Show HN: We put an iPhone on the front wheel of a car
blog.evilwindowdog.com
blog.evilwindowdog.com
Maybe this is a way to test those sea bands that I have that I think generally work. But now I do have motion sickness and felt it almost right away.
[0] is a good alternative.
[1]: I'm serious: https://en.wikipedia.org/wiki/AaaaaAAaaaAAAaaAAAAaAAAAA!!!_%...
Let me know, I'll be glad to help how I can.
https://www.youtube.com/watch?v=fLnd9ucUu9Y
Skip to 1:15 to see a textured reconstruction.
The first real-time example was Davison et al's MonoSLAM paper of 2007, I think.
(I'm really hoping for the same response that the Android guy got!)
One thing though - the tilting of the scene from the phone's perceived variance of the gravity vector is not due to centrifugal force, but due to inertia.
In other words, it's the same reason you're pushed back into your seat when you accelerate, and slam your head into the dashboard and spill hot coffee in your lap when you lock up the breaks.
The same problem existed. So it is not inertia in this case. However, inertia could also interfere with the gravity vector.
Could Horizon still create a stable-ish video out of that (where the position and rotation of the image are both changing rapidly), or does this require a relatively stable position to work this well?
(I have no particular dog in this hunt, I'm just curious.)
EDIT: I see that Kayou asked the same question, probably in a smarter way, here: https://news.ycombinator.com/item?id=7904992 but I don't see a response from petrakeas or stelabouras yet, so I'll keep my question here even if it is a little redundant.
So, if you put the iPhone on the outer part of the wheel you will most probably get a horizontal video that will end up showing your scene moving up-down, left-right.
Or you could go a different direction and attach a phone to a cat. I hear people love videos with cats ;)
Please do not do this unless you really know what you're messing with (and if you do then you won't).
On second thought, simply please do not do this. Spinning an iPhone up to 10K rpm or higher is a very bad idea, the label reads 11K rpm max, 850W, those things don't usually have soft-start so it'll just fire up and start throwing things.
Appeal to authority fallacy comes free of charge: I've had a pretty serious metal workshop and have seen several interesting interactions between angle-grinders and various objects in otherwise controlled circumstances, it is astounding how fast things can go wrong. Just having a grinder disc shatter on you can take you completely by surprise even if you know the danger, this is far more dangerous, it is Darwin award material.
Everyone innately knows certain things like "don't stick fingers in light socket" but other things aren't immediately obvious. Perhaps because you are juxtaposing something like an iphone and maybe are focused on the worse case scenario as being a destroyed iphone (in other words the money issue) instead of the iphone flying off into someones face.
I was watching an episode of "Property Brothers" (a typical renovate a house HGTV type show) and was amazed that they were having the owners participate in demolition without using practically any protective gear (while using crowbars and sledgehammers etc.)
I bet this was just for show.
Wait until you get a nice long steel nail that jumps away on you from the crowbar just as it exits the wood and embeds itself 2" deep in another piece of wood. if you're lucky.
Or when a sledge hits a really hard pebble just off the side of a solid wall and it gets catapulted out.
Sledges, crowbars and pickaxes are really dangerous tools and especially if you should wear goggles at a minimum, and probably a helmet too.
And, no, I'm not from the cradle to the grave coddling department.
From busting apart shipping crates as a kid I also realized that in addition to the goggles and helmet you also need boots that can take stepping on a stray nail as well. Not sneakers, definitely not sneakers.
(Personally I'd wear PPE with either type of equipment)
Really, I can't stress this enough, the kind of energy you can imbue a 4" nail with using a crowbar is something fierce.
Or maybe the crowbar would just fly up and split your head open. 4' of nice steel makes one hell of a spring.
Big angle grinders are actually safer than small ones... until the disks shatter, then you have a real surprise. Circular saws will do fun stuff as well every now and then, they just love it when they get pinched in the cut. So you have to plan how the material will warp before you start cutting otherwise it might cause the dangling part to squeeze shut the cut (when you want the opposite).
Chainsaw in your leg? Not good. Wear ballistic protective covering and you should be fine. The clutch in your saw won't like it one bit but should you ever need it you'll be very happy you spent that money, and a clutch is so much easier to replace than a leg.
With a grinder you want to wear safety classes, no gloves (so you can't get caught). For chainsaws there are as many opinions on safety as there are chainsaw wielders. Even the pros are surprised every now and then, usually not by the saw but by the tree.
The best advice I can give you for saws is don't use one with too little power and keep it sharp at all times (and that goes for all edged tools). Wear a helmet with a screen and ballistic gear (pants, jacket).
If you're super experienced then you can make up your own mind and you'll likely disagree with all of this :)
Anyway, circular saws: dad was cutting some pretty nice wood for a fence. Circular saw hit something in the wood, bounced up, then straight down onto his left hand thumb, severing it entirely.
He then drove to hospital. They reattached it, he was lucky enough to have Australia's best nerve surgeon on call at that hospital that day, and now he's got near 100% movement in it. Very very lucky.
Angler grinders blowing, now that's something that will put the fear of god into you...
I had an angle grinder disc blow on me last fall when cutting through a rooftile, that too was quite an interesting experience. It would have been less of a problem if it had shattered completely but of course one segment on one side decided to hang on. If not for eye protection that would have ended in the hospital for sure.
The one thing I've noticed is that if you rarely work with tools you are really at risk. Then as you work more more with powertools you get more experience, you become a bit more confident and more aware of the risks. That's good.
Then when you're working with them for a really long time two things will converge in a bad way: all that experience and confidence will lull you into a false sense of safety an then the law of large numbers catches up with you, very rare occurrences will happen to you because you are doing it so often.
If you're not paying attention right at that moment you could very well end up in hospital or worse.
I've noticed that that happens with many different things in a similar way.
You get confident, you slip up, you work faster, you make mistakes.
When you start out boating (with a new boat) you are oh so very careful.
Then you gain confidence and you start to take more chances. All the sudden things that you could never imagine yourself doing when you start you do. An example might be getting caught in an inlet with a boat during a period when larger boats are all trying to go in or out at the same time and you are tossed left and right.
Programming as well. Say doing a rm -fr foo * in stead of rm -fr foo* and not catching it because you hit return to fast instead of making sure the statement was correct. [1]
[1] I got into the habit of doing for i in foo* ; echo $i ; done and then inserting the rm -fr statement (by using uparrow) just as a precaution to slow me down.
I do the exact same thing only I use 'ls foo*' first, and when doing bulk updates / deletes with sql servers I again first do a select and then modify the select once I'm sure it will hit the right rows.
Edit: Camera is not centered on the iPhone. So if you center the camera it's worse than that. I would personally not stand anywhere near it.
Backing up, being safe with power tools is IMO more a mindset than a set of safety equipment. As such you need some understanding of the forces involved. Not, just to be safe right then but so you don't get lulled into a false concept of safety because the overblown worst case you picture did not happen.
PS: I am going to leave this alone. It's dangerous, but I do hope someone posts a video of this at some point.
I'd really hate to be hit with anything at 260 MPH, especially not with a phone. Those things are hard!
Yes, I always wear eye goggles with it.
Even so, don't use a grinder without the metal guard, and still try and keep your body parts out of the plane of its rotation.
Or maybe some safer things too - place it on a record on a turntable and film the face of the DJ doing some mixing?
Seems like strapping an iPhone to an angle grinder is getting close to answering the stated question...
Take a blender, remove the blades, put iPhones on the spindle where the blades were. Now fire up the blender and throw in some fruits. Will iPhones spinning at $whatever RPMs be able to turn your fruits and wheat grass into a delicious smoothie?
The original is actually "Will It Be Blended [by this blender]". I want to know "Will It Make a Suitable Replacement for a Blender".
Edit: I just think I should've googled that first.
[edit] I do wonder why we haven't seen more programmable cameras with the sensors a smartphone has.
"So what?" you mumble. "It's so subtle nobody cares."
Well, that's actually a big part of why VR failed when it was first introduced a couple decades ago, and why Carmack & Occulus are so successful with it now: they've analyzed the subtle nuances that you don't acknowledge but your brain processes & reacts to nonetheless. Horizon is applying the same attention to detail, and will produce a better product as a result (yes, I do notice those sub-frame distortions in various products almost daily, and would appreciate developers correcting them).
"We all know by now that Horizon shoots perfect horizontal videos, even if you rotate your device while shooting! We wanted to stress Horizon’s capabilities by using it under extreme circumstances."