everything seems to be going 3d lately 3d movies the nintendo 3ds and oculus
rift are all recent examples but 3d technology has been around for a while
so how does it work first you need to understand how the brain is able to see
3d objects in the first place because your two eyes have some distance between
them each eye sees a slightly different view of the world objects which are
closer to you appear to be in different positions when compared to things that
are further away this is called parallax and it's the basis for how all 3d
technology works these two slightly different views are then combined
together in the brain's visual cortex to form a mental 3d image so 3d technology
simply has to trick the brain into thinking that something is 3d when it's
really not this is accomplished by presenting two slightly different images
to each of your two eyes there are several ways to do this first up
stereograms this is how those old view master 3d toys worked each eye simply
looks directly at a different image which are so close to your face that you
can't help but focus one eye on each of them oculus rift also works this way
with each eye seeing a slightly different image but you don't even need
a special device to make this work you can just place the two images side by
side like this hilarious picture of beardless teran from 2006. all you need
to do is cross your eyes to match up the images this is very similar to how magic
eye images work for this single image stereogram instead of crossing your eyes
you make them more parallel same concept different eye placement this one is a
shark some people can't seem to make these kind of images work though how
about just putting on a pair of glasses these red and cyan tinted glasses are
used for anaglyph 3d you've probably seen this before the two different
pictures are converted into red and cyan and then merged together to create a
sort of bluish reddish image that looks weird until you put on the glasses with
these glasses the cyan lines can only see the red image and the red lines can
only see the cyan image this method is really simple and it doesn't need
anything special to work aside from the cheap glasses however because color is
used to distinguish between the two images the actual perceived colors of
the final image don't look very good our next 3d method is called active shutter
you wear these active shutter glasses which block light to each of your eyes
alternatively in sync with the screen so when the screen displays an image
intended for your right eye the glasses block the left eye from seeing anything
and vice versa this is done 120 times
per second so that each eye is able to see 60 frames per second it's done so
rapidly that you're unable to tell that anything is even happening in theory
anyway in practice the flickering is noticeable and many people get headaches
from playing 3d games and watching 3d movies in this manner also active
shutter glasses are not cheap that's why the more popular option today is the
reald 3d system it uses a very special
kind of polarization to work polarization has to do with the
orientation of a wave of light light waves traveling through a linear
polarized filter will all oscillate in the same direction but using special
fancy technology a movie theater can project light waves that are circularly
polarized with entire images being either clockwise or counterclockwise
polarized your eyes don't notice anything but these glasses only allow
for clockwise polarized light into the right eye and counterclockwise polarized
light into the left eye voila 3d but
what if you don't want to have to wear glasses at all lenticular 3d is a very
clever method that doesn't require glasses you've probably seen these
before but have no idea how they work a lenticular lens is placed on top of two
or more interlaced images which will only show each of these images from
different viewing angles close up it looks something like this this method is
pretty cool it's used in printed media a lot and not just for 3d effects it can
also be used for simple animation or to morph one image into another and last
but not least we have the parallax barrier this method is used most notably
by the nintendo 3ds which uses two
overlapping lcd screens for its 3d effect the primary lcd screen on top
displays two interlaced images while a secondary lcd screen placed between the
primary screen and the backlight blocks the outgoing light with thin vertical
strips it's the viewing angle that determines which of the two images is
visible while there are others these are the most common 3d methods in use today
speaking of simulating 3d look there's two of us now maybe if you stare long
enough we'll turn 3d no alright then hit the road i'll handle
this myself this my friends is the bucket of complaints about the last ad
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ask yourself this for a moment do i buy razors
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what do you have to lose other than some unwanted hair
guys like this episode as fast as possible if you liked it dislike it if
you disliked it and you want taryn to cry tonight
and leave a comment telling us your favorite 3d experience if any was it
avatar is it the 3ds is it when you take
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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