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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 views • 5 months ago •via X (Twitter)

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If you think this is just another silly demo made with AI, read this post. You might change your mind, because this demo is about MATH. What you see on the screen is not a render from Blender (obviously, it’s not that good). It’s a three.js app built with Toolcraft. Available on the web and rendered in real time(link in the comments). But Blender still has a lot to do with it. Blender has Geometry Nodes - a powerful node-based system for creating and manipulating procedural geometry. In other words, it’s math. And math is a universal language. And who do you think is pretty good at math? >>> AI. Now you can download or buy Blender files from marketplaces, and when they contain Geometry Nodes for procedural animations, objects, surfaces, or effects, you can transfer that logic to the web. Make it real-time, make it interactive. Materials are a separate story, of course. They can still suck unless you use the right tricks: PBR, HDRIs, material blending, displacement, and faked surface relief. So why is Blender important here? Blender is open source, and many tools around it are open source too. An AI trained on their code. That means it can translate the math from one environment to another quite accurately. If you’ve been struggling to reproduce some idea with AI that you had in your head or seen in some references, and it has something to do with Geometry Nodes, and you can find that idea or a close one in the Blender ecosystem - it means you can transfer it to the web. Thank me later.

Alex Barashkov

28,090 views • 22 days ago

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

924,757 views • 8 months ago