MathBox: Cross-eyed 3D | Hacker News Reader

MathBox: Cross-eyed 3D

acko.net

35 pointsEzGraphs24 comments

That worked amazingly well. (I've had it happen to me accidentally before when looking at a tiled ceiling or floor.)

As amazing as it is, I hope it doesn't spread, because hours spent staring at movies or games like this would be disastrous to kids' developing eyes and visual systems.

Why would it be disastrous?

Anecdotally, as a kid, I remember having a book containing cross-eyed stereographic images. As far as I'm aware, today, my eyesight is normal.

Hmm. I see nothing but the instructions and a white screen on Chromium 25.0.1364.160-0ubuntu0.12.10.1 and Firefox 20.0 (both running in Ubuntu 12.10 32bit).

Same here, nothing happened. Firefox 20, Chromium 26.0.1410.43 (189671) and Opera 12.15 (build 1748). All on Linux.

Yes, its' not working in Chrome for linux ( 27.0.1453.12 dev), check it in Windows

In Chrome, go to about:gpu, and look for the line: WebGL: Hardware accelerated

If you don't see that, then WebGL isn't enabled for you, probably due to a blacklisted card/driver. That's the most likely cause.

Not sure if this applies to you but I had to refresh the page before I realized the first slide is just blank and images appear on successive slides.

I just see three flat blurry doodads. I assume the center one is supposed to look like it's sticking out of the screen?

The Nintendo 3DS didn't work for me, either, so maybe I'm just broken. Likewise for '80s stuff like Rad Racer (red/green glasses).

Between 1-5% of the population doesn't have stereo-vision (I'm one of them, maybe so are you). The most common reason is that the eyes were misaligned when we were children, so the brain learned to use only one of them at a time.

http://en.wikipedia.org/wiki/Amblyopia#Strabismic_amblyopia

I played around with something similar in order to create a camera setup for WebGL/Three.js and the Occulus Rift: http://sxp.me/rift/ This was created before my Rift was delivered so I used cross-eyed 3D rather than the proper 3D the Rift uses. The camera setup is general enough that it can probably be applied to any Three.js scene that allows offscreen rendering.

It took me a while to get it to snap in, but once saw it I couldn't look away. Now my eyes hurt. But damn, that was cool.

The corkscrew is from acko.net's excellent article http://acko.net/blog/how-to-fold-a-julia-fractal/ I highly recommend checking it out if you haven't already.

I would love if this had an option to switch left-right images for those of us who have an easier time with "focus-beyond-the-screen" 3D rather than cross-eyed.

^This. I'd rather not have to flip my screen upside-down, thank you very much. Fortunately the transitions between slides allow you to get a good sense of the 3D. But I don't see any instructions whatsoever.

Couldn't you automate the effect by rapidly switching between the two images? I guess that would basically be traditional 3D.

JS would probably be too slow.

No, because 3D works by showing a different image to each eye. What you propose would show both images to both eyes, and you would get the same thing as when you look at current 3D displays without the proper 3D glasses; the two images pasted over each other.

Add shutter glasses and a way to sync them up with the switching images and it should work though.

No. That kind of 3D requires the viewer to wear active glasses that are synchronized with the rapid switching between the images. When the image for the left eye is displayed, the right lens of the glasses turns opaque, and vise versa, such that each eye only sees the image intended for it, allowing for the stereoscopic effect.

Gotcha, thanks.

Works nicely with a 3D monitor. If anyone's wondering - the image on the right is for your left eye, and the image on the left is for your right eye.

Do you guys see sharp when crossing your eyes? With my eyes crossed I see everything very blurry, so I don't seen any intended effects. :(

It was blurry for me at first so I moved closer, and then it was sharp--but I had to cross my eyes at a pretty uncomfortable angle. Worth the pain though. :)

Fantastic stuff! Are there any more equally amazing or better examples of this?

That is beautiful

It hurts my eyes

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