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A Quick 3D Primer

Blu-ray 3D On The PC: The Tom's Hardware Review
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(The following primer is copied from our recent article Wall-Sized 3D Gaming, Just like The Theaters Do It. If you've read that, feel free to continue on to the next page.)

A human being's ability to perceive the third dimension is primarily achieved by our binocular (stereoscopic) vision. Put simply, we can see in 3D because we have two eyes. Each of our eyes sees the world from a slightly different perspective, and our brain combines these perspectives to give us a sense of how close or far an object is. Because there are two separate perspectives, this is commonly referred to as stereoscopic vision.

An easy way to demonstrate stereoscopic vision is with a quick exercise (best performed when you're not looking in the direction of a PC monitor). Close your left eye and put your right hand about four inches in front of your right eye. Wiggle your hand a little. Now, open both eyes and do the same thing, with one hand in front of your right eye. You will experience a big difference in your sense of depth and the position of your hand in 3D space. When both of your eyes are providing an alternate perspective, your brain is able to put together that rich sense of relative placement and provide an accurate indication of how far your hand actually is from your face. If you stop moving your hand and close each eye alternatively, you will notice that each eye provides a different view of where your hand sits in your field of vision.

The key to a 3D display, then, is to provide each eye with an alternate view of the same scene. As you can imagine, in the theater or on TV, this is a bit of a challenge since there is only one screen at which to look. How does a 3D display provide a separate image for each eye?

Surprisingly, there are a number of ways to achieve this goal, and one involves the use of old-school anaglyph red-and-blue colored glasses. When it comes to LCD computer monitors and TVs, 120 Hz alternate-frame sequencing is the technology that the TV industry and Nvidia are investing heavily in promoting. Alternate-frame sequencing is being groomed as the de-facto standard of full-resolution 3D home displays for the foreseeable future.

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  • 0 Hide
    mi1ez , 20 May 2010 18:11
    how do shuttered glasses cope with input lag? if you were running through a TV, how would it cope with all the back end processing lag?
  • 0 Hide
    aje21 , 20 May 2010 19:19
    How soon before DVB-T3D? We're just seeing the first signs of the need to replace Freeview with Freeview HD, and I bet that once that's been done they'll say "now you need Freeview 3D".
    Good to see that media PCs with a modest CPU/GPU combo are up to the job.
  • 0 Hide
    mi1ez , 20 May 2010 20:30
    Oh yes! 50% UK coverage of DVB-T2 for the world cup! boxes and cards are imminent!
  • 0 Hide
    Alatheia00 , 21 May 2010 05:14
    @ mi1ez

    When you say the cards are imminent can you tell me where i can get one?
    This would be a really cool additive to my already disgusting pc. Also, I am assuming you guys are from England who do think the best online etailer is?, I think the cheapest is pricelover then ebuyer then tekheads in that order. Come on England our best chance for a long time, easy group stage players can chillax and then we will be fresh for the later stages and all of this is wonderous 1080p. All my friends are slow to adopt the sky hd package as it is around £70 a month for decent channels not including setup fees but when I saw my brother in laws setup on his samsung 8 series it was absolutely astonishing especially the nature documentary we happenend to be watching wether i could justify spending £820+ £60 setup fee a year is a different matter and these cards would be the ideal trade off as you can always sell it after the world cup, mind you the olympics is around the corner but they will have laser 3d out by then, which is the technology to watch.
  • -2 Hide
    irish_adam , 21 May 2010 07:20
    I'm sorry but £D is years off of market penetration. How long was it before HD took off? it hasnt yet, I know no one with a stand alone blu-ray player and i know no one that wants to buy one or cough up more for blu-ray DVDs. So what if its only a meagre upgrade for PC enthusiasts to watch 3D? until it starts becoming main stream it really isn't going to catch on. Shutter glasses also are not the way forward, families will have to fight over the sweet spot of the TV to watch a 3D film

    All i hear about Nvidias 3D vision is that the glasses weight a ton and they make you want to puke. You'll forgive me if i dont spend a penny on 3D until it atleast progresses to the point that its viable
  • 2 Hide
    cleeve , 21 May 2010 08:47
    irish_adamAll i hear about Nvidias 3D vision is that the glasses weight a ton and they make you want to puke. You'll forgive me if i dont spend a penny on 3D until it atleast progresses to the point that its viable


    As far as forgiveness, sure, I forgive you.

    But weighing a ton and making you want to puke? Read the review. Six people watched a 2-hour movie, and nobody reported a headache or a desire to throw up. The only comments were that the glasses were lighter than they looked, that it appeared crystal clear, and that the 3D effect was well done.

    These aren't the 3D glasses of 4 years ago. But I'm probably wasting my breath with information, It sounds like you've already decided what the things are like before trying them out. :) 
  • 0 Hide
    Anonymous , 21 May 2010 14:28
    I sorry bring this up People like me who have sigth problems these silly glasses won't mean thing. I already wear glasses 3D looks great but if tech can't make possble for 30% of people thats hug mistake. I can't wear contact lens or sun glasses.

    Lets hope ati/amd can fix this since green crew screw up.
  • 0 Hide
    mi1ez , 21 May 2010 17:53
    Quote:
    @ mi1ez

    When you say the cards are imminent can you tell me where i can get one?
    This would be a really cool additive to my already disgusting pc. Also, I am assuming you guys are from England who do think the best online etailer is?, I think the cheapest is pricelover then ebuyer then tekheads in that order. Come on England our best chance for a long time, easy group stage players can chillax and then we will be fresh for the later stages and all of this is wonderous 1080p. All my friends are slow to adopt the sky hd package as it is around £70 a month for decent channels not including setup fees but when I saw my brother in laws setup on his samsung 8 series it was absolutely astonishing especially the nature documentary we happenend to be watching wether i could justify spending £820+ £60 setup fee a year is a different matter and these cards would be the ideal trade off as you can always sell it after the world cup, mind you the olympics is around the corner but they will have laser 3d out by then, which is the technology to watch.

    Well, freeview HD is already being broadcast, although I have yet to see any actual hardware. Apparently there's only 1 supplier of the decoder silicon at the moment so they could be quite expensive. The plan is to have STBs available in time for the world cup. How long after PC hardware will be I don't know.
  • 0 Hide
    memeroot , 21 May 2010 19:08
    I have 3d vision but no br drive... hope there are downloads... I'm sure there will be soon.
  • 0 Hide
    memeroot , 21 May 2010 19:12
    so a i5 750 with 9800 gx2 should be ok?
  • 0 Hide
    irish_adam , 21 May 2010 20:05
    CleeveAs far as forgiveness, sure, I forgive you.But weighing a ton and making you want to puke? Read the review. Six people watched a 2-hour movie, and nobody reported a headache or a desire to throw up. The only comments were that the glasses were lighter than they looked, that it appeared crystal clear, and that the 3D effect was well done.These aren't the 3D glasses of 4 years ago. But I'm probably wasting my breath with information, It sounds like you've already decided what the things are like before trying them out.


    I tried Nvidias shutter glasses a couple of years ago at a demo in a store, most people there reported headaches but that was playing games not with movies so maybe that is what made the difference. My main concern is how restricted you are with shutter glasses and how people are unwilling to invest in the technology. it will probably be 5 to 10 years before 3D kicks off so i'll just adapt the wait and see because who knows what will happen in that time and even if shutter glasses survive
  • 0 Hide
    Ko0lHaNDLuKe , 21 May 2010 20:20
    When do ATI bring out their own version of 3D for HD cards? I want 3D from my 5850!
  • -2 Hide
    will_chellam , 24 May 2010 03:14
    I really don't see the point of this article....

    It starts of with the costs of $800+ for supplying your family and a couple of friends with the glasses to watch a film.....

    ....sat around a 23" acer monitor....

    yay, sounds like a great night in.

    As far as I can tell, the more advanced home cinema becomes, the less relevant it is to the computer market. There is absolutely no point in making all of that investment for a 'cinema' experience on a pc monitor.

    Home cinema needs to be done in a lounge, with a big screen with distance between you and it - one of the joys of cinema is the scale because of the basic physics of being able to focus on something a reasonable distance away and the bio-feedback from you eye muscles, doing it on a small screen at close distance will never emulate that.

    I'm holding off on my home cinema until I can do it properly - in a big room, with controlled lighting and callibrated picture settings, and a properly callibrated audio setup.
  • 0 Hide
    cleeve , 26 May 2010 04:18
    irish_adamI tried Nvidias shutter glasses a couple of years ago at a demo in a store, most people there reported headaches but that was playing games not with movies so maybe that is what made the difference.


    The difference was probably that it wasn't 120 Hz, as the 120 Hz solution hasn't been available for a couple years. 3D Vision has only been here4 since 2009, what you've likely experienced is a 60 Hz solution, and they really suck in comparison.

    irish_adamMy main concern is how restricted you are with shutter glasses and how people are unwilling to invest in the technology. it will probably be 5 to 10 years before 3D kicks off so i'll just adapt the wait and see because who knows what will happen in that time and even if shutter glasses survive


    I didn't find the glasses restrictive at all. Having said that I've never said everybody should run out and buy this stuff as soon as it's released, it's wayy to expensive for multiple glasses.

    However, early adopters who are willing to pay the premium will enjoy the tech I think, and the prices will inevitably drop like a rock over the next couple years. Remember how much the first blu-ray players were on release? It wasn't that long ago.

    I'm saying, in 2 or 3 years this stuff will be quite viable from a consumer standpoint. But I'm not suggesting everyone goes out and pays $750 for glasses for a family of 5 right now.
  • 1 Hide
    cleeve , 26 May 2010 04:24
    will_chellamI really don't see the point of this article....It starts of with the costs of $800+ for supplying your family and a couple of friends with the glasses to watch a film.........sat around a 23" acer monitor


    You're right, you don't see the point of this article.

    This article isn't about convincing you, or anyone else, to go out and buy Blu-ray 3D for the PC as fast as you can. This article isn't about watching a 24" screen with your family. If that's what you got out of it, you're missing the point entirely.

    The point is that the Blu-ray 3D tech looks good and it is viable, it's not the headache-dizzying experience of old. It has a lot of potential.

    Early adopters are always going to pay whatever it takes, but what you should be getting out of this if you're not an early adopter is that in a couple of years when the price goes down this is something that can potentially bring the 3D theatre experience to your home if you're interested in that. You should also understand that it's an option for HTPC owners, not just folks with commercial Blu-ray 3D set-top players.


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    sbuckler , 28 May 2010 19:23
    mi1ezOh yes! 50% UK coverage of DVB-T2 for the world cup! boxes and cards are imminent!

    Don't know about sky, but all freesat boxes can do both 3D and HD - it was designed into the specification. You don't need a new sat box, although obviously you will need a new tv.
    I would have thought the same will be true of any freeview HD box you buy.
  • 0 Hide
    mi1ez , 28 June 2010 16:51
    reported
  • 0 Hide
    mi1ez , 28 June 2010 16:53
    Quote:
    Don't know about sky, but all freesat boxes can do both 3D and HD - it was designed into the specification. You don't need a new sat box, although obviously you will need a new tv.
    I would have thought the same will be true of any freeview HD box you buy.

    Sadly it needs different hardware. bare in mind freeview's been around about 12 years now (inc ITVdigital and ONdigital)!