WEBVTT

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everything seems to be going 3d lately 3d movies the nintendo 3ds and oculus

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rift are all recent examples but 3d technology has been around for a while

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so how does it work first you need to understand how the brain is able to see

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3d objects in the first place because your two eyes have some distance between

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them each eye sees a slightly different view of the world objects which are

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closer to you appear to be in different positions when compared to things that

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are further away this is called parallax and it's the basis for how all 3d

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technology works these two slightly different views are then combined

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together in the brain's visual cortex to form a mental 3d image so 3d technology

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simply has to trick the brain into thinking that something is 3d when it's

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really not this is accomplished by presenting two slightly different images

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to each of your two eyes there are several ways to do this first up

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stereograms this is how those old view master 3d toys worked each eye simply

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looks directly at a different image which are so close to your face that you

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can't help but focus one eye on each of them oculus rift also works this way

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with each eye seeing a slightly different image but you don't even need

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a special device to make this work you can just place the two images side by

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side like this hilarious picture of beardless teran from 2006. all you need

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to do is cross your eyes to match up the images this is very similar to how magic

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eye images work for this single image stereogram instead of crossing your eyes

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you make them more parallel same concept different eye placement this one is a

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shark some people can't seem to make these kind of images work though how

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about just putting on a pair of glasses these red and cyan tinted glasses are

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used for anaglyph 3d you've probably seen this before the two different

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pictures are converted into red and cyan and then merged together to create a

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sort of bluish reddish image that looks weird until you put on the glasses with

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these glasses the cyan lines can only see the red image and the red lines can

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only see the cyan image this method is really simple and it doesn't need

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anything special to work aside from the cheap glasses however because color is

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used to distinguish between the two images the actual perceived colors of

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the final image don't look very good our next 3d method is called active shutter

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you wear these active shutter glasses which block light to each of your eyes

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alternatively in sync with the screen so when the screen displays an image

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intended for your right eye the glasses block the left eye from seeing anything

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and vice versa this is done 120 times

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per second so that each eye is able to see 60 frames per second it's done so

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rapidly that you're unable to tell that anything is even happening in theory

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anyway in practice the flickering is noticeable and many people get headaches

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from playing 3d games and watching 3d movies in this manner also active

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shutter glasses are not cheap that's why the more popular option today is the

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reald 3d system it uses a very special

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kind of polarization to work polarization has to do with the

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orientation of a wave of light light waves traveling through a linear

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polarized filter will all oscillate in the same direction but using special

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fancy technology a movie theater can project light waves that are circularly

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polarized with entire images being either clockwise or counterclockwise

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polarized your eyes don't notice anything but these glasses only allow

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for clockwise polarized light into the right eye and counterclockwise polarized

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light into the left eye voila 3d but

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what if you don't want to have to wear glasses at all lenticular 3d is a very

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clever method that doesn't require glasses you've probably seen these

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before but have no idea how they work a lenticular lens is placed on top of two

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or more interlaced images which will only show each of these images from

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different viewing angles close up it looks something like this this method is

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pretty cool it's used in printed media a lot and not just for 3d effects it can

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also be used for simple animation or to morph one image into another and last

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but not least we have the parallax barrier this method is used most notably

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by the nintendo 3ds which uses two

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overlapping lcd screens for its 3d effect the primary lcd screen on top

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displays two interlaced images while a secondary lcd screen placed between the

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primary screen and the backlight blocks the outgoing light with thin vertical

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strips it's the viewing angle that determines which of the two images is

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visible while there are others these are the most common 3d methods in use today

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speaking of simulating 3d look there's two of us now maybe if you stare long

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enough we'll turn 3d no alright then hit the road i'll handle

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this myself this my friends is the bucket of complaints about the last ad

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that we did for dollar shave club so today's explanation of how dollar shave

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door once a month and saves you money by charging less than brand name razors

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that means instead of choosing between worn out razors that do a crummy job and

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great shave with a fresh blade every week there that's all there is to it so

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ask yourself this for a moment do i buy razors

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do i overspend so that big brands can buy super bowl ads instead of supporting

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a business that charges a fair price for their product and uses their smaller

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marketing budget to support creators like youtube whose work i really enjoy

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if either of those things sounded bang on

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for you then head over to dollarshaveclub.com

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what do you have to lose other than some unwanted hair

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guys like this episode as fast as possible if you liked it dislike it if

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you disliked it and you want taryn to cry tonight

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and leave a comment telling us your favorite 3d experience if any was it

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avatar is it the 3ds is it when you take

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the glasses off and put them in the bin because you've got such a splitting headache love to hear from you guys

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thanks again for watching and as always don't forget to subscribe to techwiki

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