This PHOTOREAL cave set my RTX 4090 on FIRE | Unreal Engine 5.1 | 4K HDR

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  • Опубликовано: 21 дек 2024

Комментарии • 702

  • @changeagent228
    @changeagent228 2 года назад +770

    It's sharper than real life. Give it another decade and we will be able to create mind blowing visuals.

    • @MelhemSfeir
      @MelhemSfeir  2 года назад +19

      Thanks

    • @RealmDesigner
      @RealmDesigner 2 года назад +28

      This is mindblowing!

    • @sbrown9020
      @sbrown9020 2 года назад +2

      Yes I agree. Great work

    • @LauLauHip
      @LauLauHip 2 года назад +3

      You know that one vr headset? Mindblowing in the most litteral way!

    • @Anonymous-vd5yd
      @Anonymous-vd5yd 2 года назад

      i dont think ull need a decade... rtx 6090 should be 5x stronger than 4090

  • @anwarnaveedali4412
    @anwarnaveedali4412 2 года назад +1100

    The only thing that spoils it is the water physics. Looks Amazing

    • @TrollAxeThrower
      @TrollAxeThrower 2 года назад +65

      I really think Epic should try to make a standard customizable water themselves. But getting foylege into nanite, and real time reflections were top priority, and probably there is more to come.

    • @jodimambro6543
      @jodimambro6543 2 года назад +16

      @@TrollAxeThrower For sure. Bring on 5.2

    • @bulletsmichael
      @bulletsmichael 2 года назад

      Yep

    • @guily6669
      @guily6669 2 года назад +11

      Though I still liked the water.
      But I remember some video of unreal 4 latest water physics and they looked great but I never see them being used anywhere sadly ☹️
      Anyway my PC probably thanks for nobody using them 🤣

    • @Grenzo_
      @Grenzo_ 2 года назад +6

      @@TrollAxeThroweryou mean foliage

  • @Chyronn
    @Chyronn 2 года назад +276

    The water lapping on the sand gives it away that this is not reality. But other than that, it's almost spot-on! Well done

    • @henryjohnson-ville3834
      @henryjohnson-ville3834 2 года назад +5

      Yeah, the water is TOO active in that sort of place.

    • @WaspMedia3D
      @WaspMedia3D 2 года назад +15

      The water movement, the lack of retained wetness after the wave recedes, the levitating paper light sticks in the water, the caustic reflection that come from nowhere - there's a lot wrong with this scene. But what it does get right is damn impressive.

    • @heroninja1125
      @heroninja1125 2 года назад +4

      @@WaspMedia3D also not to mention theres typically a distinguishable layer of haze above the water, from vapours and splashes.

    • @MrTesteur
      @MrTesteur Год назад

      @@henryjohnson-ville3834 it's nowhere too active, the width reduction of the stream turning into vertical/stronger activity..
      ruclips.net/video/pSsJ44h8nK8/видео.html
      Haven't you heard those 'breathing' holes along rocky shores and the power of their 'breathings' ?
      ruclips.net/video/E3EaXJRdS1A/видео.html

    • @Lolp821
      @Lolp821 Год назад

      Still looks not right, it'll never emulate real life with movement, and it never should, why are we praising this? Gaming shouldn't be like real life, and never will be. It will always look strange, they can pull off still photographs looking real, but not any movement.

  • @LetLiveEverything
    @LetLiveEverything 2 года назад +48

    This is what it felt like in 2012 when I booted up Crysis on my ghetto PC for the first time. It's amazing how much our perception of what looks "real" in video games changes over time. Years ago, it was FEAR, Crysis, Far Cry 2. Now we're starting to push rendering techniques like ray tracing and photogrammetry and it's like I get to be amazed for the first time all over again at the incredible things we force a bunch of electricity, minerals, metal and plastic to do.

    • @DelcoAirsoft
      @DelcoAirsoft 2 года назад

      It's a shame that Far Cry 2 was really the last game to push physics and A.I. in a videogame.

    • @thelelanatorlol3978
      @thelelanatorlol3978 Год назад

      @@DelcoAirsoft Physics are determined by the physics engines, physics engines have massively improved in capabilities, efficiency and most importantly, stability since the far cry 2 days.

  • @Darhan62
    @Darhan62 2 года назад +1

    The floating branches and general way the water interacts with the shore is what gives it away as CGI. They've never been able to come up with a completely convincing water-land interaction, even when the surface of the water itself looks really good.

    • @ytwos1
      @ytwos1 2 года назад +1

      Flock of birds also scream fake and the foliage on the rocks right hand side also looks a bit suspect. But yes, this is great and also precisely the kind of thing the new engine excels at imho. Like the very first demo real opening scene.

  • @damanraaj3496
    @damanraaj3496 2 года назад +15

    Everyone noticed the unreal water but i found the glowing rocks odd at :38 and bottom left at :50. RTGI has opened my eyes.

  • @AllanGildea
    @AllanGildea 2 года назад +171

    That really is VERY close to photoreal, especially on the wides. Congratulations, Melhem. Stunning work.

    • @MelhemSfeir
      @MelhemSfeir  2 года назад +6

      Thanks a lot Allan

    • @mistycloud4455
      @mistycloud4455 Год назад +1

      A.G.I Will be man's last invention

    • @wbass243
      @wbass243 Год назад

      its cool, but the layer of water ripple cast on the rocks looks un natural in the shadows. It is cast on the bright rocks which looks correct, but it is also cast at the same intensity in the shadows. Then the light panning just over saturates it or washes it out. Which it should do on the direct lit rocks. But the shadows bounce or lighting shouldnt have those ripple effects at a similar value as the other parts of the scenery. Just my opinion.

    • @mdc123-v2v
      @mdc123-v2v Год назад

      Nowhere near "photoreal" unless you've never been outside before.

  • @puredruid
    @puredruid 2 года назад +19

    The level of detail is crazy. The way the light bounces off the water and reflects on the rock looks so realistic.

    • @WaspMedia3D
      @WaspMedia3D 2 года назад +7

      Actually the caustic reflections on the shaded backside of the rock reflecting from nothing against the sun direction, makes it totally unrealistic. The effect itself looks nice, but how it was applied makes it look unrealistic.

    • @dasarus
      @dasarus 2 года назад

      @@WaspMedia3D These are just Textures not really a real Caustic. I think there is no Engine or Hardware able to Calculate Caustics in Real Time.

    • @WaspMedia3D
      @WaspMedia3D 2 года назад

      @@dasarus Of course they aren't real caustics - that is impossible in real time. But that's what they are trying to be.
      If they were real, they wouldn't be in entirely the wrong spot with no light source to cast them. That's why they are unrealistic.

    • @Lolp821
      @Lolp821 Год назад

      I thought you were joking initially.

  • @jenkem4464
    @jenkem4464 2 года назад +122

    This is just the start folks. Nanites and lumen changed the game and now that we have gfx cards capable of doing real-time raytracing...we're headed into a golden age of vfx/game/vr. What a time to be alive! (two minute papers tribute)

    • @thetranya3589
      @thetranya3589 2 года назад +7

      Let’s see how excited you are when you realize that this will be your only option to escape reality in a few years, if you are lucky.

    • @4doorsmorewhors
      @4doorsmorewhors 2 года назад +1

      @@thetranya3589 in a couple years? Yeah like 30-40

    • @j.charlesmarr8684
      @j.charlesmarr8684 2 года назад

      Who needs raytracing when lumen is better anyway?

    • @jenkem4464
      @jenkem4464 2 года назад +3

      @@j.charlesmarr8684 Lumen is a software raytracer but it also supports hardware raytracing. :)

    • @jenkem4464
      @jenkem4464 2 года назад +3

      @@thetranya3589 I already use it to escape reality, or create my own, so I'm fine with that!

  • @bmack500
    @bmack500 Год назад +1

    There were some sticks floating above the water at the beginning. Pretty darn good, though.

  • @MrGTAmodsgerman
    @MrGTAmodsgerman 2 года назад +108

    Give it 5 years and this will be normal. Insane. Nearly to a point where you don't need a real vacation anymore. Expecially with 5.1 VR Support.

    • @MelhemSfeir
      @MelhemSfeir  2 года назад +4

      Thanks

    • @steveafanador6441
      @steveafanador6441 2 года назад +17

      Yup it's coming. 👍👍 You will be able to download your vacations

    • @MrGTAmodsgerman
      @MrGTAmodsgerman 2 года назад +1

      @@steveafanador6441 Or a good way to solve your sleeping problems. Calms you down, get your mind calm.

    • @qrcus
      @qrcus 2 года назад +2

      but how will i sunbath ? :[

    • @MelhemSfeir
      @MelhemSfeir  2 года назад +2

      @@qrcus really strong flood lights?

  • @MatthewRumble
    @MatthewRumble 2 года назад +3

    How did you create those birds flying?

  • @nit3h8wk81
    @nit3h8wk81 2 года назад +11

    This will certainly make VR more mainstream in the future.

    • @realmasterkush
      @realmasterkush 2 года назад +2

      Look at Kayak VR: Mirage. Insane photoreal experience in VR.

  • @fawadfarooq
    @fawadfarooq 2 года назад +13

    Awesome ,mind blowing i can see your effort. And camera moves are great. Giving it more dynamic look .

  • @zyxyuv1650
    @zyxyuv1650 Год назад

    I just noticed that you ❤'d someone's comment who posted: "The water looks amazing" that really shows how you'd rather be praised for your failures than to actually improve. I would have had more respect for somebody who loved the comments about the water being bad because that shows you're really on top of things and you get it.

  • @gokayakcay7093
    @gokayakcay7093 Год назад +1

    I can't even imagine how it is going to be used with VR in future. Just amazing..

  • @LUKEY_D_FRESH
    @LUKEY_D_FRESH Год назад +1

    this is akin to what the hl2 lost coast demo was in 2005. just simply incredible; i do still think the water could be better though

  • @rvoros
    @rvoros 2 года назад +19

    1:10
    love the totally fake caustics on the wrong side of the rock
    BTW, the whole scene looks amazing

  • @Ash_Hudson
    @Ash_Hudson Год назад +1

    You know it's good when you feel like you physically want to be there.

  • @snilloconator
    @snilloconator 2 года назад +1

    You can tell that no humans where there as there is no plastics collecting at the shoreline. Nice work @melhem.

  • @jamaga7331
    @jamaga7331 Год назад

    You know we really are speedrunning tech achievements when these kind of graphics will become a casual thing in a decade.

  • @koberko
    @koberko 2 года назад +1

    Only two things that brake immersion are, water at some points because it recedes to fast in shallow parts) and water caustics on rocks that are no way near water or to far away from it; those caustics would in real-life be visible only on rocks that are close to water that is shined by direct sunlight; I would actually turn off that caustics completely.
    Beside that; amazing!

  • @windcatcher8510
    @windcatcher8510 2 года назад +1

    Looks really great. However, the water physics still have a long way to go. Splash physics, general movement, viscosity, varying flow speed, and ground/objects getting wet. All of these and more are areas for improvement. For example, the way water drains from the sand once the wave crashes on the beach and washes up or wraps around a surface/rock. All areas for improvement.

  • @Nethrex
    @Nethrex 2 года назад +4

    Damn bro this looks amazing!!!
    I feel like a bit of film grain and a very very slight blur would've bumped the realism up a bit as it's a bit crisp, but looks absolutely amazing none the less! Great work :D

    • @MelhemSfeir
      @MelhemSfeir  2 года назад

      Thanks!

    • @willmcclard206
      @willmcclard206 2 года назад

      i think the point was to make it as crisp as possible

    • @Wylie288
      @Wylie288 Год назад

      Real life doesn't have film grain or blur. So no.

    • @Nethrex
      @Nethrex Год назад

      @Post Rock Mixes it’s not vr, it’s meant to be watched on a screen. Meaning it “comes from a camera” realistically. If you know anything about that sort of thing you’ll know film grain and blur is always used to hide the unrealistic/animated characteristics and make it feel like it was recorded on an imperfect camera.

  • @MrFabRom
    @MrFabRom 2 года назад +7

    absolutely amazing.. everything seems real except for the water

  • @Ramzi-Sfeir
    @Ramzi-Sfeir 2 года назад +5

    WOOOOOOOOOOW !!!!!!!!!!!

  • @nxtboyIII
    @nxtboyIII 2 года назад

    Dude. Great work!!!!! Beautiful.
    Are the rocks photoscans?

  • @KO-gu6wp
    @KO-gu6wp 2 года назад +3

    Do you use ray trace reflections in this or lumen reflections?

  • @karvak1492
    @karvak1492 Год назад +1

    Minek kell 60fps 30fps helyett? Pocsekolod vele a lóeröt. Itt nincs semmi gyorsan változó látvány, hogy megérné.

  • @LKDesign
    @LKDesign Год назад

    That slow reaction of the indirect lighting system. I guess it's good enough for use under regular gaming conditions though.

  • @Dravedude21YA
    @Dravedude21YA 2 года назад

    You can't just play God and change the time whenever you feel like it! This actually looks incredible, and it blows my mind with all the things UE 5 can do! Amazing Work

  • @bigmikeolan4154
    @bigmikeolan4154 2 года назад

    to do this type of 3d modeling and this realistic water is sure made by a great professional😉

  • @L0giBear
    @L0giBear 2 года назад +4

    the caustics reflecting off of the water are insane dude

    • @lemovision
      @lemovision 2 года назад +1

      Caustics on the ground have zero reasons to be there though

    • @jenkem4464
      @jenkem4464 2 года назад

      They are cool but definitely not a good fit for this particular scene. Works more on like an indoor pool or like an underwater base water bay or something. I don't think you'd get enough bounce light in a cave system like that and definitely not that regular of an repeating pattern.

  • @akispolykandriotis4970
    @akispolykandriotis4970 2 года назад +5

    Hey Mel that's amazing graphics ! Reminds me of summer and I like it even more 😍

  • @10whiten99
    @10whiten99 2 года назад

    A scenic rock climbing game using all this technology to the max would be pretty nice and probably run pretty well on console

  • @Ramt33n
    @Ramt33n Год назад +2

    would be cool to mix your ocean sound with some "cave convlusion reverb" effects to sell the cave idea even better. Great work!

  • @DaCashRap
    @DaCashRap 2 года назад

    other than poor water and foliage pop-in looks amazing!

  • @JeffGeraghty
    @JeffGeraghty 2 года назад +1

    Speechless.

  • @arcsinjesse
    @arcsinjesse Год назад

    this looks incredible, fantastic job!

  • @unoqualunque77
    @unoqualunque77 2 года назад +2

    Really incredible stuff.
    Well done!
    The only thing I'll change are all those caustics all over the rocks that are unreal. My opinion.

  • @Carsonogenisis
    @Carsonogenisis Год назад

    This is amazing, I cannot wait to play games like this in the future.

  • @derelicts9503
    @derelicts9503 2 года назад +7

    This is insanely beautiful. 2:15 is magical.

  • @lucascastro6930
    @lucascastro6930 2 года назад +1

    It's amazing!! Could you tell me how you made the water? Thanks in advance.

    • @MelhemSfeir
      @MelhemSfeir  2 года назад

      Thanks! It’s with a plugin called Oceanology

  • @gragulica
    @gragulica Год назад +2

    add wind for plants

  • @MatthewRumble
    @MatthewRumble 2 года назад +1

    Oceanology or fluid flux? Which one is better?

  • @fl1nch_155
    @fl1nch_155 2 года назад +1

    The water looks amazing

  • @joos3D
    @joos3D 2 года назад

    The only thing that breaks the immersion is the single point audio source that makes it sound like it's a small speaker rather than waves that's emitting the sound. I'd suggest making it less directional by increasing the spread, maybe add some cave reverb. Really nice demo!

    • @Lolp821
      @Lolp821 Год назад

      The fact it all looks computer generated gave it away to me.

  • @petersuvara
    @petersuvara 2 года назад +2

    The years go by and we get closer to a visual representation of reality. Now we just need our olfactory simulations to catch up. :)

  • @Gleichtritt
    @Gleichtritt Год назад

    Unreal engine, deep fake and ai combined will make things possible, both scary and amazing

  • @holorn1280
    @holorn1280 2 года назад +1

    Stunning. Even though the water is actually really good

  • @artmaknev3738
    @artmaknev3738 Год назад +1

    Amazing quality!

  • @MatthewRumble
    @MatthewRumble 2 года назад +1

    Was this made using megscans?

  • @patlezinc
    @patlezinc 2 года назад +1

    Congratulations!!
    Good work.
    Is this demo available? I would like to test it on my 4080 (but in 1440p)

  • @adrianomoura9684
    @adrianomoura9684 2 года назад +12

    With the exception of the water, the entire scene is indistinguishable from real life (to me, of course)

    • @GraveUypo
      @GraveUypo Год назад

      nah, super bad sheen on materials that shouldn't be there. it's weird that it is, lumen is supposed to fix that.

    • @adrianomoura9684
      @adrianomoura9684 Год назад

      @@GraveUypo its why i said to me 😁

  • @SandMan_86
    @SandMan_86 2 года назад +1

    Everything looks amazing apart from the water...much better simulations out there for that.

  • @seanspitzer5537
    @seanspitzer5537 Год назад

    Did you make the Ocean or was it purchased?

  • @vikingnusantara
    @vikingnusantara Год назад

    I dont know why, but i'ts giving me a goosebump, is our life is really a simulation created by the aliens / god. To think of it, it is just a simulation to the power of 9999999999999999

  • @casperdecrook2612
    @casperdecrook2612 Год назад

    truly stunning, but I really hope that there will be a better interaction with land and water, now it looks like its just rising water out of the ground, not interacting water that gets pushed off from the sea to the shore

  • @alexeynaidenov4697
    @alexeynaidenov4697 2 года назад +7

    I cant even imagine what UE7 would be like

  • @OversikerSTUDIO
    @OversikerSTUDIO 2 года назад

    the future of videogames!!!

  • @gerardelmonte285
    @gerardelmonte285 2 года назад +2

    Hello.. great work melhem.. do you sell this unreal engine file?

    • @MelhemSfeir
      @MelhemSfeir  2 года назад

      Thank you. Can’t with this one

  • @joserobertostedile8311
    @joserobertostedile8311 2 года назад +2

    Very beutiful! But the floating wood sticks need to be more heavy.

  • @chriscoppens3535
    @chriscoppens3535 Год назад

    The rocks look really nice. Are they from Quixel Megascans?

  • @m-hcv
    @m-hcv 2 года назад +1

    At 0:12 the light on the plants top middle brightens for no apparent reason.
    That gives it an immediate 'videogamey' look to it.

    • @MelhemSfeir
      @MelhemSfeir  2 года назад

      Mmmm not sure what you mean? It’s the sunlight

    • @flynntaggart7216
      @flynntaggart7216 2 года назад +2

      Bruh tf are you talking about

    • @m-hcv
      @m-hcv 2 года назад

      @@MelhemSfeir Right from 0:12 to 0:13 the plants go from darker to lighter

  • @khedermobasser9823
    @khedermobasser9823 2 года назад +2

    wow very nice😀😃🥳🤠

  • @zamardii12
    @zamardii12 Год назад

    This is how I remember the beginning of Crysis looking when I first played it.

  • @gst9325
    @gst9325 Год назад

    did you use engine water system or something from the store ? thx
    edit: caustics are way too strong and in incorrect places, seems to me

  • @kamranki
    @kamranki 2 года назад +1

    Water always gives it away. It's so hard to do. But a good effort!

  • @jamespython5147
    @jamespython5147 2 года назад

    Unreal! Amen!

  • @francodintino1975
    @francodintino1975 Год назад

    WOW 😮, it’s amazing !!, . What’s your pc setup for work and run this ?

  • @VSimCardV
    @VSimCardV 2 года назад

    Cool! Which water shader did you use? Or how did you create it??

  • @antongrotov6840
    @antongrotov6840 Год назад

    Hi! Cool staff! Can you recommend some starting courses to UE to start making renders like this? Thanks in advance!

  • @Rhedox1
    @Rhedox1 2 года назад

    There's someissues with specular highlights in shadows and the caustics are completely off but overall it looks amazing.

  • @inceptional
    @inceptional Год назад

    It's crazy to think that these are the kinds of visuals we'll be seeing in VR in due course.

  • @somethingtojenga
    @somethingtojenga 2 года назад

    There's some blue underside lighting on the rocks just above the sand facing downward that definitely should not be there unless the sand is glowing blue lol.

  • @victorblanchard7774
    @victorblanchard7774 2 года назад +2

    How did you manage to get that foam ? I’m stuck with my boat animation because of the foam (you can see on my profil a video where i could export the waves as alembic file, but had no success to export the foam) would love to hear from you!! Amazing work 🎉

    • @MelhemSfeir
      @MelhemSfeir  2 года назад +3

      Thanks victor. The foam and waves are part of the Oceanology plugin

    • @victorblanchard7774
      @victorblanchard7774 2 года назад +1

      @@MelhemSfeir thanks for input I will give it a try

  • @foxfx3956
    @foxfx3956 2 года назад

    Can you please tell me what kind of water is used here? What is the name of the asset?

  • @jenkem4464
    @jenkem4464 2 года назад

    Really cool. The only things that took me out of the scene were some of the odd lighting issues and the static ferns/foliage. There seemed like a wierd clear coat effect or shininess to some of the assets that were still lit while out of the light and looked really out of place in the dark shadowed areas. Also that persistent caustic gobo/fake caustic effect seemed a bit out of place. You generally would only see that if you had lights in the water shooting their rays up or when you're in the water and the sun is creating that effect on the surface of objects that are in the water. You might get a bit of bounce light in caves but def not that much and that regular or maybe it just wasn't a good match for the scene and the irregular patterns that you'd get from the tide water like that.
    Other than that...very effective scene!

  • @DarkVodka-gg7oy
    @DarkVodka-gg7oy Год назад

    lol, the soil/stones are water proof. UNREAL!

  • @cptairwolf
    @cptairwolf Год назад

    Can we download the unreal engine source file for this tech demo anywhere? I'd love to see it running on my 3090!

  • @ludologian
    @ludologian 2 года назад

    was the caustic realtime?

  • @daddyfox7078
    @daddyfox7078 Год назад

    hello its a very good job,tell me please where can i find your cave mesh? and texture

  • @frankjager1647
    @frankjager1647 2 года назад +12

    So the funny thing is, with all the details and stuff; if you crank this down to say 480p, it genuinely does look real in every sense.

  • @iamprogressivenpc6559
    @iamprogressivenpc6559 2 года назад

    the lighting is unreal! no pun intended

  • @BeckOfficial
    @BeckOfficial 2 года назад

    Water, or fluids in general, will always be one of the hardest things to make realistic. I don't really think we will see any true realistic smooth fluid dynamics in games before we get quantum computers 😅
    Other than that. This looks amazing!

  • @juanhito2636
    @juanhito2636 2 года назад

    No chance delivering a downloadable demo please ??

  • @manoahvanderwolf3259
    @manoahvanderwolf3259 2 года назад

    imagine what the unreal engine 6 will achieve. UNREAL.
    now i want a remake of the original UNREAL game, Unreal : The Awakening, Unreal Tournament (2003), and Half-Life 1 & 2. And i want that matrix game.

  • @krisl2838
    @krisl2838 Год назад

    How fast the water goes in and out break immersion.

  • @Nilo57371
    @Nilo57371 Год назад

    The graphics are so realistic that I thought it was real at first. Is there a download link for it? Thank you!

  • @oscardesignstudios
    @oscardesignstudios Год назад +1

    9/10, repair that water and will be a 10.

  • @tjnaples
    @tjnaples 2 года назад +1

    The lighting, shadows, and rocks are the rockstars of this clip. The foam in the water...is not.

  • @mvestudiografico634
    @mvestudiografico634 2 года назад +1

    Hello, how are you? Fantastic work, do you think it would be possible to run this project on an RTX 3070?

    • @MelhemSfeir
      @MelhemSfeir  2 года назад

      Hi! Yes , the 3070 is fantastic. But probably would run better at 1440 p

  • @sewitscherhd5493
    @sewitscherhd5493 2 года назад +1

    Thats Amazing!!!

  • @cyranodebergerac6019
    @cyranodebergerac6019 2 года назад +1

    how much vram did you used
    for that please ?

  • @tonyclif1
    @tonyclif1 2 года назад +1

    Stunning!

  • @altdoom5205
    @altdoom5205 Год назад

    Where is the link to the demo?

  • @MuromachiLines
    @MuromachiLines 2 года назад

    Can you use TNT like in Minecraft?

  • @mikeking087
    @mikeking087 Год назад +1

    the water 😁

  • @CyberOakEMpiRE
    @CyberOakEMpiRE 2 года назад

    which system did you use for the water?

  • @today05
    @today05 2 года назад +1

    the water landing on shore is not there yet, but the static parts are a pure mindf**k. i remember my riva TNT and what that could do, and we reached this in not even 3 decades. its borderline magic

    • @Wylie288
      @Wylie288 Год назад

      It could be. This is just a graphics demo. Not a physics demo.