Just spitballing but you’d have to align the desired shape somehow, perhaps with a singular value decomposition. Once its transform was normalized you could compare its shape, or perhaps its convex hull, with a database of banned shapes.

The problem is this is pretty easy to defeat (by adding extra sprues and spikes to the object, breaking it into two shapes, etc) and the more aggressive you get with the check the more you risk false positives.

An AI training set would involve creating a dataset of all the banned shapes, then generating tens of thousands of permutations of them however you believe people might try to trick it. Ultimately the AI would lock onto some small feature of the shape that scores it as positive, perhaps something trivial. That also leads to weird false positives. This also creates an arms race as people figure out what that feature is subvert it.

This problem is much harder in 3D than in 2D (currency). Since you can also cut, file, and glue shit that comes out of a 3D printer later I don’t think this is a solvable problem. Like most gun control measures in the USA it appears to be aesthetics.

You could also just aggressively go false positive all over the place and say “fuck the users”, with exceptions for cops. This is basically the USA’s approach to drones.

It’s annoying when the vacuum system has a small leak so, over that long road trip, the car is always slooooowly losing speed. It’s such a nightmare to diagnose, at least as a DIYer.

I would add Grist to that list for climate focused reporting.

That’s strange, trying a few permutations here and I can’t get it to break. But at any rate, here’s the content:

[embedded players for sound files]

About

Play the below sounds through your phone speaker and hold it next to a Gatekeeper Systems wheels to lock/unlock. Check me out on twitter @stoppingcart

How It Works

Most electronic shopping cart wheels listen for a 7.8 kHz signal from an underground wire to know when to lock and unlock. A management remote can send a different signal at 7.8 kHz to the wheel to unlock it. Since 7.8 kHz is in the audio range, you can use the parasitic EMF from your phone’s speaker to “transmit” a similar code by playing a crafted audio file. Link to my original DEFCON 29 Talk

Button to Download Audio Files

This is similar to the feeling I got a few days ago when I finally got to use the shopping cart wheel unlocker that’s been in the back of my mind since watching the Defcon talk about it. Instead of the misconfigured and disabled cart being a giant roadblock in the store I was able to take it and use it normally. Feels good.

https://www.begaydocrime.com/carts

WARNING: DO NOT PLAY SOUNDS ON THIS PAGE THROUGH HEADPHONES

Pretty happy with my Lemur Pro, 3.5 years in. I just replaced the battery, which was fairly painless. Also had to replace the wireless radio, which was as easy as popping in a new one. I wasn’t happy that it failed, but apparently that’s industry wide, not just these laptops. Replacement was like $35. Other than that I’ve only had cosmetic issues, like the System76 sticker came off, which I don’t care about.

When I worked in VFX it was mostly Scientific Linux. A few macs were around for concept artists using Photoshop, and editorial using a proprietary video codec with Final Cut. Most business folks (in vfx called “coordinators” and “producers”) used tools that were web-based and cross platform (for example, Autodesk Shotgrid, Confluence, and Jira). A lot of internal development is done in Python so no worries there, either.

In game dev unfortunately it’s exclusively Windows. If you bring up even using os.path.join, instead of hardcoding \\ into paths, devs who have never worked in another OS look at you like some sort of paranoid maniac.