How does 3d work

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Instead of using different colors of light, these glasses use different polarizations. Polarized light is forced to move in only one direction. When you watch a RealD film, the left- and right-eye versions of each frame alternate at a rate of images per second. A filter in front of the projector switches the polarization of each alternating image to match the filter for either the right or left lens of the glasses. The result is the same as with the red and blue glasses, but with more clarity.

But all that eye activity might cause headaches for some. Many viewers complain of nausea and discomfort, and there are enough 3D-dissenters to warrant the invention of glasses to cancel out the 3D effect. But movie goers still buy expensive tickets in droves because 3D movies, through their visual trickery, help the public escape to fantasy worlds more effectively.

That primal feeling results from the parts of the brain activated by viewing 3D movies. When watching flat movies, Yang says, we rely on visual cues to interpret the depth of the image. Danielalicea May 2, May 9, Caden Apr 5, Apr 5, Cool stuff, huh? Thanks for checking this one out!

Elise May 31, Why do they call regular movies 2d instead of 1d? Jun 1, I play Minecraft which is a game with 3D graphics. I like your videos I posted 2 of my own videos thank you for teaching me and my class mates.

Thanks for commenting, emry! Oct 12, Brandon Ta Oct 1, I hate 3D glasses because I have to put them over my thick glasses. Is there some sort of contact lens 3D glasses? Oct 4, Kendra w. Jun 25, This is very interesting I love 3D movies. I think you guys should do more wonders about animals though.

Kevin McMurtrie Jun 24, Jun 24, Have fun, lala! Nancy H. But I love regular movies. Tionna Pearson Jun 24, Thank for giving me the imformation. I just love watching 3D movies. Cody Jan 11, Great wonder I love ur website it is the best how do you get all this ideas? Jan 12, Cole H Jun 24, I knew 3D was some kind of trick they do with your eyes For me, 3D movies make me give headaches, so i have only seen a few.

I didn't know a lot about 3D but i did know it looked cool but i learned that detectors use two cameras to mimic the human eye to you can get that 3D effect.

Kristopher Feb 12, When I go to a movie that's 3d I do feel like I am in the movie things do pop in your face one time some one was stuck on a island full of dinosaurs and the guy was being chase by a dinosaur that was a t-Rex movies that pop out are super cool.

Wonderopolis Feb 17, Isabella Feb 12, Dear wonderopilis, I love you blog and I love 3d movies. Dear wonderoplis, I love 3D I just thought people were advanced if they made 3D but it's pretty easy I think i will make one when i grow up. Wonderopolis Feb 12, Gwendalyn Feb 12, Dear wonderopilous, Hello how are you doing?

So before i go i have a question how do those 3d glasses work how do they make everything come at you? Makena M. Feb 12, Dear Wonderopolis, I really like this text it is awesome!! Do you have any more about 3-D movies or anything about Wonderopolis? Your friend, Makena M. Taylor Feb 10, Dear Wonderopoils, I love your blog it teaches me so much.

Wonderopolis Feb 10, Reed Johnson Nov 17, Wow I never thought that was how 3D works, many thanks Wonderopolis :. Wonderopolis Nov 17, Gwen H. Oct 14, I love 3D movies!

I feel as if I could reach out and grab everything. Do you like 3D movies, wonderopolis? Thank you for writing this wonder!!! Wonderopolis Oct 15, Jordy K. Mar 13, I used to have no depth perception, so I couldn't see 3D when I was little Wonderopolis Mar 13, Derek L.

Oct 24, I still don't get it, I get the glasses part with binocular vision but what about the screen? Is the rest from are mind? Or just the screen? Hey Wonderopolis, I have a question: Why was this wonder ? Hadn't the Wonders gone all the way to a thousand-something?? It shows 'Wonder-of-the-Day' Wonderopolis Oct 20, Wonderopolis Oct 25, I love Wonderopolis, so for my guess I think that it's about I love you guys! Wonderopolis Oct 19, Ella Oct 19, Hold one arm straight out in front of you with your thumb pointing up.

Close one eye and stare at your thumb. Now close the other eye. What do you see? As you close one eye and then the other, you should see your thumb appear to move slightly against the background. Grab a ball and ask a friend to toss it to you. Practice catching the ball a couple of times. Then, keep one eye closed and try to catch the ball. Do you notice how much harder it is to gauge distance and catch the ball?

Scientists have a fancy word for how your eyes and your brain work together to see in three dimensions. Stereoscopy is what modern 3D technology tries to duplicate. Basically, movies try to mimic the stereoscopic capabilities of human eyes and the hardest part for 3D movie makers is getting a camera to do the same thing so that they have the right images to send to your eyes via the movie screen.

To get a good 3D image, you have to have two versions of the same image filmed from the exact angle as your eyes would see it. To accomplish this, filmmakers use special film rigs that use two cameras bolted into position to mimic human eye position. The cameras used for shooting 3-D films have two lenses placed adjacent to each other, closely resembling a pair of human eyes.

Alternatively, movies shot using regular 2-D cameras can be converted to 3-D in post-production using special 2-D to 3-D conversion software.

But, say you portray a distant object by setting the lines of sight seven centimeters apart on screen for someone whose eyes are seven centimeters apart.

Since everyone has a different distance between their eyes and sees the screen from a different place, the image is somewhat wrong for everybody. As scientists, we trick your vision.

That tells us about the algorithms the brain uses to process visual input. My lab studies praying mantises. We give them 3-D glasses to fool their vision. Mantises strike at things they think are in range. Mantises may compute this vision differently than humans. This might help mantises find camouflaged prey.

Levi, D. Stereopsis and amblyopia: A mini-review. Vision Research, , 17— Nityananda, V. Current Biology, 28 4 , Every month, we choose one reader question and get an answer from a top neuroscientist. Always been curious about something? Disclaimer: BrainFacts.