Introducing RayCastWorld

[@todoz11]

you single-handedly got me interested in the more technical, "mathy" aspects of programming. i genuinely thought it was something i wouldn't be able to grasp or learn but your videos made it so much more accessible - thank you sir :).

[@javidx9]

Thats cool Thomas, I hope you continue learning!

[@ykyjohn]

indeed, thank you very much

[@bethesdacam]

This!

[@Fergobirck]

You have an incredible gift for tutoring. I've started following you when you had 6k subs and it's great to see how the channel has grown. You deserve it!

[@javidx9]

Hey thanks Fernando, its very humbling (or disturbing?) that people are interested in what I babble on about XD. Thanks for your support though buddy!

[@jacq0272]

Your tutorials are always really helpful for understanding these concepts. I cannot wait to dive into this one!

[@javidx9]

Well thanks Jacq0, this video is more of an application example rather than the theory behind it, but I hope its informative!

[@jacq0272]

@@javidx9 No bother at all, my comment is poorly phrased. Even if its just an application and explanation, it can still be valuable in understanding, especially since the source is available. Like a demonstration of sorts!

[@ManMadeOfGold]

I was just rewatching a lot of your old vids until a few minutes ago, guess I'm not done yet!

[@javidx9]

lol, there's quite a few now :D

[@TopShelfization]

reinventing the wheel, simply because you can.

[@monopoly2170]

"This is all technology I've covered in two previous videos" And I wouldn't mind a thousand more

[@Godmcgod]

You sir are the Bob Ross of programming. Never stop!

[@whoshotdk]

I just implemented sprites in my raycaster based on the code from this. On line 584+, you calculate the screen position of the sprite. It sits inside a double "for" loop. If you were to define the position variable before the loop, you'd be able to check the Y position is in screen bounds during the Y loop, outside the X loop. If it's out of bounds, simply "continue" the loop, bypassing the X loop entirely. Probably considered a micro-optimization but it really helped speed things up in my C# implementation!

[@doscassette871]

Absolutely fantastic. I've been looking for an engine like this to build a retro ARPG and had been messing around with building my own but this saves a ton of time. Absolute legend

[@zerdagdir1988]

Bisqwit tackled this subject to an extreme level

[@iProgramInCpp]

I have not seen one single raytracer video on his KZbin channel. The only things I've seen are proper 3D software renderers

[@r1pfake521]

Watching Bisqwit is nice and entertaining, but I don't really learn much from them, because most of the time he just shows the code and doesn't really explain that much. To be honest Im not even sure if he considers his videos as tutorials or if he just wants to show cool stuff.

[@zerdagdir1988]

@@zohichnazirro8640 +1

[@zerdagdir1988]

@@r1pfake521 javid knows how to teach, I wouldn't be surprised if he was a teacher

[@Roanokekidstech]

iProgramInCpp he has a video called “Creating a doom style 3D shooter in C” I’m not entirely sure but I feel like that was a raycast engine? Correct me if I am wrong. It just seems like he added some more advanced features.

[@BudgiePanic]

This channel is really something special, I've studied computer science at university for one year so far, and its fascinating to see so much that I learned about last year, pop up here. Looking forward to this upcoming networking stuff.

[@Roanokekidstech]

I made a little ray casting demo in your game engine before and posted it on the discord. It was a fun process, and makes you think a different way. I can’t wait to check out this code.

[@yosipshepard3065]

You are breathtaking!) I'm just trying create my own udp server/client for fps, by using winsock, and there's your videos about networking is comings.)

[@boris3320]

As always, explanations are very clear. I may have already told you that thanks to your videos & olcGe I came back to programming after a loooong break :) It has become fun again ! Thank you.

[@onesketchyguy6050]

I love/hate how much you trivialized something I fought with for over a week. You're my hero

[@3DSage]

This is great! Did you see my recent raycaster Game Boy Advance Demo!? I think you would like it. I made it run on the actual Game Boy Advance.

[@wowLinh]

A-MA-ZING. Fantastic video as usual. Big thumbs up!

[@spjewkes]

Another great video, David. It really shows off the power of the pixel game engine and what can be achieved with extensions. I really must dust off my old ray casting engine that I wrote (which was inspired by your earlier videos)!

[@cheaterman49]

I hope you will in the future make a video (or a series) about some of the internals, possibly the physics system or something? :-) great video and great extension!

[@AJSquirrel53]

Laughing so much at the creepy archers moving around. This is probably one of your finest creations!

[@kettlestew]

Can't wait for your take on BSP

[@ChupoCro]

Extraordinary presentation!

[@stephenelliott7071]

Ah, I know your time is limited this year, but always good to get a Javid video - and a Ray Casting one at that. A subject I find interesting, it's 3D but not really. A quirky anomaly.

[@javidx9]

Thanks Stephen! I find pseudo-3d really interesting, its like magic :D

[@stephenelliott7071]

I completely agree.

[@diarmaidmac2149]

10 seconds in...my God, you are an amazing programmer!

[@gasparRaduB]

I was wondering how long it would take you to get to this point. People have been asking about the server side implementation of a MMO since you summited your entry for the game jam. I have to say, you moved quite fast and the code is very clear, as always. Nicely done. It's amazing you find the time for such things.

[@cheaterman49]

37:23 Hahaha, the delivery was fantastic :-)

[@jsflood]

One word: Awesome! Thank you! :-D

[@FrostGamingHype]

Me:making an graphics engine without any tours from scratch in c++ my family: javid:maks an game engine similarly my family:🤯🤯

[@motbus3]

Best programming channel ever. And I'm subscribed to all of them. Any possibility of gpu programming? Like a simulation with rendering?

[@javidx9]

Thanks motbus - the answer is maybe, the problem is doing something which the viewers can also do for themselves. Hardware 3D is certainly in the pipeline, just need to construct a vehicle that makes entertaining videos.

[@motbus3]

@@javidx9 great to know! Entertaining certainly your videos are! And I only can imagine how hard is to come up with this ideas! By gpu programming I also was thinking on gpgpu, like accelerating that mandelbrot set with SIMD. I haven't found yet a video good enough how to processing in gpu and then rendering in a decent way. If I find or do something useful I will share with you. Thanks for the great work Mr Barr

[@ykyjohn]

resembles minecraft too Should be a skybox feature!

[@joshinils]

I’d quite like to see more on multithreading. I just got a new cpu with 8 cores (ie 16 hyperthreaded cores) which I’d like to use. Same with my gpu, but that would be an openbl tutorial, right?

[@tezza48]

Lets get Fish in here adding some more light bounces and PBR materials.

[@nacnud_]

Fun and games fella. Cheers.

[@andrew_lim]

Your olc::rcw::Engine::Render() function is elegant. However I'm having trouble visualizing how you texture mapped the floor tiles using Mode 7. If you have time in your next video could you elaborate on it? Thanks.

[@GTGTRIK]

Ah yes, a static collision resolution I can yoink for my raycast engine implementation! (I got stuck trying to figure out by how much to move the object back on collisions with tiles)

[@brianmac8260]

brilliant javid!

[@Eviatarm]

Great video as always! I have a few ideas that can maybe catch your interest to make a video about :) I saw your circle collisions video, and was thinking how could you do the same thing but with rectangles, meaning calculating angular momentum, for the rotation. And was thinking about a sudoku generator and solver.

[@javidx9]

Thanks Cain, Collisions with rotating polygons is highly non-trivial. It's really interesting stuff though, but in isolation quite difficult to make a single video for - it may need to be series.

[@Eviatarm]

@@javidx9 also there aren't many resources online about it. It's either buying a book that was originally designed for 3D physics simulations / video games. or start learning classical mechanics. I encountered a single article about it online by randygaul ( maybe you know it ) that explained it well but still hard to grasp. I would definitely look for a series if it's ever going to come :)

[@a123-e6r]

Hey Javid! Your videos are the best! I have a question though, I seem to have a problem when I try to texture the walls with sprites. It gives me an error message on the olcPixelGameEngine header file. It says, "Exception thrown: read access violation. THIS was nullptr." What do I do? Thanks!

[@avocadopeel7536]

this is probably perfect for a wolfenstein clone

[@GiboonCloudSmoker]

brilliant

[@0ia]

This is really nice.

[@lbproductions6215]

Very cool!

[@boyemarc-antoine7027]

can u do a raytracing tuto pls :D and very thx for all ur works u helped me and my teammates a lot in our school with 3d code like rasterizer and raycast :) thx a lot and keep it up man

[@javidx9]

This is a very popular request, I probably will next year - this year is booked up with projects! :D

[@boyemarc-antoine7027]

@@javidx9 strenght ! and thx for the queek answer

[@Ryan-rn3sq]

@@javidx9 You're making a networking video soon aren't you?

[@RogueShadowTCN]

Cool video bro!

[@javidx9]

lol, cheers bro! :D

[@Jkauppa]

one simple ray tracing (casting) engine, using ready tech, would be use normal raster to get the first z-map, then 360 degrees fish eye raster from each pixel, up to chosen bounces or a light source that consumes the inverse ray, should be done with any accelerated rasterization engine like opengl or directx

[@Jkauppa]

assume the rasterization of each pixel is fast, because only z-map is generated, no lighting in itself, until the final "tree" is formed, from eye to a terminal light source

[@Jkauppa]

if you want it to be hyper efficient, you can draw each model multiple times, for every new camera source pixel, for example using geometry shaders

[@cheaterman49]

32:15 YOU drew this? So the tablet isn't just for scribbling visual explanations on Note! Whoa, that's honestly impressive and looks like a lot of work!

[@MichaelRichardson-bw5xh]

"It doesn't care...it doesn't care...it doesn't care" - He makes the honey badger of game engines.

[@PauloConstantino167]

Love your work!

[@tile-maker4962]

Cool, the beginning of the LSD simulator.

[@linuxnoodle8682]

Nice!

[@tedeusz83]

Next step? Make the textured floor.. :) thats a bit challenging because depending On the approach it can hit the performance even on fast machines

[@javidx9]

Take a look at first few minutes of this video again!

[@peter881]

Realy intrested on how to use the gpu amd and nvdie in cpp would love to see a video on it

[@DFPercush]

There are a few options for general purpose computing on the gpu - CUDA is Nvidia specific, there's also OpenCL, but if you're working on a game or using the gpu for actual graphics on screen, you probably want to look at OpenGL compute shaders and GLSL (openGL Shading Language). You basically send a buffer of input data to the gpu, give OpenGL a bunch of pointers to define your variables and types in your structure and how many elements there are, call the shader, and read back the output buffer. Or you could pass that buffer directly to another shader. You could use Vulkan or DirectX too, either would be faster than OpenGL, but most indie developers don't really need that much power, Vulkan is terribly complicated, and DirectX is not cross platform. Hope that gives you something to search for at least. GL ;)

[@bkucenski]

kzbin.info/www/bejne/laOToouin8yFb7M

[@matthewexline6589]

At 15:25 why did we choose such a bizarre field of view? Was that just to make a point that we could put any sort of crazy number we want in there?

[@GamerSaga]

thanks for making this! am curious would you be willing to tutorial making multi levels and stairs with this as well or know of any good sources that teach that?

[@cheaterman49]

SelectSceneryPixel feels a bit like a software-driven fragment shader? It's pretty cool :-)

[@undefined_cat]

Cool

[@wjrasmussen666]

Amazing as usual. Is there any chance that in the future we will get the ability to make a 3d world? So you could walk over/under other areas that you can walk on? So you could build multilayered homes, towns, dungeons, worlds, etc.

[@javidx9]

All I'll say is possibly.... ;)

[@jktech2117]

its not a bad idea, it is possible since there is rayca raycasting engine... it is still in dev... but it got pretty nice 3d fetures, i cant wait to the release of rayca

[@Xilefian]

Mistake at 0:26 Doom is not a ray-caster

[@badjumpcuts6599]

What is it then?

[@Xilefian]

@@badjumpcuts6599 Doom style renderer. It projects the 2D vertices of each wall into 1D space + depth and uses their "height" and camera "height" combined with distance to stretch them on the screen. The walls are rendered near to far by crawling the BSP tree and clipping the lines against each other. Doom has more in common with modern raster graphics than it does with ray-casters.

[@elimgarak3597]

Correct, it uses binary space partition, not raycasting

[@CcanCcaglar]

Hey Javid I really like your teaching style and your ideas! I wanted to ask- what uni course or MOOCs would you recommend that cover what you demonstrate in depth? How did you learn?

[@javidx9]

Thanks, I would recommend any engineering course that has a solid maths/physics combination. The programming side of it is the "easy" part, assembling your ideas into something tangible requires understanding/logic/planning and maths/physics subjects such as linear algebra, trigonometry, calculus, geometry, kinematics etc can prepare your mind in such a way to reduce a problem down into component parts, which can then be built back up into code. There are of course specific game development courses, but Ive no experience of them, and Im told by academic colleagues that they are not particularly wide reaching.

[@CcanCcaglar]

@@javidx9 . Thanks for taking the time to answer this question, it really means a lot for my career trajectory. See you and the 'gang' on the discord sometime!

[@Z_Z.t]

Why I have feeling, that this will turn out into powerful retro engine?

[@javidx9]

It could be a useful tool once it stabilizes a little. I think it has potential for porting, since it relies on very little other than a 2D vector type.

[@GregoryTheGr8ster]

Evidently, people really love "PS1-Styled graphics", especially for indie horror games. That's the nice feature about retro: it never gets old, because it already is old.

[@Z_Z.t]

@@GregoryTheGr8ster oldschool shooters and quests are also in this category

[@lucaxtal]

Great Work!!! I Love how you implemented the RayCast and how flexible now is!!! Just a question, about this rows: // Calculate distance object is away from camera float fDistanceToObject = vObject.mag(); Shouldn't we subtract also the fRadius from the object vObject ? Sometimes it happens to me that the object diappears when it is near the wall. I thought this would be this: float fDistanceToObject = vObject.mag() - object->fRadius; I hope I understood well, if not, I'm sorry.

[@jamdonut]

Im thinking of building a raycasted world and got a few ideas in mind of what I want to do... But I am wondering, do you know if jumping is possible with the same techniques in the video? Thanks!

[@srglmr]

You channel is very helpful , thank you for that I have a question i don’t where to look for its answer , Where can i find the algorithms for audio format, to and from mp3 , i want to use it in C, i want to algorithm it self not libraries , so i can use it anywhere in any programing language

[@javidx9]

Thanks, the place to start for mp3 would be the mp3 official specification, which is a long and complex document that will define all you need to know to encode and decode mp3 files. Playing them back is platform specific as youll need to access the sound drivers of the OS you are targetting.

[@srglmr]

javidx9 thank you, where can i find the mp3 official specification ? In Wikipedia? Or it has its own site ?

[@iProgramInCpp]

Hello, Javid!

[@javidx9]

Hello!

[@DeathAtYourDoorStep]

how did you make the different floors and inside/outside areas like in the beginning of the video. why didn’t you share how you did that too? :(

[@javidx9]

I did! It's no different to the walls! As the ray propagates, it will ask for samples which you supply, and it tells you which side of the cube it is sampling. If it's the top, return a sky colour, the bottom, some floor colour.

[@hey2956]

Hello. What is your favourite programming language?

[@javidx9]

C++

[@antonioambrosio2064]

Someone can link me the video where you speak about the raycast world tecnlogy??

[@lysergik7476]

@javidx9 Hi, I maybe ask a stupid question but how do you define the sprites offset ? I don't understand how you picked up your values. I got a sprite sheet that is 519 x 454, so each sprites got the same height as yours(64 pixel) however I tired to display the first sprite on the top left of the sheet, so I entered 0.0f as a first value and 64 as the second value but didn't got anything. I tried with other values quite randomly and never got any sprite of the sheet displayed by the program or even part of them. So how should I determined the values for the offset ?

[@lysergik7476]

Dont mind my question I just solved it ! It was 0;0f and 0;0f because it's the first sprites on the sheet ^^ I just had to read the definintion of offset online.

[@cheaterman49]

39:07 Well! I suppose if you sampled the texture appropriately on each wall you'd in fact get something akin to screen space reflections? :-)

[@abdelrahmaneissa1463]

Wow

[@nolan412]

Doors & floor / ceiling portals

[@visonred]

i finished adding the enemy aka the archer when ever i see it my fps goes down to 10 fps how can i fix this?

[@duality4y]

did you know that you are awesome?

[@beyondcatastrophe_]

I find it a bit strange to have the engine handle the objects, shouldn't the objects handle themselves? In my opinion it would have been better to have to make a new object-derived class for every object and have that handle sprites, collision, etc (passing the engine as an argument). To me this seems to take more advantage of object-oriented programming and would remove the need for the large amount of switch/case statements. Is there a reason why you decided to have it as-is?

[@javidx9]

Exactly why you have the choice! Derive from the Object class, disable the physics. Personally I'd rather have a "large" number (4 or 5) switch cases than 4 or 5 similar files of objects.

[@beyondcatastrophe_]

@@javidx9 Ah, so your engine also asks the objects? Should've looked at the source... Thanks!

[@darkengine5931]

​@@beyondcatastrophe_ In my experience, and your mileage may vary, your codebase will generally be so much easier to maintain (especially against new and unanticipated design requirements) if you decouple your game logic from engine-specific concepts like sprites, audio, and physics. For example, take the D&D rulebook. It mentions everything related to the fundamental game rules: the data that all creatures have in common, the damage and other data fields of every single weapon, consumable, saving rolls, THAC0, spell effects, everything. Yet it doesn't mention any engine-specific concepts if implemented in a video game like audio, graphics, or collision detection. If you can design and implement the rulebook this way completely decoupled from your engine concepts, then you'll have a portable AD&D implementation which can be used to work for any type of engine. You can even do overhauls that would break the designs of the most abstract of abstract designs like porting from a 2D engine to a 3D one without having to rewrite any of this AD&D code. Decoupling tends to be so valuable in gamedev and real-time computer graphics since design requirements are changing all the time with new techniques and even brand new hardware capabilities, and so much so that I think it's often worth creating some leakier abstractions or even turning certain things into just data if that decouples them from the outside world, even from abstract interfaces.

[@quickscope3643]

epic

[@FrostGamingHype]

make videos for code::blocks ide and with out olc it may help me to make my game engine because i have got all the 2D just looking forward to 3d it will be really helpful you can also install an darktheme for it

[@cjdaylight3407]

question : this is can give better perfomance than open gl

[@darkengine5931]

It's substantially cheaper than full-blown rasterization with a 2D Z-Buffer and 3D world->screen projections and inputs. But you can implement it in OpenGL as well in a frag shader if you want and skip the cost of the full-blown rasterization pipeline. It's cheaper no matter what graphics API you use.

[@cjdaylight3407]

@@darkengine5931 thanks for wonderfull reply

[@DiamondWolfX]

Could you try implementing a Doom-style engine?

[@GamerSaga]

any chance on a video on ai character shooting and attacking you?

[@makiskapa8291]

Even though it's a fascinating video to watch, it requires some programming experience. Can you do some tutorials for complete beginners?

[@firstname4337]

go and watch his older videos he said he's explains raytracing concepts in two previous videos he also explains some C++ concepts (like pointers) in older videos -- so go to his home channel and search for pointers but he isn't going to do a basic tutorial on how to program C++ and what "if" statements and "for loops" are that are plenty of channels that cover that -- do a youtube search for derek banas c++

[@makiskapa8291]

@@firstname4337 thank you for your advice kind sir!

[@Jkauppa]

3d ray marching, distance quick traverse voxel matrix

[@Jkauppa]

2d grid dda ray casting with 3d z-buffer (2d z-image), plot distance when you paint the vertical lines, simple doom or duke nukem 3d engine

[@Jkauppa]

also direct 360 degree render image, 2d ray cast in 360 degrees with z-buffer, various 3d-positioned vertical lines engine

[@Jkauppa]

most 3d raster "if logic" complications gone

[@Jkauppa]

also most 3d engine overdraw rules complications gone

[@Jkauppa]

just calculate the z-value (distance from the player point, in 3d) of the vertical drawn lines, and you are racing

[@bilalakol1959]

you use opengl?

[@DM-qm5sc]

Skyrim NPC's!!!

[@baze3541]

after watching 99999 of your videos and other cpp i still dont understand what and why 0.5f or 0.0f means????

[@javidx9]

😂 its a number represented literally as 0.5 or 0.0. The f tells the compiler that the number is to be represented as a 32 bit floating point, as opposed to a 64 bit double.

[@DFPercush]

^ What he said. But also, the reason you see this typed out a lot, is that the compiler tends to throw warnings when you implicitly down-cast a double (0.5) to an argument or variable of float type, due to loss of precision. Usually it's not a big deal, but nobody likes tons of warnings in their build. It's also common for certain functions to have two separate version for doubles and float, like sin()/cos() [doubles] vs sinf() and cosf().

[@GoldBearanimationsYT]

I have a simple game idea u could make in a week dm if ur interested

[@deaddesu4418]

Ничего не понимаю. Что я тут забыл.

[@maistrogaming7911]

Xbox bought bethesda...lol