Do you wear glasses when watching a 3D movie in cinema?

General Forums Off-topic Chat
1

The movie Avatar will be showed in 3D.

The question is what kind of technology they are using. Is it those glasses that are red and green. If it is. Have they done some improvement since the 80s?
I don’t even know the technical term of that kind technology.

And do you get a pair in the cinemas that you can use at home?

Thanks in advance.

2

The last 3D movies that I saw, Coraline and Up, used polarized lenses instead of Red/Green. The advantage is that color fidelity is maintained. The polarization technique cannot presently be used for DVD distribution for home TVs so there they use colored lenses.

The lenses are big enough to fit over normal vision glasses. The theater cleans and sanitizes the glasses between showings here. I think that you may be able to buy your own set of polarized lenses on the internet.

3

The thing about 3d glasses is that they are very annoying to wear. I was at universal studios this summer and watched this shrek 4D clip. Not 3D but 4D, you didn’t need any glasses the characters came out of the screen without you wearing anything. If they plan on keep making 3D movies that pop out of the screen I think they have to get that technology being used at universal. May be expensive, but I rather watch a movie without glasses than with. Just annoying…

4

@jrboddie1

Thanks for the information. I thought it was those old glasses made out of paper.

@Meriabo

Strange to call it 4D. A name more suitable would be 3.1D…If a newer technology will come then they can call it 3D NT. Then 3D XP. Then 3D Vista and so on :D.

I think I read somewhere that they will make movies at 120 frames per second.

5

When I saw Up I got to keep the glasses. They have plastic frames and seem well-made in general. Pretty nifty for looking at clouds and windshields and anything else that looks interesting in polarized light.

6

How can that work without the glasses? Is it some sort of concave mirror (so therefore each eye, being at a different position in space would receive a different image due to the concavity of the screen)

Movies won’t ever go above 60 frames per second, that’s the limit of what your eyes can see. Anything over 60 fps is wasteful.

Is there a reliable indicator as to what type of glasses the theaters are using? I can’t stand the red/cyan crap. I’ve heard people throwing around terms like RealD, dolby3d, etc. Do these names have any relevance to what kind of glasses will be used?

7

I read here. http://news.ecoustics.com/bbs/messages/10381/595129.html

Someone said that 240 fps shown on a flat surface would trick your mind that it’s “real” and that you’re thinking that you’re watching through a window.

8

I think that in The making of… of Monsters vs Aliens on the DVD they said they used 140fps, but that was 70 fps per camera.

9

I don’t think I’ll be watching Avatar at the cinemas - most likely at home. Not sure what the DVD will be like, but I’d presume we’d have a choice of 3d or normal. I will watch “normal”.

10

You got to seperate Polarized 3D and Shutter 3D for that FPS discussion as well as the footage FPS and the projection/display FPS.
I am currently working on a 3D short for a filmstudio in real3D. For the presentation they will use 3D Vision which is nvidias shutter Technologie.

The movie in PAL still is in 25fps, while it is displayed in 120Hz (120FPS)

Its a matter of feeding the eye information.

I think everyone knows how shutter 3D works, for those who dont, in a nutshell, the display shows the left-eye and right-eye image alternately and the shuttergoggles black out one of the eye. If you do that with less then 60Hz per eye you get dizzy, some get a headache and even nausea. So 2 Eyes á 60Hz results in 120Hz minimum for the L/R alternation.
The movie itself is still in 25Hz meaning you see each frame of the movie 4.8 times (120/25) 2.4 times for each eye (60/25).

Polarized 3D on the other hand works, as the name says with polarized light, one lens of the projectors is horizontal the other vertical polarized, same for the glasses, its basically the same as shutter, you are only able to see one image with one eye a time, advantage over shutter is, you dont loose “50% of brightness” because it does not black out one eye. Also polarized goggles are cheap crap, as they dont need any synchronisation or any electricity at all :wink:
The projectors though are insanely expensive and polarized LCD´s are not really mainstream stuff yet.

And Anaglyph3D was Red/Green in the Stoneage, nowadays its Red/Blue well Red/Cyan to be correct.

And tbh nvidias 3D Vision isnt really that good, atm it lacks native openGL support, does not work on quadroFX cards and for gaming it eats too much performance (need double FPS), darkens the image and goes not well with post rasterization effects, so its neither awesome for work, nor gaming.

11

The basic technologies used for 3D glasses:

  1. Circular polarized filters for left/right eyes.
    Advantage: Glasses are cheap, some places may let you keep them as souvenirs
    Disadvantage: Requires an aluminized screen, rather than the standard beaded glass screen.
  2. LCD shutter filters for left/right eyes.
    Advantage: The theater can use a standard screen
    Disadvantage: Active stuff in the glasses makes them expensive and heavy
  3. Narrowband dichroic filters for left/right eyes. The left and right filters pass a different wavelength of red(ish), green(ish), blue(ish) light to each eye. Dolby Labs is licensing this technology.
    Advantage: The theater cn use a standard screen
    Disadvantage: The dichroic filters are expensive – currently around $50.00 per pair of glasses.

See http://www.cnet.com.au/dolby-stakes-its-claim-in-3d-movie-tech-339282656.htm