camera to be much closer to the player. Since you'll basically have your face pressed up against the wall, your camera has to have a really close near-clipping plane :)

Q: How were the Portals in Portal created. A: By the portal gun Q: Who created the portal guns. A: Aperture science

@SalemYbor

4 жыл бұрын

Q: Who created Aperture science. A: Cave Johnson.

@SteelRider

4 жыл бұрын

Q:who created Cave Johnson

@SteelRider

4 жыл бұрын

@Poralisium1337 humanity

@DeadGhost307

4 жыл бұрын

@@SalemYbor I was gonna do that

@DeadGhost307

4 жыл бұрын

@@SteelRider who created humanity

i also tried this many years ago but i came up with a different solution instead of rendering the other side of the portal to a texture, i would actually use a stencil buffer to keep track of what part of the frame was portal and what wasn't as well as which portal it was i would then use a translation matrix to modify the position of everything in the level, set a clipping plane so that nothing that was supposed to be behind the portal would be drawn, and then render the frame again but only in the spots where the stencil buffer indicated there was a portal the result was a perfectly seamless portal for the physics, i created a collision object to represent the portal it's self but made it so that if a collision was detected but that point of collision happened within the portal object then it would be treated as if it wasn't a collision at all and just to make things look nice i used another clipping plane when rendering objects going though portals just so they wouldn't stick out the back

@shumanbeans

4 жыл бұрын

I still don't understand the graphic part of making games (masks, shaders, redering, etc), hopefully, one day I will be able to come back to this comment and understand your solution.

@khmnc

4 жыл бұрын

@@shumanbeans well, if you have any specific questions, i might be able to answer them though if you're just starting, googling a tutorial might be beter

@khmnc

4 жыл бұрын

@Joe Duke what do you mean?

@TimBell87

4 жыл бұрын

Thanks, I spent the entire video wondering why you wouldn't just use this approach.

@khmnc

4 жыл бұрын

@Joe Duke ah, alright, no i've never used a 3rd party game engine so i 've no idea what they're like

Interesting, makes sense why there isn’t really any portal rip offs

@fss1704

4 жыл бұрын

yes there are

@emilbrandwyne5747

4 жыл бұрын

@Sébastien Levesque there is this portal shooter

@attinyit9609

4 жыл бұрын

I know that's not the point but there are some really good Portal2 mods.

@nandurstudio

4 жыл бұрын

try mari0

@borstenpinsel

4 жыл бұрын

Well, there is the predecessor of which portal is a RIP-off (game mechanic, not story). "Narbacular Drop". According to wikipedia, valve hired some of the devs of this game

The visual portion does not need to be anywhere near as complicated as proposed. Have the second camera point perpendicular to the plane (or tangent) of the portal and render with an off-center view frustum. This has the exact effect of "projecting" what you should be able to see through the portal onto a planar surface, skipping past all the perspective issues, distance issues, etc. It would also massively simplify recursive portals rendering. This will also be much better for performance as your view frustum will only need to be as big as the portal on your screen, so most of the time the majority of the scene would not even have to be rendered in the portal. We created this exact same effect many years ago in an intro computer graphics course, albeit in D3D11/OpenGL, but I'm sure Unity supports off-center view frustums as well. Edit: To make sure I wasn't just speaking out of my ass I just spent an hour replicating the visual effect in Unity. Can't get the camera to natively render off-axis but easily solved by supplying a custom perspective projection matrix. The above method works in Unity.

@Nohax8

4 жыл бұрын

can you make tutorial or upload project files please?

@Danuxsy

4 жыл бұрын

Can I get some of your brain?

@drewmileham202

4 жыл бұрын

Can you elaborate a bit more on this strategy?

@eclmist

4 жыл бұрын

If there is enough interest, I will record a tutorial when I find some time

@drewmileham202

4 жыл бұрын

Samuel Van Allen That would be great.

KZread is like, "Let's hold this good content for a couple of years for no reason"

@milkdromeda8539

4 жыл бұрын

And viewer be like, "let's watch this content which we dont want to just for the sake of getting like by comenting comment which there is already like a infinite of them"

You need Moonrocks to make them work properly

@ahmed4363

4 жыл бұрын

NOBODY'S GOING TO SPACE MATE

@Brahvim

2 жыл бұрын

No FBI, No.

"teleport from portal 1 to portal 2" i didnt know this video also covered the basics of time travel

KZread is like "Hey this dude didn't upload in 2 years?! Lets give him some love" KZreadrs Daily uploading: 👀

@daetheknight.

4 жыл бұрын

lol hey look its Smashen!! are you planning to upload portal or splitgate arena warfare to your channel now?? >.>

@smashenYT

4 жыл бұрын

@@daetheknight. You know me from somewhere? Currently I am a DBD youtuber. I once had Portal lets plays on my channel a long time ago 😆 Not sure how people react if I suddenly upload other games

@daetheknight.

4 жыл бұрын

@@smashenYT lol I watch your dbd videos all the time. Even join your stream when I can catch it. You can do a test video and see how people respond to it. Plenty of other toobers try it. And if it works then you have more things you can do. If it doesn't then you can go back to dbd

@smashenYT

4 жыл бұрын

@@daetheknight. yea your name seemed familiar. KZread recommends this to everyone I guess 😆 You want that in English on my main channel?

@daetheknight.

4 жыл бұрын

@@smashenYT si, creo que el lenguaje seria perfecto

Ahhh, this explanation is sooo good! I love how you go back and forth between problem and solution, building up to the final implementation bit by bit in a logicl manner. 10/10 presentation!

This is such an underrated video O:

"It's not as easy as you might think" I was blown away when I first saw it. I think it must be one of the toughest things to program. Honestly, the explanation you gave is actually much easier than what I thought!

@sly1024

3 жыл бұрын

If you ever programmed a 3D camera position matrix, it's actually pretty straightforward. The portal basically transports light rays, so we can either move the whole scene to be where the portal shows or move the camera. This is the same how mirror/water reflections work, just flip the camera to the other side, render it to a texture and map it to the reflective surface.

Couldn't have asked for a better explanation. Thank you so much for making this

Thank you VERY much for getting straight the duck into it without 5 to 15 minutes of exposition and then explained every bit clearly and concisely man. You don’t know how much I appreciate that.

What a video. I haven't seen such great video simple, elegant, ample, and funny - in years. Short but highly effective. Bravo.

Me listening to the ending: O ok DigiDigger: And that cover the basics of portals! Me: *Basics.....* Edit: just a joke i understood this entire vid and pracically already knew most of it the only thing hard for me is coding and stuff like that

@CabbageGod

4 жыл бұрын

I guess it's basic to actual game devs. It seemed very simple and straightforward the way he broke it down. But I realize now that that's definitely because I have background in this, Unity in particular. So the basics of portals.. if you know a bit about game development.

@hannahnelson4569

4 жыл бұрын

i think this would count as the basics, though functional it lacks some important mechanics that i recall were implemented in the games, namely the conservation of diagonal velocity to the portal utilized in portal 2 along with the infinite mirrors effect you can get by placing two portals across from each other

@OrchidAlloy

4 жыл бұрын

Yeah this is just the basics

@ThePhoenix107

4 жыл бұрын

@@CabbageGod I can confirm that. I created a portal effect myself a while ago and when you have done that you will know that this was just the basics. Implementing it had a bit more to it than these basics. For example, you will also have to use oblique frustum for each camera to make it look right. This means that you set a plane in 3D space where one side of this plane will not be rendered by the camera. This is necessary to clip everything behind the wall the portal is sitting on. For example, imagine a thin wall with a portal on it. Behind the wall, there is a box. Without oblique frustum, the box will get rendered when the camera is behind it and this will look odd when looking through the portal. With it on, the box will not be rendered. There are a lot of other details, like raycasting (shooting an invisible line to detect an object; used for example for picking up boxes in Portal) through portals, keeping the box in front of you while it is on the other side of the portal, physically at a completely different position, etc.

@li_tsz_fung

4 жыл бұрын

@@CabbageGod The camera part would kill me. The physics part is not straight forward, but that should be fine. I might figure it out in few days if I didn't give up

Why would youtube reccomend this to me in 2019 and the channel is dead 😭

@hubjump

4 жыл бұрын

Maybe he'll come back and see his channel booming?

@daetheknight.

4 жыл бұрын

youtube has been doing this nonsense a lot lately..

@cmanatlan

4 жыл бұрын

​@@cembaturkemikkiran4109 Check out the channel mix and jam, it does the same kind of thing showcased in this video but the channel is active

@cmanatlan

4 жыл бұрын

Check out the channel mix and jam, it does the same kind of thing showcased in this video but the channel is active

@cmanatlan

4 жыл бұрын

@@hubjump Check out the channel mix and jam, it does the same kind of thing showcased in this video but the channel is active

This was a brilliant step-by-step tutorial. Seriously I wasn't expecting something this good, but...wow. Thank you!

I’ve always been curious, loved the way you incrementally worked through the process, thank you for this great video

He said in the video that in order to retain an entity's velocity when going through portals, you need to transfer the velocity information when you enter the portal, to when you exit the portal, so that your velocity isn't just set to 0, and the angle of exit should just be in the same direction that the portal is facing. This is wrong. Sometimes when you enter a portal, you enter it at an angle, say, I run through a portal that is diagonally facing toward the ceiling, I would exit the portal with the same velocity that I entered it in, *and* I would exit it at an upward angle, relative to how I entered the first portal.

Nicely explained! I did some portal experiments in UE4 a while back and it's pretty much the same implementation I vaguely remember reading from one of Valve's presentations that they do all the rendering in one pass by setting the view/projecting matrices for the masked area of the portal so they don't use a secondary camera in the same way. It's been a while, so the details are blurry to me. That would save a bunch on performance, but is a lot more involved in getting to work proper. Are you Dutch by any chance? *subbed*

I'm seeing this video now but I have been wondering about this question for YEARS. I always wanted to do some research and find out but this video does an incredible job at explaining everything. You explained every part of the question and made it strangely easy to understand

Just found your channel from KZread home page from your Terraria video. I already love this series. Looking forward to seeing more.

KZread is really broken for not suggesting this video to me 2 years ago.

Amazing! One more thing I thought of is that you can set the near clipping plane of the camera to the distance between the camera and the portal so that you don’t see objects behind the exit portal.

@leonardoraele

4 жыл бұрын

That's actually very important.

Such a great explanation. This format you've come up with for explaining this is really good. I actually feel like I've learned a thing or two about game engines in such a short time.

Radio music at end: (Happy sounds) Captions: [Laughter]

i came here expecting it to be about how the actual game did it, sort of a boundary break style thing. But i think, you figuring it out yourself, outside the game, turned out even better.

KZread employee: How about we recommend this video to everyone That guy boss: Y E S

I'm really glad the YT algorithm showed me your videos, sad I missed them when they were coming out, hope to see more from you!

Great video! I hope this will become an ongoing series. I love seeing how games are programmed.

Awesome video! Perfectly explained. I always wondered how portals worked and now I'm glad to understand it, you just got subscriber++ ;)

digidigger: so here's portals none: youtube algoritm: i will teleport you back to the year 2017. and bring this joke as well.

That was one of the best videos explaining game codes that i have ever seen, i always wonder me how portals in portal were created.

This video just showed up on my recommendations and it is absolutely awesome! I have no experience in 3D but I absolutely understood every bit of your video. Kudos!

I did not expect such a great video, why was this recomended to me now ??

Many Garry's Mod implementations of the portal gun use this method, including Bobblehead's Portal Gun and Dr Matt's TARDIS Rewrite

@randomcatdude

3 жыл бұрын

Yup. Though unfortunately, the visual side is buggy as hell due to GMod's limitations, and the physics is wonky as hell too.

@MysteryPancake

3 жыл бұрын

@@randomcatdude ye, i imagine it's tricky without rebuilding the source engine

This was very informative and fun to watch. As you were explaining each part my brain was running through what this would look like in code.

Wow this was such a fascinating watch! Thanks for the time and posting (although it was a couple of years ago) - you've gotta love KZread!

Brilliant! How do you even have only 190 followers? :O

@DigiDigger

7 жыл бұрын

I haven't really gotten much exposure yet. I try to just keep making videos and hopefully we'll gain some subs some day :) Can I ask: how did you come across my channel?

@TheMemoman

7 жыл бұрын

I'm not the guy, I'm another guy, and I'm not 100% sure how I got here, but I can trace it back probabilistically. I'm gonna say that probably you were listed along some other lesser known game development channels in some reddit r/gamedev post about "good game analysis channels", to which I'll venture to say that a disclaimer was probably added about how your channel "is not updated often but the videos are great practical in depth stuff" to which I would have agreed after browsing the backlog. I probably subscribed after checking out this along a few other channels on the list and I remained subscribed with the hopes of sometime getting one of the cool videos produced here, such as this one. That's enough with hypothetical remembrances. This video was indeed very cool. I appreciate your practical quest and analytical process walkthrough. I thought it was thorough, thought provoking, motivating and engaging. Keep at it!

@vladimir_ckau

7 жыл бұрын

You sure will! Keep up good work! I think I was looking for Hotline Miami analysis. That brought me here, I like what I see, so I sub.

@kipchickensout

5 жыл бұрын

Владимир Остапенко 698 now, vladimir :D

@xayer98

5 жыл бұрын

You showed up in related vids for me, but I'm actually the head of social media at a Toyota dealership and I 'd love to lend you my marketing and branding skills to help you get exposure. I was so shocked to see you had under 1,000 subs, but from the sound of this guys comment you've already come a long way in a year. I don't wanna get paid or anything. I really just enjoy your content and want to help it reach more people. I hope to hear back from you (:

I literally had this exact question in my mind yesterday

AMAZING!!! Just found your channel and I'm loving it!

This is surprisingly complicated and I never thought about it until now, That’s amazing! Great video!

Obligatory "Now you are thinking with portals"

"...it's a CHEAP TRICK, but as far as I can see IT JUST WORKS..."

@xeome5596

4 жыл бұрын

thats how programming works lol

@BanditLeader

4 жыл бұрын

Is that a motherfucking jojo reference

This is so well made! I hope part 2 comes around soon

That part where you resize the camera's view and the portal effect finally looks perfect made me audibly go "oh shit" out of how beautifully simple it ended up being. Fantastic video.

Me: *trying to sleep* My brain at 2 am:

@thepixelkings3491

4 жыл бұрын

*S P E E D Y T H I N G G O I N S P E E D Y T H I N G G O O U T*

@karlbischof2807

4 жыл бұрын

@@thepixelkings3491 lmao i was a bout to reply this

@NoxFly

4 жыл бұрын

SandeMC exactly same xd

I'm still confused on the final fix to the portal implementation at 4:15. How does stretching what the camera fix our distance issue?

@Pluvillion

4 жыл бұрын

Asking the same thing. Is the image stretched or is it positioned to make it seem like we're looking through a hole? What does the whole portal look like if it was the whole wall? How is it supposed to look like if we were to look at it in a different angle (assuming the viewpoint is still connected to the player's camera than the second one)? I got all the things listed here expect for the distance part. I honestly can't wrap around my head around it.

@GEB_Rosee_PPS

4 жыл бұрын

its stretched out. Its like changing FOV in a game.

@BingusGaming-bq1zv

4 жыл бұрын

Just imagine putting a camera six steps away from portal, 3 steps ahead of the 9 steps portal, because you are looking from nine steps the resolution is for example 1600 x 800, because field of view increases with distance, so now you just crop the displayed resolution to the correct resolution to maybe 1200 x 800 and display it on the exact same mirror size as the portal enlarging the object and making it look closer, all the while calculating the correct setps

@darkhoodchief

3 жыл бұрын

I don't if this is the right explanation but: The image on the portals comes from the image gathered by the portal camera. The camera gathers image in a ratio that is similar to display (most likely 16:9) which is longer horizontally. But if we try to project that in a portal which is longer vertically (likely 1:2), the image produced would be squeezed in the horizontal axis. In order to counter the squeezing of the image in the horizontal axis, we just stretch the image horizontally before projecting it in the portal plane. Also as he mentioned, we don't need all the information that cannot be seen through the other side so we just discard it and scale it up so the portal only projects what the player must see. Hope this helps, although I don't know if this is the exact thing that he is mentioning in the video.

Till today, I thought that it would have been really easy to make the game portals. You really showed by the effort that had to be done in the game, and that was 13 years back.

Like most folks, no idea why this appeared in my recommended but what a FANTASTIC video, thank you!

I think they have some more detail on how they created them when you turn on the directors commentary :)

Absolutely breathtaking, ive tried to do this once long ago and ended up doing minecrafts teleportation with ender stuff

Wow, this was really interesting and well explained! Awesome to see the thoughtprocess behind these games!

Awesome video! These are informative and fun and cool watching someone figure out a problem!

3:45 "Who wants $60?"

I always thought there was another room rendered behind the portals, with the exact properties of the original room. It would kind of fix every problem with the camera and the teleport timing.

@AquaDoesStuff_

4 жыл бұрын

but that would also cause issues with room overlap, where if the duplicate was on top of another room it would break.

@dethswurl117

4 жыл бұрын

That's a good idea but it would pretty much then double the gpu the game needs to run which is no fun

Yes! I'm so glad this wasn't an abandoned account! Please keep doing these type of videos, they are awesome.

That was more complicated that I thought it'd be, thanks for explaining it all.

It just puzzles me how somebody has implemented portals into Minecraft :0

@snoookie456

4 жыл бұрын

what puzzles me is how they manage to implement them in Darksiders

@SodAlmighty

4 жыл бұрын

Darksiders was awesome. It had pretty much any game mechanic you could imagine in there.

You forgot to talk about player rotations (let's say u jump in-ground and another portal in a wall.) P.S. I literally made a copy of portal 1 in unity before see nur video. And everything made same way BUT I didn't have portal collider as u did. This is a good solution. (I trigger physics. ignores collisions when enters the portal but I didn't think of adding collider on the portal itself. Heh)

makes me appreciate the game even more. thanks

Fascinating; super high quality demonstration too. You've earned yourself a sub

I heard valve used their room system to spawn copies of rooms on the other side of each portal

@snoookie456

4 жыл бұрын

yeah, that is why test chambers are separated in both games

Can we see the source code of the portals you've made? :D

Ending it with the radio tune was perfect.

I'm very happy that this video got recommended to me (by KZread). It's quite sad that some videos never get the attention they deserve, but very nice to see that there are some exceptions. Very well made video!

I was actually looking for something like this and was just recommended it while looking at memes. What luck

I feel like an aperture science intern now

I appreciate your way of explanation. Showing series of failures gave me good insights and better understanding. Thanks for the quality video!

I demand more content from this amazing channel!!!

Could you give a more in depth tutorial? Code wise, it would be so great!

Could you elaborate more on how you went about using the two cubes to create the illusion of one single cube?

@thewowo

5 жыл бұрын

create another cube at position: offset + pos = (current portal - position) + other portal. And something similar to rotation. then when exit destroy that clone.

@MMedic23

4 жыл бұрын

@@thewowo Yeah but how do you set collision?

@thewowo

4 жыл бұрын

@@MMedic23 well, thats more complicated; make invisible walls around the portal and make that the things in the portal only collide with that walls.

@thewowo

4 жыл бұрын

@@MMedic23 or disable the clone's collider an rigidbody

Portal always fascinated me. I always wondered how this works though I was aware that they must use two "cameras". It all seems so easy but I bet there is so much complexity behind this game.

Amazing video. Me being a huge fan of Portal and having this question wandering around in my head for years, to finally see someone explain it in-depth is cheerful. What I would've of loved is a code representation of all the points taken in this video about portals in-game. Btw, so little subs with such intelligence? Oh well, might as well help out.

_I'm not even angry, any-more_ although you broke my heart and kill me. I'm still alive !

Will there be any code-type tutorial for this portal concept? Cheers

This was fascinating! Excellent video :D

You must be a talented coder to recreate this and explain it so well. Please do more complex game mechanics from a code standpoint!

"just make a portal" what can be hard here?! - 2 cameras, nothing else - that's how it looks like from non-programmer boys (c)

I was so worried this was going to be a video of some nerd trying to come up with weird theoretical physics to explain real life portals, but it was the _real_ how portals are created

I never thought further than putting a camera on the other side positioned at the portal. congrats to the people at portal for figuring this out!

Would love to see new concepts next like floating islands and destructible terrain xD glad the KZread algorithm found me a new subscription :D

Maybe I missed something during the explanation, maybe it's due to me reading this at 6AM, maybe it's both, but does this portal rendering method solve the frustum culling issue trying to achieve this in UE4? Say there's a large cube 3 feet BEHIND the exit portal, and you are standing 4 feet in FRONT of the entrance portal. Assuming the cube is large enough it will obstruct part or all of the camera's view in the portal, breaking the illusion. The obvious solution to this is to somehow change the near clipping plane to the distance between you and the entrance portal, and as far as I can tell, that doesn't seem to be possible in real-time in UE4 (to my knowledge).

@Schytheron

6 жыл бұрын

I also made some portals in UE4 and I have the exact same issue. Did you solve it?

@spaceowl5957

5 жыл бұрын

I haven't really thought about this and I've never done any game programming, but couldn't you make it so rendering "rays" can only hit stuff after they've passed through the portal or something?

Ok so this is really cool but I think your approach isn't the same as valve's; I once used p2's level editor to bug out a portal and the game started to not render some of the walls, revealing the effect: they seemed to just place/render an entire copy of the room behind the portal

@KaNofbeans

4 жыл бұрын

That is probably just the skybox or the hall of mirrors effect, you cant just instantly place entire rooms easily like that in the source engine.

@sharp14x

4 жыл бұрын

You just saw the nodraw.

@Starwort

4 жыл бұрын

@@KaNofbeans could be, just saying what it looked like lol

@Starwort

4 жыл бұрын

@@sharp14x definitely not nodraw, no nodraw effects and there was nothing behind the wall in question the same shape as the room being shown (bear in mind this was a rectangular puzzle editor room)

@clonkex

4 жыл бұрын

@@Starwort I would guess this is a result of the stencil-buffer rendering. I'm no expert, but perhaps if the wall around the portal vanished it might not stencil out a proper portal shape and would just render the entire room. If they just placed an entire copy of the room behind the portal, you'd be able to place a portal at the edge of a wall and see the copy of the room appear behind that wall.

As a game designer undergraduate, i find this really helpful subbed

This is amazing! Thank you for explaining.

Kids be like : Oh that’s how you make one News : a kid made portal 3

1 problem: If you move the camera back like that, what if there is an object in front of the portal camera? That is gonna look weird

@Asjagadra

4 жыл бұрын

Maybe you can simply adjust the render distance in order to render only from the portal. That way, objects between the camera and the portal won't be rendered

@X606

4 жыл бұрын

@@Asjagadra yeah that kind of works, but at some angles it doesnt

Great video, logical and interesting. Yes this just randomly showed up on my homepage today without searching lol and I'm glad it did! Make videos again!!!

I love casestudies like this that show the ugly but genuine reality of trial and error. Good work!