I've acquired a new superpower • Hacker News Board

Re: I've acquired a new superpower

#131

Post by wruza » Fri, Jan 10, 2025, 6:04 PM UTC

jasonjmcghee wrote: post #94

alt227 wrote: post #28

Earlier quoted context omitted.

I find that there are different techniques to seeing both. If I stare at the image and cross my eyes until focus lock I get crossview where the image goes back into the page. If I bring the image right up to my eyes and stare through it into the distance, then slowly move the image backwards into my gaze until I get focus lock, then I get parallel view where the image pops out of the page. I have always wondered the…

I had never done the parallel view before either- spent 5 or so minutes at it and finally got it. For me it's still takes a fair amount of effort to maintain it (unlike cross view that takes effort to stop seeing it instead) but the 3d looks way more impressive somehow. Like the Toronto crowd one- hadn't seen so much depth in a "magic eye" before

I believe it’s better because it is more natural to eyes. You may also want to play with the perspective. E.g. the hall here looks much better from 0.4m than up close on my phone due to the picture’s perspective. https://triaxes.com/docs/3DTheory-en/522ParallelCrosseyedvie...

Re: I've acquired a new superpower

#132

Post by alfiedotwtf » Fri, Jan 10, 2025, 6:05 PM UTC

This is also how I used to do Magic Eye images when I was a kid. Although the stereoscopic image was inverted on the z axis, it was a lot easier than to cross eyes by looking further out into the distance

Re: I've acquired a new superpower

#133

Post by PaulHoule » Fri, Jan 10, 2025, 6:07 PM UTC

mhitza wrote: post #118

PaulHoule wrote: post #105

Earlier quoted context omitted.

It's like https://triaxes.com/docs/3DTheory-en/522ParallelCrosseyedvie... which some people struggle with, somebody posted a https://en.wikipedia.org/wiki/Autostereogram to HN yesterday which some people get and others don't. (That's different from the "cross-eyed stereogram" because one of them involves having two images and the other one has one image with two images hidden in it)

I can understand why it's hard for some. I've landed on that wiki page a while ago and couldn't figure it out. Then found a similar thing on an itch.io page that was easier for me to figure out. In these later examples (starting with the easy puzzle of the OP, and your 3d examples), I find that I do the process in two stages. Unfocus my sight until the third image shows up in the middle at the correct size (as a blur…

What's more a lot of people (maybe 20%) don't benefit from things like

https://www.reald.com/

which is one reason why stereo movies have struggled. (That plus some people get sick... Having both a flat and 3-d movie in two different theaters comes across as money grubbing to the consumer but it is really a money sink to the theater.)

Re: I've acquired a new superpower

#134

Post by unkulunkulu » Fri, Jan 10, 2025, 6:07 PM UTC

Hah, old trick, I read pull requests this way for years

Re: I've acquired a new superpower

#135

Post by phailhaus » Fri, Jan 10, 2025, 6:09 PM UTC

nemetroid wrote: post #47

phailhaus wrote: post #26

Earlier quoted context omitted.

For spot-the-difference, crossing your eyes is more effective and easier to "dial in" than uncrossing them. You're essentially making each eye look at the opposite image. If you try uncrossing, then you need to make sure the images are at the exact correct distance to cause them to overlap with that technique, because you can only uncross your eyes enough to look straight ahead.

Looking uncrossed at the images in the article on my phone, I can easily achieve the effect uninterrupted between fully stretched arms and about half that.

Sure, but that's the limit. I didn't say it was impossible, just that crossing your eyes basically works all the way up to your nose.

Re: I've acquired a new superpower

#136

Post by mncharity » Fri, Jan 10, 2025, 6:09 PM UTC

codazoda wrote: post #48

Weird timing. I dunno why this works but I've been using it to see mice. You see, I noticed that I have a mouse problem in my garage. I figure if I've seen one mouse, there are probably more. So, I stood on some stairs in my garage and crossed my eyes to sort of blur the scene. It allowed me to catch movement more quickly and I was quickly watching multiple mice run around the edges of the area.

Hmm. I noticed in lectures, if I stilled my eyes, most of the field of view would grey out, except for areas of motion (eg a lecturer's head or writing arm) which appeared normal. After motion stopped in an area, it would slowly grey out. When a motion started, its area would snap to normal, making it easy to spot onsets of motion. Eventually my eyes would twitch, and the whole field would refresh.

Re: I've acquired a new superpower

#137

Post by throw7 » Fri, Jan 10, 2025, 6:10 PM UTC

I always feel like I'll permanently see cross eyed if I keep doing that. It doesn't help that I was accidentally hit in the head by my double's partner racket in tennis and spent like a minute or two walking around seeing double. Not fun.

Re: I've acquired a new superpower

#138

Post by belowm » Fri, Jan 10, 2025, 6:11 PM UTC

After a short period of training, I got to the point where I can see the third image which I can focus on. However, the differences are very subtile and don't stick out at all :/

Re: I've acquired a new superpower

#139

Post by knallfrosch » Fri, Jan 10, 2025, 6:11 PM UTC

jeffbee wrote: post #112

etaioinshrdlu wrote: post #12

Who's been doing this since they we're maybe 7 years old :)

I figured everyone because I had a puzzle book that instructed readers to do this.

We've had these stereoscopic books with hidden images and I never saw any. So I've been failing at this since 7 years old – does that count?

Re: I've acquired a new superpower

#140

Post by breadsniffer » Fri, Jan 10, 2025, 6:11 PM UTC

Wow. That’s insane! With the trick I can somehow solve them all!