Promised my kid "Spy Kids 3D" this weekend and have a question:

[blondeatlast]

Can you see the 3D if blind in one eye (as I am)? Will it look "weird" if I can't see the 3D?

Blindness is from diabetic retinopathy, fwiw.

Thanks.

[lazarus]

1. no and yes

Actually, I've heard it's horrid, completely betrays the first two films.

The 3d effect comes from colour, and you need both. It'll look odd without, I imagine.

[blondeatlast]

6. Kinda what I expected, but I can't talk him out of it without losing my

hair. Loved both the previous ones, actually. We periodically watch them again.

[Archae]

2. My older sister can't see 3D stuff like that.

She got a stick into one eye, blinding it decades ago.

So if she tries to watch a TV show or movie, that uses 3-D glasses like most 3-D stuff does, it doesn't work with her.

[dawgman]

7. doesn't work for me either.

Can't see out of my left eye at all (well I have peripheral, but no forward) and have always been frustrated by 3-D.

[MissMarple]

3. I've had Lasix on old eyes and it still works.

I use reading glasses for small print, and 3D still works for me at the IMAX.

[Occulus]

4. I saw a film

at Disney World when I was twelve; it was a 3D film, but... and this was the amazing part to me.... it did NOT use the red/blue glasses; the glasses were clear, and the images on the screen were offset from each other ala the red/blue 3D we all know.

Thing is, it looked much better than the 3D we all usually see. Anyone know what I'm talking about?

[blondeatlast]

I remember the Captain Eo (Michael Jackson); was that it?

Cause I saw that post blindness and I did get the 3D effect.

[ianbruce]

9. Polarized light...

Two projected images who'd light is polorized at 90° with respect to each other. The glasses contain opposite polorization so each eye sees a different image -- the left and right channels required for stereo vision.

[Devils Advocate NZ]

11. I can explain it all for you, it's quite simple...

We see in 3D because we have two eyes offset from each other that give a slightly diferent view of objects in the real world. A simple demonstration for those people with eyesight in both eyes is to look at an object fairly nearby, and close one eye, then while opening that eye, close the other. You will see that the object appears to jump side to side, and that each eye will reveal more of one side of the object than the other.

So 3D systems work by feeding a different image in to each eye. With the coloured glasses version, the image on the screen is ghosted in two seperate colour palattes, one being red shifted, and the other being blue shifted. The "lenses" of the glasses use a blue or red filter so that only one of the ghosted images will be seen by the eye on that side.

For people sighted in only one eye, wearing the glasses will still filter the image destined for the blind eye, but due to the image not being recombined in the brain, will appear to be tinted in the colour of the lens over the sighted eye.

The version of 3D you are refering to is the latest and best system. It works by doubling the frame rate of the movies (say from 30 fps to 60 fps) but interleaving the images destined for the left eye and right eye sequentially. The glasses therefore do not need to be tinted, but instead must block the eye from seeing the frames meant for the other eye. It does this by using glass that can be polarised according to an electrical signal.

When a frame destined for the right eye is displayed on screen, the lens over the left eye blacks out, blocking the left eye from seing the screen. When the next frame is displayed, this time destined for the left eye, the lens over the right eye blacks out, blocking the right eye from seeing the screen.

This process happens so fast, that the brain essentially sees two seperate movies being fed into each eye, and thus creating a 3D image.

For people blind in one eye, you don't see in 3D even in the real world, so you will not see in 3D at 3D movies.

[blondeatlast]

16. Great explanation, thanks, but one more question . . .

"For people blind in one eye, you don't see in 3D even in the real world, so you will not see in 3D at 3D movies."

I lost the sight in my left 6 years ago, and I don't notice a loss of 3D perception in the "real" world. I assume that the 3 in 3D is depth perception; I seem to still have that (except I have a real problem with it at night with oncoming traffic, etc.).

For instance, I reach for the pen on my desk. I know just how far out to put my arm. Is my braing compensating somehow?

The lack of 3D perception makes complete sense on paper, but I don't think I have lost it, which I suppose is some sort of compensation. Is is physiological, emotional, or intellectual?

Didn't mean to make this an A&P class, but it is rather fascinating.

[Astarho]

17. Are you completely blind in one eye?

Or just partially? I'm blind in one eye but have some peripheral vision.

The further away something is the less depth perception matters. If it's an object three hundred feet away both eyes would get pretty much the same image, as oppsed to the clock on the wall ten feet away.

As for the pen, I would say the brain is compensating, remmebering how far away it is. I can reach for the mouse next to the computer without looking at all. 3D perception isn't just by the eyes, but other things as well like light and shadow for instance. Like drawing a sketch of a ball or a cube that looks three dimentional.

Just my thoughts and experiances on the subject.

[blondeatlast]

18. Makes sense to me--thanks. BTW,

just got back from the movie and wasn't really able to get the 3D effect, but it didn't really matter. First of all, kid and neighbor kid are happy! Second, the actors seem to have been mostly filmed with a regular camera. Only the special effects were 3D.

But what was really interesting is that seeing through the blue lens, given the video game theme, lended something to it, IMHO. It did
lend a more somber mood.

For those who care, the first two are much better. And I was the only one in the theater who got the Corinthian leather joke.

I'm old, but, oh well . . .

[Must_B_Free]

19. I loved that one

there were a few times I found myself laughing out loud.

I just got back and I loved the movie. I was way in front though, so I thought the 3D didn't have any space for my mind to put it together, either that or the skewed apect of it ruined the far away stuff. I got them to give me two tickets to come back and see it again. This time I'll sit farther back.

[Champion Jack]

12. Yup

It's the polarizing system, the "red-blue" (actually it's red/cyan)
one is the anaglyph process.

[Enraged_Ape]

15. The clear glasses are actually polarized

The images are projected with a polarity of 90 degrees to each other (I don't know how they do that part), but since each lens of the glasses also polarized at right angles, your eyes end up seeing two different, stereoscopic images.

The beauty of this technique is that it doesn't sacrifice color.

[ianbruce]

5. Sorry no...

Your brain perceives 3D as a result the fusion of two sightly offset images. There are many other stereo cues besides parallax, but like stereo sound, it takes two to tango.

[blondeatlast]

8. Thanks--I just wanted to know what to expect.

It'll probably look "weird," too, right?

[ianbruce]

10. As long as you wear the glasses...

It should look no more weird than the world looks now. Without the glasses you'll see a blurry double image. Put on the glasses and the image will be filtered so that your good eye sees the single image channel meant for it.

[1monster]

13. With the glasses on, you should be able to see the film in the regular

two demension format. If you take the glasses off, it's gonna be unbearable. You'll see double of everything. It is nauseating. So, keep the glasses on even if you can't see in 3-D.

[leftyandproud]

14. well

You can enjoy the movie, though it will be a little blurry...You will see the same scenes as everyone else but you won't be doing the "WOAH!!" thing as objects blast out of the screen..as I'm sure the rest of the audience will be doing.