The Tale Of The Unscrewable Bolt! 🔩

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The Tale Of The Unscrewable Bolt! 🔩

Two Minute Papers 21.09.2021 86 787 просмотров 5 338 лайков

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❤️ Check out Weights & Biases and sign up for a free demo here: https://wandb.com/papers ❤️ Their mentioned post is available here: https://wandb.ai/mathisfederico/wandb_features/reports/Visualizing-Confusion-Matrices-With-W-B--VmlldzoxMzE5ODk 📝 The paper "Intersection-free Rigid Body Dynamics" is available here: https://ipc-sim.github.io/rigid-ipc/ Scene credits: - Bolt - YSoft be3D - Expanding Lock Box - Angus Deveson - Bike Chain and Sprocket - Okan (bike chain), Hampus Andersson (sprocket) 🙏 We would like to thank our generous Patreon supporters who make Two Minute Papers possible: Aleksandr Mashrabov, Alex Haro, Andrew Melnychuk, Angelos Evripiotis, Benji Rabhan, Bryan Learn, Christian Ahlin, Eric Haddad, Eric Martel, Gordon Child, Ivo Galic, Jace O'Brien, Javier Bustamante, John Le, Jonas, Kenneth Davis, Klaus Busse, Lorin Atzberger, Lukas Biewald, Matthew Allen Fisher, Mark Oates, Michael Albrecht, Nikhil Velpanur, Owen Campbell-Moore, Owen Skarpness, Ramsey Elbasheer, Steef, Taras Bobrovytsky, Thomas Krcmar, Timothy Sum Hon Mun, Torsten Reil, Tybie Fitzhugh, Ueli Gallizzi. If you wish to appear here or pick up other perks, click here: https://www.patreon.com/TwoMinutePapers Thumbnail background image source: https://pixabay.com/images/id-1924173/ Thumbnail background design: Felícia Zsolnai-Fehér - http://felicia.hu Meet and discuss your ideas with other Fellow Scholars on the Two Minute Papers Discord: https://discordapp.com/invite/hbcTJu2 Károly Zsolnai-Fehér's links: Instagram: https://www.instagram.com/twominutepapers/ Twitter: https://twitter.com/twominutepapers Web: https://cg.tuwien.ac.at/~zsolnai/

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Intro

Dear Fellow Scholars, this is Two Minute Papers with Dr. Károly Zsolnai-Fehér. I have to say we haven’t had a simulation paper in a while so today’s episode is going to be my way of medicating myself. You are more than welcome to watch the process. And this paper is about performing collision detection. You see, when we write a simple space game, detecting whether a collision has happened or not is a mostly trivial endeavor.

Simulation

However, now, instead, let’s look at the kind of simulation complexity that you are expecting from a Two Minute Papers video…first, let’s try to screw this bolt in using an industry standard simulation system, and it is…stuck. Hm…why? Because here, we would need to simulate in detail, not only whether two things collide, they collide all the time, but, we need to check for and simulate friction too! Let’s see what this new simulation method does with the same scene. And…oh yes! This one isn’t screwing with us and does the job perfectly. Excellent. However, this was not nearly the most complex thing it can do.

Experiment

Let’s try some crazy geometry, with crazy movements and tons of friction. There we go. This one will do. Welcome to the expanding lock box experiment. So, what is this? Look, as we turn the key, the locking pins retract, and the bottom is now allowed to fall. This scene contains tens to hundreds of thousands of contacts, and yet, it still works perfectly. Beautiful. I love this one because with this simulation, we can test intricate mechanisms for robotics and more before committing to manufacturing anything. And, unlike with previous methods, we don’t need to worry whether the simulation is correct or not, and we can be sure that if we 3D print this, it will behave exactly this way. So good! Also, here come some of my favorite experiments from the paper. For instance, it can also simulate a piston attached to a rotating disk, or, smooth motion on one wheel, leading to intermittent motion on the other one.

Timestep

And, if you feel the urge to build a virtual bike, do not worry for a second, because your chain and sprocket mechanisms will work exactly as you expect to. Loving it. Now, interestingly, look here. The time step size used with the new technique is a hundred times bigger, which is great, we can advance the time in bigger pieces when computing the simulation.

Simulation Time

That is good news indeed. However, every time we do so, we still have to compute a great deal more. The resulting computation time is still at least a hundred times slower than previous methods. However, those methods don’t count, at least not on these scenes, because they have produced incorrect results. Look at it some other way - this is the fastest simulator that actually works. Still, it is not that slow. The one with the intermittent motion takes less than a second per time step, which likely means a few seconds per frame, while the bolt screwing scene is likely in the minutes per frame domain. Very impressive! And,

Outro

if you are a seasoned Fellow Scholar, you know what’s coming, this is where we invoke the First Law Of Papers, which says that research is a process. Do not look at where we are, will be two more papers down the line. And the line, I am sure even the more complex simulations will be done in a matter of seconds. What a time to be alive! Thanks for watching and for your generous support, and I'll see you next time!

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