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Working on a procedural damage modifier in geometry-nodes. Trying to avoid the use of mesh-boolean cause still too slow IMHO. Full flexibility, plus I'll add control via weight-paint. Might then post it on Gumroad if people show enough interest. #b3d #geometrynodes

13,508 次观看 • 4 个月前 •via X (Twitter)

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This post about bench press safety escaped containment and got a lot of people commenting in disagreement that safeties/spotter arms would've saved him. And in truth, my language below was a little too absolute: safeties MIGHT have saved his life (though even if so, would not have prevented all damage), but it's far from certain that they would have, so I stand by the overall sentiment. I will explain in detail below. The spotter arms have to be set below the top of your arched chest or else they’ll interfere with every rep - you'll clang the bar on the safeties, which not only severely interrupts proper technique and performance, but can also be potentially injurious in its own right as the clanging against the safeties takes you out of the rhythm of the rep and leads to uneven and chaotic force application demands mid-rep. The safeties can’t be set a mere milimeter or even a half inch below the chest: both because most racks have 2-3 inch hole spacings that don't allow such finely calibrated setting, but even if they do - also because as a gross movement pattern, not a fine movement pattern, you can’t control the movement of the bar precisely and accurately enough not to clang the safeties if they’re so close to your chest. Human beings performing gross movement patterns simply lack such fine control: on heavy sets, the bar might be slightly uneven on one side, you might lose a touch of your arch over the course of the set, etc... and end up clanging the safeties anyway, if they're set so close to the top of your arched chest. These issues are not form errors that can be prevented with proper training, but are inherent limitations in the human capability to control gross motor pattern movements at a heavy weight. Thus, the safeties have to be far enough below your chest in order to not interfere with the set itself, such that they can’t possibly catch the bar before it hits your chest in the case of a sudden catastrophic drop. The proper placement for the safeties is far enough below your chest so as not to interfere with the normal execution of the set and so the bar never touches the safeties at all during the set, even with the inherent human limitations of gross motor pattern control. But high enough such tha - if you find yourself unable to successfully press the bar to lockout - you can bring the bar under control back down to your chest, exhale and drop your arch, and the bar will ideally now rest on the safeties instead of your chest and you can crawl and slither out from under it. Worst case, you can roll the bar slightly upwards and the safeties will soon take it, well before it would lie on your neck. I have an example of using the safeties this way in the video below, with 485 lbs. The ability to set this position with precision and accuracy depends on the equipment you're using: Some racks/benches have 1 inch spacings for this purpose, which is excellent and allows greater precision in safety placement, but most common racks have 2-3 inches between holes and thus people must often have the safeties a little lower than they'd ideally be. The main point is the proper use and purpose of safeties in the bench press is not really to catch a very rare catastrophic sudden drop onto your chest, but to allow you to survive the much more common situation of a normal failed rep. Could they theoretically save your life in such a situation where you drop it? Yes, they might. They won't stop the bar before it hits your chest but they might reduce the impact by stopping the bar from going further down and reducing the impact. This may or may not save your life in this rare catastrophic drop situation - it's good to have them there, set up anyway, but it's far from a sure bet. The most important things you can do are to learn and practice good technique, which involves stiff wrists in a very slightly bent back position, and thumbs around the barbell - NO SUICIDE GRIP. The safeties won't catch the bar and stop it from hitting your chest, so it's best to reduce the chances of dropping the bar on your chest from almost zero to even closer to almost zero. I've been bench pressing regularly for well over 20 years, always put my thumbs around the bar, and have never dropped it on myself. Nor has anyone I have coached to the best of my memory, over tens of thousands of sets and hundreds of thousands of reps. I have used safeties to successfully avoid getting trapped under the bar after a failed rep. In the video below, I tweaked my pec while pushing through a rep at 485 and had to set the bar on the pins to avoid getting trapped under it. This kind of situation is the primary use for the safeties. It's good to have them set up regardless - they might indeed save you if you somehow still manage to drop the bar, but they also very well might not.

Deep Squats, Shallow Thoughts

922,414 次观看 • 7 个月前

After more than a decade in the public spotlight, and three assassination attempts on her husband in two years, Melania Trump has had enough. In a blistering post Monday on the social media platform X, the first lady nailed ABC “comedian” Jimmy Kimmel for his classless attacks on President Donald Trump and his family. And she demanded ABC do something about it. Melania referred to it only as a “monologue,” but her post was pretty clearly a response to a joke Kimmel made Thursday on “Jimmy Kimmel Live!”, in which he referred to the first lady as an “expectant widow” — two days before a murderous gunman attacked the White House Correspondents’ Dinner in Washington while both Trumps were inside. And there was truth in every line of her post: “Kimmel’s hateful and violent rhetoric is intended to divide our country. His monologue about my family isn’t comedy — his words are corrosive and [deepen] the political sickness within America,” she wrote. “People like Kimmel shouldn’t have the opportunity to enter our homes each evening to spread hate. “A coward, Kimmel hides behind ABC because he knows the network will keep running cover to protect him. “Enough is enough. It is time for ABC to take a stand. How many times will ABC’s leadership enable Kimmel’s atrocious behavior at the expense of our community?” Kimmel’s material is more about feeding the liberal superiority complex than it is about being funny. The fact that he still has a show at all is more a testament to the nauseatingly liberal bias of American media than any quality of the entertainment he provides. And if anything, “coward” is too kind a term for a man who casts potshots at the president while protected by his own celebrity, the kind of man who would lie to his benighted audience about matters like the assassination of conservative activist Charlie Kirk, and then lie — tearfully — about his own lying. As to Melania’s demand that ABC do something about Kimmel? Smart money wouldn’t be betting on that happening anytime soon. As a symbol of the “resistance” to all things Trump, Kimmel enjoys a spiteful popularity that’s independent of any actual humor he’s still capable of. Long the No. 2 man in ratings for late-night shows, Kimmel is seen in the industry as poised to move into the No. 1 spot once the equally distasteful (and equally Trump-hating) Stephen Colbert leaves CBS at the end of May. ABC has already proven it has no problem allowing Kimmel to pollute American airwaves and politics in pursuit of profit — and Kimmel still makes a profit for the network, according to Fox Business senior correspondent and New York Post columnist Charles Gasparino. But for millions of Americans, sickened by the likes of Kimmel and Co., and their unrelenting attacks on a president supported by more than 77 million voters, the first lady’s post on Monday was a welcome turn. The American left will undoubtely ignore the post — or celebrate it in some sickening fashion. But the sane parts of the country will understand the point. Melania Trump has had enough. Conservative Americans have, too.

The Western Journal

68,762 次观看 • 2 个月前

“There is a tension between what the users of a currency want – and the users of a currency tend to like freedom, autonomy, and discretion as to what they spent their money on – and what the issuers of a currency want; and bluntly, the issuers of a currency want control. Control of monetary policy, and control of you.” The Bank of England’s consultation papers make very clear the level of control that they wish to exercise over you, and over your supposed financial autonomy, if you were to use their #DigitalPound. (1) You’ll need to provide ID in order to use the #DigitalPound: “For the digital pound, tiered access would allow for different levels of user access and functionality based on the amount of identification (ID) a user is willing or able to provide.” (2) The Bank will dictate how much you can hold: “The Bank would place some limits on holdings of digital pounds, at least during its introductory period.” (3) The digital pound will be programmable, if not by the Bank itself then by third party providers: “Programmability, delivered by Payment Interface Providers, could also enable the use of smart contracts, which carry out specific actions based on pre-defined terms and conditions.” Quotes are from from the Bank of England’s Digital Pound consultation paper: Whatever the #DigitalPound will be, it won’t be cash. Cash does not require me to show ID to use it. I can hold as much cash as I want or need. And, along with #Bitcoin, cash is a bearer instrument whose title is freely transferrable upon delivery, which is very difficult for a central bank to control. And long may it stay this way. A huge shout out and thank you to Lyn Alden, who made this point much more eloquently than I did in her excellent book #BrokenMoney. Thank you! Also I’m aware that my hand gestures in this clip are reminiscent of Richard Hendricks manipulating ‘datas’ on stage at TechCrunch Disrupt in #SiliconValley, and for this I can only apologize: #BitcoinConference #Amsterdam #NoToCBDCs

Freddie New

13,158 次观看 • 2 年前

🚀 Introducing EgoExo Forge - built on top of Rerun, Gradio, and Hugging Face hub (I’ll be in San Francisco July 21–29 — if you’re into robotics, egocentric AI, large-scale data collection, or just want to chat, DM me!) In my opinion, large-scale, diverse, and high-quality data is still the largest bottleneck for generalized robotics deployment. I believe that some version of imitation learning from human examples will be the most scalable + clean way to train humanoid robots 🤖 (similar to what Tesla did for Full Self Driving). Teleop is too expensive to collect a large enough dataset in a reasonable manner, so passive collection via egocentric (and in certain cases, exocentric) views feels like the right bet. Over the past few months, I've been trying to build out the scaffolding for this and using Rerun as my underlying infrastructure. Data being collected needs to be easily inspectable + time series and rerun provides the right tooling for this. My goal is to first build out a ground truth representative dataset from already existing open source data, generate some reasonable baselines, and then go out and collect my own data that adheres to the defined schema. 🔍 Starting with open-source datasets 1. EgoDex from Apple 2. HOCap from Nvidia and the University of Texas at Dallas 3. Assembly101 from Meta All these different datasets have different sensor configurations + annotations, so my goal with egoexo-forge is to have one consistent labeling scheme + data layout. I built a data pipeline that aligns all of the different datasets in one general schema assuming the COCO133 keypoint layout that allows for exo+ego, ego only, or exo only Since the scaffolding is already there, it becomes MUCH easier to add other datasets. So the next ones that I'll be including are HD-EPIC kitchens dataset, HOT3D, and finally my own personal iPhone + insta360 go collection method. Once I have a diverse variety of datasets, I'll double down on what I believe to be the key algorithms required to make useful data for imitation learning 📊 1. Camera Pose estimation via SLAM/SFM for ego perspective (and automatic calibration for exo) 2. Human pose estimation for both egocentric + exocentric views 3. Metric 3D reconstruction + object tracking I'll be setting up reasonable open-source baselines for each of these to validate that these datasets work, and then finally try to use the generated datasets for some imitation learning via the pi0-lerobot repo I've been working on. I plan on making a blog post + providing more info on all of this in the near future so stay tuned

Pablo Vela

32,085 次观看 • 1 年前