Coding Challenge 144: 2D Black Hole Visualization

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The Coding Train

The Coding Train

Күн бұрын

Inspired by the recent image of the Powehi m87 black hole from the Event Horizon Telescope, I visualize the behavior or light (photons) following the path of spacetime around the black hole in p5.js. Code: thecodingtrain.com/challenges...
p5.js Web Editor Sketches:
🕹️ Black Hole Visualization - Newtonian Granvitational Attraction: editor.p5js.org/codingtrain/s...
🕹️ Black Hole Visualization - Code with Relativistic Corrections: editor.p5js.org/codingtrain/s...
🎥 Previous video: • Coding Challenge #143:...
🎥 Next video: • Coding Challenge #145:...
🎥 All videos: • Coding Challenges
References:
📓 Simulating a Black Hole!: www.asc.ohio-state.edu/orban....
🖌 How to draw a Black Hole: rantonels.github.io/starless/
📰 Astronomers Capture First Image of a Black Hole: eventhorizontelescope.org/
📓 Image of a Spherical Black Hole with Thin Accretion Disk: articles.adsabs.harvard.edu/cg...
Videos:
🎥 How to Understand the Image of a Black Hole: • How to Understand What...
🎥 Slingshot with Gravity!: • Slingshot with Gravity...
🔴 Coding Train Live 176: • Coding Train Live 176:...
Related Coding Challenges:
🚂 #7 Solar System (2D): • Coding Challenge #7: S...
🚂 #8 Solar System (3D): • Coding Challenge #8: S...
Timestamps:
0:00 Introducing today's topic: a black hole visualization
3:25 The elements in the black hole visualization
5:06 The event horizon
6:35 The accretion disk
8:35 What happens when light is traveling towards a black hole?
9:43 The theory of relativity
12:03 Let's Code!
13:52 Make a black hole object
16:57 Draw the accretion disk
18:49 Draw an unstable photon orbit
20:22 Create a photon class
23:25 Add velocity to the photons
25:46 Apply Newtonian gravitational attraction
31:36 Add a trail to the photon
38:17 Corrections to the code
40:14 Add the angle of velocity for the photon
0:00 Conclusion and suggestions for variations
Editing by Mathieu Blanchette
Animations by Jason Heglund
Music from Epidemic Sound
🚂 Website: thecodingtrain.com/
👾 Share Your Creation! thecodingtrain.com/guides/pas...
🚩 Suggest Topics: github.com/CodingTrain/Sugges...
💡 GitHub: github.com/CodingTrain
💬 Discord: thecodingtrain.com/discord
💖 Membership: kzbin.infojoin
🛒 Store: standard.tv/codingtrain
🖋️ Twitter: / thecodingtrain
📸 Instagram: / the.coding.train
🎥 Coding Challenges: • Coding Challenges
🎥 Intro to Programming: • Start learning here!
🔗 p5.js: p5js.org
🔗 p5.js Web Editor: editor.p5js.org/
🔗 Processing: processing.org
📄 Code of Conduct: github.com/CodingTrain/Code-o...
This description was auto-generated. If you see a problem, please open an issue: github.com/CodingTrain/thecod...
#blackholevisualization #eventhorizon #accretiondisk #javascript #p5js

Пікірлер: 271
@visualeyescollective8193
@visualeyescollective8193 5 жыл бұрын
Dan, your videos have helped me evolve from knowing basically nothing about Javascript to being offered a full time job in the space of one year. Thank you dude.
@badunius_code
@badunius_code 2 жыл бұрын
This is great but scary. I mean all the fors, and ifs, and vars, and scope pollution...
@Crazyclay78YT
@Crazyclay78YT Жыл бұрын
@@badunius_code can't forget the "this dot"
@luyuan0
@luyuan0 5 жыл бұрын
It's Friday night; wanted to relax and watch a movie, and ended up watching this :D Thank you for the video - you are one of the best!!!
@rajnishgupta8988
@rajnishgupta8988 Жыл бұрын
I wish I could relate man, I so so wish!
@lucafelicetti9605
@lucafelicetti9605 5 жыл бұрын
0:25 that synched-up hand gesture looks almost intentional
@jhoan7189
@jhoan7189 5 жыл бұрын
Luca Felicetti Lmao facts
@mihajlonesic
@mihajlonesic 5 жыл бұрын
Was gonna write this comment :D
@muranki1293
@muranki1293 5 жыл бұрын
Oh wow
@TheCodingTrain
@TheCodingTrain 5 жыл бұрын
Whoa, I did not notice this!
@user-qt6ju1hc9x
@user-qt6ju1hc9x 5 жыл бұрын
The other hand is the same syncing on the other side of the black hole 😆
@melvinlijiabraham4165
@melvinlijiabraham4165 5 жыл бұрын
One way to boost performance could be removing `background(255)` from `draw()` function and `history` from `Photon` class, so that there's no need to redraw the photon trails...
@TheMultifun
@TheMultifun 5 жыл бұрын
No one Engineers: c=30 and G=6
@francoissaab374
@francoissaab374 5 жыл бұрын
Don Grille super great
@user-or2gl9sq5d
@user-or2gl9sq5d 4 жыл бұрын
What are you talking about c = 299752458 m/s *SQUARED*
@johnheikens
@johnheikens 4 жыл бұрын
​@@user-or2gl9sq5d r/woooosh
@bartekm3878
@bartekm3878 4 жыл бұрын
@@johnheikens Speaking of reddit, is there a dedicaated subreddit for Processsing or coding challenges? I mean those coding challenges that The Coding Train does.
@simonmaracine4721
@simonmaracine4721 4 жыл бұрын
@@user-or2gl9sq5d Actually it's 299792458.
@domninin
@domninin 5 жыл бұрын
You could maybe write a ray tracer which does all of that stuff but from the front (send photons out from the "pixel layer" into the third dimension and see where they hit your pixel layer again) to render a picture
@thomasmclean9406
@thomasmclean9406 3 жыл бұрын
This deserves more likes
@MasterHigure
@MasterHigure 5 жыл бұрын
4:45 RIP youtube compression algorithm.
@SirPhysics
@SirPhysics 4 жыл бұрын
Not sure if anyone has pointed this out yet, but one reason all of your photons may be getting sucked into black hole is that you're not accounting for the timestep when updating velocity, only position. This means that the "force" being exerted on all of your photons is much larger than it should be.
@mockingbird3809
@mockingbird3809 5 жыл бұрын
Wow....You are really a Prodigy in JavaScript....Love your Enthusiasm and Teaching Style.
@Trekfolie
@Trekfolie 5 жыл бұрын
I'm learning Python atm but his style makes me want to learn JS instead. Welp I'm still watching his videos and enjoying it so much.
@sortof3337
@sortof3337 5 жыл бұрын
@@Trekfolie l did python for 5 years before I decided to come to JS. I still use python for ML and data stuff and scripting, but Node and P5 are on next level for web and Graphics stuff.
@kevnar
@kevnar 5 жыл бұрын
We know what the speed of light is. Now, at 24:04, we know what the sound of light is, too!
@thockinity
@thockinity 4 жыл бұрын
That sound he made was so funny, mostly because in his position i'd do exactly the same. That nice smooth animation, just asks for that sound
@effzee73
@effzee73 5 жыл бұрын
My new favorite channel on KZbin. Your stuff's brilliant so glad I found this channel
@iritesh
@iritesh 5 жыл бұрын
From a dull drawing to a crazy good simulation, this is what programming is!
@adrian5b
@adrian5b 5 жыл бұрын
I love this guy so much, makes JS so joyful.
@ersinmisto81
@ersinmisto81 5 жыл бұрын
I just wanna say thank you a lot for adding subtitles for hard of hearing. Please do so in the future
@MijeshDeuja
@MijeshDeuja 5 жыл бұрын
The quality on these videos are are getting amazing.
@calebsherman886
@calebsherman886 5 жыл бұрын
YES, I've always wanted to see this! Thank you!
@williampecoraro653
@williampecoraro653 5 жыл бұрын
c=30 G=6 All my engineering teachers are crying... But i love your videos
@williampecoraro653
@williampecoraro653 5 жыл бұрын
I would rather take one constant and make everything else in percentage about the first one
@TheCodingTrain
@TheCodingTrain 5 жыл бұрын
@@williampecoraro653 Yes, that's a great suggestion!
@Xnoob545
@Xnoob545 5 жыл бұрын
Isn't it like 9.8m/s sQuaREd?
@halusinjackbow8043
@halusinjackbow8043 3 жыл бұрын
Xnoob Speakable That would be lowercase g, the acceleration of gravity. Uppercase G is the gravitational constant, which doesn’t really directly apply to anything we see, but it is a vital value in calculating most gravitational interactions in the universe. But don’t take my word for it; I don’t know much about it at all.
@yourteacher4353
@yourteacher4353 5 жыл бұрын
I am speechless. You, sir, are a living legend.
@avi12
@avi12 5 жыл бұрын
Thanks to you, Dan, I was able to understand Derek's video. When I first watched it, I didn't understand it very much
@Helios.vfx.
@Helios.vfx. 5 жыл бұрын
You're the best, bro! Just got the book "The Nature of Code" and I'm enjoying it.
@cap.blue-97sama99
@cap.blue-97sama99 5 жыл бұрын
Watched the whole thing, You're a wonderful teacher!
@SotamiesTrolli
@SotamiesTrolli 5 жыл бұрын
The physicist inside me screamed you to set c=1
@luisangelpantojaarredondo4460
@luisangelpantojaarredondo4460 5 жыл бұрын
shoehaze and also g=1 😭
@thechrisgrice
@thechrisgrice 4 жыл бұрын
Then you're not really that much of a physicist. We often set c=1 in what's called Natural Units.
@kr4301
@kr4301 4 жыл бұрын
well theoretical physicists actually use natural units where c=hbar=1
@chefbennyj
@chefbennyj Жыл бұрын
"Then, I calculate the change in angle based on the relativistic curvature of space time" -Dan 👏 using JavaScript. 😀 😆 Man I love this channel.
@zacharymcarthur9013
@zacharymcarthur9013 4 жыл бұрын
While doing this coding challenge myself I named my class Blackhole and then created a Blackhole object saying, “let bhole;” “bhole = new Blackhole;” I did this for quite a while before my fiancé pointed out that maybe b-hole isn’t the best name for my Blackhole.
@iminni3459
@iminni3459 5 жыл бұрын
Nice editing for this video. :-)
@PilatusAnon
@PilatusAnon Жыл бұрын
I love how Veritasium's video on the black hole image was the 5th recommended video in my sidebar
@Madmadfr
@Madmadfr 5 жыл бұрын
Awesome as always, thank you very much for this :)
@venido8308
@venido8308 5 жыл бұрын
How he is doing the same movement with his hand at 0:24 xD
@danieldochev6019
@danieldochev6019 5 жыл бұрын
Lol
@lthoedt
@lthoedt 5 жыл бұрын
ffs i just wanted to stay that
@Kazutas
@Kazutas 4 жыл бұрын
lol what?
5 жыл бұрын
this is a good topic, thank you Dan!
@morphman86
@morphman86 4 жыл бұрын
This was relatively interesting. Here, have a thumbs up!
@RAWRCoding
@RAWRCoding 5 жыл бұрын
Great Video! I used to love making these types of projects in university!
@zonetwelve5881
@zonetwelve5881 5 жыл бұрын
Oh ya!, I love to see that again.
@finnk2551
@finnk2551 2 жыл бұрын
thank you for making such a great video! love it
@iradnuriel9087
@iradnuriel9087 5 жыл бұрын
Love those long videos so much!!!!!!!!!!! Very good video(I actually learned a lot from this video!!)
@muradeliyev6291
@muradeliyev6291 5 жыл бұрын
this guy deserves a medal
@JonathanChute
@JonathanChute 5 жыл бұрын
I watched you do this live - but I'm watching this just to see how you edited all your mistakes and corrections together XD Edit: Ah, you just refilmed the intro... Well played, Shiffman.
@TheCodingTrain
@TheCodingTrain 5 жыл бұрын
Yeah, I like leaving coding mistakes in, but if I'm getting actual science wrong it's too painful to watch!
@hrishikeshpatil7901
@hrishikeshpatil7901 5 жыл бұрын
I'd rather learn physics from you
@army6669990101
@army6669990101 5 жыл бұрын
I would learn anything from my professors if they had 1/3 of the amount of enthusiasm and heart he puts into his videos.
@zoltankurti
@zoltankurti 5 жыл бұрын
But you couldn't. He doesn't knoe much about physics.
@user-tj4ut8ox9r
@user-tj4ut8ox9r 5 жыл бұрын
Why is your channel doesn't get millions of views? It's such a good and quality content herw
@ammarkamel6324
@ammarkamel6324 5 жыл бұрын
cus the most people like to do easy things
@user-og2lt8ou8i
@user-og2lt8ou8i 4 жыл бұрын
_Thanks for having English captions Or subtitles_
@mattiarecchi4024
@mattiarecchi4024 4 жыл бұрын
Can you combine "rendering raycasting" with this? Would be awesome 😍
@QuiqueFlowers
@QuiqueFlowers 5 жыл бұрын
I luv JS and your explanation
@connorclub6244
@connorclub6244 Жыл бұрын
I noticed that you said something like "30 pixels per frame.. thats pretty slow for movement". But thats 900 pixels travelled a second, already past the screen!
@OrangeC7
@OrangeC7 5 жыл бұрын
10:40 - And hence one of the most terribly drawn whatever-those-squiggly-things-are-called-anyways-because-they're-probably-not-called-curly-brackets-when-they're-drawn-like-that-but-I-might-be-wrong was created!
@satyampandey2222
@satyampandey2222 5 жыл бұрын
Atleast he tried
@OrangeC7
@OrangeC7 5 жыл бұрын
@@satyampandey2222 Tru, tru
@best_beans1732
@best_beans1732 5 жыл бұрын
😂
@mralextacy
@mralextacy 5 жыл бұрын
simply amazing
@lazyyw4081
@lazyyw4081 5 жыл бұрын
I was about to go and sleep but a coding train notification popped up
@jamriissam5825
@jamriissam5825 5 жыл бұрын
Keep going you do awesome work ;)
@guyr989
@guyr989 5 жыл бұрын
Daniel. You are the BEST most annoying teacher I've ever seen. Thank you.
@Cowboy8625
@Cowboy8625 4 жыл бұрын
You are pretty cool man. I don’t use java script but I really like watching your videos and see how you work though the problem. I’m doing some of your challenges in python in tkinter.
@thedankatheist3466
@thedankatheist3466 5 жыл бұрын
I love this video 3000
@luismiguelgallegogomez8000
@luismiguelgallegogomez8000 5 жыл бұрын
Still starting to watch, but i'm sure the challenge will be awesome!
@TheCodingTrain
@TheCodingTrain 5 жыл бұрын
What did you think?
@luismiguelgallegogomez8000
@luismiguelgallegogomez8000 5 жыл бұрын
Was very interesting, i think the newtonian physics simulation actually yielded pretty accurate results
@samueleb.6739
@samueleb.6739 5 жыл бұрын
I WAS WAITING THIS SO BAD
@BrainKlar
@BrainKlar 2 жыл бұрын
hey one thing I do know is the movie interstellar they used allot of data to recreate the black hole. They scaled it up for visual aesthetics but supposedly was pretty accurate. They have a book on that movie and stuff that has it labeled speculative and factual or data driven ect. Their minds would be a good one to pick in how they rendered that prob love your videos!
@lellow4188
@lellow4188 5 жыл бұрын
One way to doing this more fun, is maybe by considering the time dilatation, and with this the photon will slow down and never go inside a certain circle, and with this you litteraly create a Black Hole =)
@ethanhermsey
@ethanhermsey 5 жыл бұрын
Hats off to matthieu ;) :D
@Saurastus
@Saurastus Жыл бұрын
Nice simulation. This is in essence a classical simulation of objects with mass moving towards a body in space, since you used newtonian physics to calculate the dynamics of each object. To calculate how photons would move one would use formulas from General Relativity. The simulation captures the photonring however which is nice to see.
@NobleMarcos
@NobleMarcos 5 жыл бұрын
I don't know you, i can't program for shit, would like to change that, and i would like to see a more serious simulation of a black hole, but none of that matters because you're so entertaining and make all this so interesting to watch, i'm amazed!
@Red_Skies
@Red_Skies 5 жыл бұрын
0:25 I like how he does the same arm gesture in both vids
@TheZenytram
@TheZenytram 5 жыл бұрын
the sync, pleasures my OCD
@jut2357
@jut2357 Жыл бұрын
Did you ever multiply the added gravitational force with your delta time? I feel like you will get different results depending on your time scale (dt) with this solution, since it affects the photons speed but not its attraction to the black hole. I know I'm three years late to this but if I'm wrong I'd be happy to hear an explanation :)
@JohnPatchesMicallef
@JohnPatchesMicallef 5 жыл бұрын
So, just for your information, when scientists run simulations of the caliber you want to do they run it on super computers and it takes days to months. My research advisor is doing gamma-ray burst jet simulations and he said it takes several minutes to generate just a few nanoseconds of simulation data. And that generation time will only increase as the jets expand outwards (getting exponentially larger).
@JohnPatchesMicallef
@JohnPatchesMicallef 5 жыл бұрын
Of course a 2 dimensional version with simplified visuals of a "simpler" system (like a black hole) would be much "easier" to generate, but I imagine the level of difficulty scales down about the same amount as the loss in computational power does. So it would still take a long time to generate the data.
@TheCodingTrain
@TheCodingTrain 5 жыл бұрын
Thanks for this feedback and additional info!
@goodclover
@goodclover 5 жыл бұрын
Amazing, love your vids, I used to do python but you inspired me to try JS and I've been looking it so far! Only thing I can't figure out is how to copy a variable without them being linked?
@A1rPun
@A1rPun 5 жыл бұрын
Primitive types get copied by value, objects (arrays) are copied by reference ("linked"). There are methods to deep copy arrays or objects but you don't need them that often. Modifying an array data structure usually happens with `.map` or `.reduce`.
@tezza48
@tezza48 5 жыл бұрын
"I don't play a physicist on youtube" is that a loose Scott Manley reference? :D
@FakeFakovick
@FakeFakovick 6 ай бұрын
Broooo.... My own task of my p5 chalange was make a black hole model, but u also does it😮
@SimonSozzi7258
@SimonSozzi7258 5 жыл бұрын
I think you had it right at 35:40. It just feels right!
@jingato
@jingato Жыл бұрын
you'd probably get a significant performance increase if you did not add to one end of the array an then delete from the other every frame. Instead, keep an index and just replace the item at that index. The way it is now causes you to have to shift every element of the array over every frame after you delete that first element. I'd also preallocate all the memory needed for that array rather than just add to it on demand. That way you won't need to keep reallocating memory for the buffer and copying the items to the new memory location when it grows. To piggyback off that, you should also be constantly updating the history so it represents a path of vertices using the least number of vertices needed. For example, those lines are straight for a long while so they really only need 2 vertices, whereas you have hundreds all in that straight line.
@matusjakuboc9623
@matusjakuboc9623 5 жыл бұрын
Gravitational constant is determined by unit m3 x kg-1 x s-2 or N x m2 x kg-2
@johaneric1400
@johaneric1400 5 жыл бұрын
Owh yeah....i love this when u talk about science and javascript..........😍😍😍😍😍😍😍
@EnfermeiroPensador
@EnfermeiroPensador 5 жыл бұрын
I think, is possible to use ray marching on top of that to create some kind of shader?
@antiphlex
@antiphlex 5 жыл бұрын
Light travels at the speed of itself.
@vidaroni
@vidaroni 5 жыл бұрын
Aren't we all, though? 🤔
@robertlister5192
@robertlister5192 5 жыл бұрын
Hi I have a question on your 7.6 object intersection how would it work with a square and a circle intersecting?
@muhammadisraraslam2487
@muhammadisraraslam2487 2 жыл бұрын
Thanks for this video, May i know which soft wear used for light rings around a black hole, Is this possible on Mathematica tool. Please tell me.
@pyrommph
@pyrommph 5 жыл бұрын
I genuinly love the 'let's neglect the generalrelativicity effect of... those photons orbiting the BH. The visuals, however, are really encouraging !! I really like the style of the channel!
@enverko
@enverko 5 жыл бұрын
5:36 Black holes are flat confirmed!
@imporbis345
@imporbis345 5 жыл бұрын
I have an idea for a coding challenge: Code an animation of the dijkstra algorithm. It should show how the algorithm works, so eventually it looks like some ants walking from one knot to another and they remember how long they need.
@gJonii
@gJonii 5 жыл бұрын
You wouldn't really notice entering inside black hole of that size, except that the starry sky becomes tiny hole above you and then disappears. You could live pretty comfortable for hours, maybe even days, assuming you had space suit that protected you from the radiation. Well, at least according to the current best guess of what inside of black hole is like.
@brunoharari6454
@brunoharari6454 5 жыл бұрын
You have to try to make it 3D that is gonna be cool!
@XKCDism
@XKCDism 5 жыл бұрын
ace stuff
@M.MaX1
@M.MaX1 5 жыл бұрын
I think is photon should be point not line so we can have batter imagination to the horizon and the photons should came from screen top right and down right to improve the some relation is really work... And thanks to the tutorial
@programmingwiththotho4641
@programmingwiththotho4641 5 жыл бұрын
nice
@KaizenCodes
@KaizenCodes 2 жыл бұрын
If we didn’t have blackholes, what were we supposed to do with all this light?
@rastislavsvoboda4363
@rastislavsvoboda4363 Жыл бұрын
Ďakujeme.
@TheCodingTrain
@TheCodingTrain 5 ай бұрын
Thank you for the support!
@ch3ragCS
@ch3ragCS 5 жыл бұрын
why did you divide deltaTheta by (1 - 2GM)/(rc^2)?
@morphman86
@morphman86 4 жыл бұрын
Funny thing, if you could get close enough to the black hole, within the event horizon, you would see something. Nobody knows what, but you would see something. The light is not fast enough to escape the event horizon, but it can still bounce up a bit before it is sucked back down. Because we don't know how the light behaves inside the event horizon, we're not really sure how to visualise it, or calculate its behaviour.
@soma7891
@soma7891 5 жыл бұрын
Can you make a video about the wave pattern of an audio?
@meeshoot3850
@meeshoot3850 5 жыл бұрын
Wouaahhh
@kwinvdv
@kwinvdv 5 жыл бұрын
If one would use the exact solution of Newtonian gravity (Kepler orbits), so do not compensate that the "photons" speeds up while faling towards the black hole, it can be shown that a particle would just graze the Schwarzschild radius (rs) if it start at sqrt(3)*rs≈1.73*rs. Coincidentally these particles also speed up at rs to a speed of sqrt(3) times the speed of light.
@42Hz
@42Hz 4 жыл бұрын
Is it possible to create a space-bend effect like on this picture: physicsworld.com/wp-content/uploads/2006/09/LLOYDblack-hole.jpg So this JS blackhole would warp a background image like this.
@thockinity
@thockinity 4 жыл бұрын
I'm pretty sure almost anything is possible to code, if you are a good enough programmer... Could i do it? saddly no, do i believe a good programmer could do that space-bend effect? I am pretty sure they could
@kernelpanic2887
@kernelpanic2887 5 жыл бұрын
One question I have, is if OOP is good or bad for CPU performance? I mean, the program needs to jump around, call methods in methods in methods, get models... Thank you for an answer :)
@experimentators8699
@experimentators8699 5 жыл бұрын
that's hard to answer the question because every programming language is different. but some algorithmic optimizations are prevented in OOPs due to encapsulation, and the synergy between 2 particular algorithms that work together is lost behind OO interfaces. But it might also depend whether the language is compiled or interpreted
@mina86
@mina86 5 жыл бұрын
12:25 - 6.67e-11. No need for pow plus using e is likely more precise.
@TheCodingTrain
@TheCodingTrain 5 жыл бұрын
Oh, yes, thanks for the tip!
@olma97
@olma97 Жыл бұрын
Could you do this and actually solve the field equations in js? Personally I would do it as a reverse ray-trace
@KhrisnaGunanasurya
@KhrisnaGunanasurya 5 жыл бұрын
Hi I wonder, where do you get the width and height thing in sketch.js? Because I don’t think I see you declare their value?
@TheCodingTrain
@TheCodingTrain 5 жыл бұрын
This is from the p5.js library, for more: p5js.org.
@johnzhang1821
@johnzhang1821 5 жыл бұрын
Now ima going to try to do this in python
@rutikwankhade337
@rutikwankhade337 5 жыл бұрын
What apps you use to edit your videos. Like a video in video background
@tinylittleanj2
@tinylittleanj2 4 жыл бұрын
RUTIK WANKHADE the second video is from his live streams (the long videos). Watch almost any of those and he almost always goes over the set up :)
@jakubkurdziel2407
@jakubkurdziel2407 3 жыл бұрын
In JS you can write numbers like 100_000_000 it means the same as 100000000 but its very better to read
@02Inam
@02Inam 4 жыл бұрын
could you do a video to show your setup
@arthurs5099
@arthurs5099 Жыл бұрын
I tried to code the gravitationnal lensing to put random photos of cats as sources. However, the way you find out the geodesique is just some fancy wizzard stuff.
@morphman86
@morphman86 4 жыл бұрын
29:28 Did that one photon just make an oberon maneuver using a black hole as its slingshot centre?
@hamadaag5659
@hamadaag5659 4 жыл бұрын
I have a question, people always say that objects bend the spacetime mesh but is the spacetime mesh a 2d mesh or a 3d mesh? And if it’s a 3d mesh how does it “bend”?
@ffggddss
@ffggddss 5 жыл бұрын
You include units for c = 299,792,458 m/s, but (even though they're pretty crazy!) you keep neglecting the units for G = 6.67·10⁻¹¹ m³/kg·s². And when you ask us to calculate R_s for M87*, you give M in solar masses, 1.6·10⁹ M⊙, but you also need to give us M⊙ = 1.99·10³⁰ kg. But this is something of a trivium. The main point is, this is a wonderful coding playground! Thanks for all you do, and just keep doing it! PS: The units for G can be verified by noting how, when plugged into that formula, all the units cancel down to just leaving meters behind. Which is correct for a radius. Fred
@plshalpme173
@plshalpme173 4 жыл бұрын
i have a serious problem at 3:48 i stop the video, turn on the song and don't come back for a week. please help me
@Melthornal
@Melthornal 5 жыл бұрын
If you want to keep a trail without a performance hit, couldnt you get rid of the background in the draw loop and instead put it in setup? That way each photon line update is permanent? All you need to do is connect the most recent step to the second most recent. So your history would be maxed at 1 instead of 500 or whatever. In many applications this could make a messy mess but in something like this I see no downside.
@TheCodingTrain
@TheCodingTrain 5 жыл бұрын
Yes, this is a good idea! Using createGraphics() for the photon trails would be a great solution.
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