Sunday, 7 April 2013

Guest post: Stereoscopy (The Illusion of Depth)

Hello there, and nice to meet you! I'm Cass, a British schoolgirl and wannabe scientist from my little corner of the blogosphere, Undercover Dress-Up Lover. Though faceless, I really am mostly harmless, except whilst practising violin or playing video games, when I make a lot of horrible noises you would probably rather not hear. While the lovely Annika is occupied with all the trials and tribulations of moving house, I'm going to do my best to provide you a crash course in stereoscopy, the illusion of depth.

Grab a ruler and get in front of a mirror and measure how far apart your eyeballs are. Are you getting about 6 or 7cm between your pupils? This means each eye sees everything from slightly different angles to each other. Your brain is rather good at correlating these two images, one from each eye, to help you judge how far away things are from you.

3D films use stereoscopy - creating the illusion of depth - by simultaneously displaying two images which are polarised differently. The two lenses of the 3D glasses you wear are also polarised, so lets in one image into your left eye, and another into your right eye.

What's polarisation? Visible light is a transverse wave, so it can be polarised. The particles in a polarised wave vibrate only in one plane. Below is an unpolarised wave on the left travelling right, going trough a polarising filter, and coming out polarised.
So the light wave particles of one image of the film are vibrating in one certain direction, and one lens of the glasses only allow waves polarised in that plane through. This is also how those 'anaglyph' red and blue glasses work, except they filter by wavelength (different wavelengths are different colours) and aren't as good as polaroids because polaroids allow you to see the film in proper colour.

Jumper: Bless x OXBOW
Skirt: River Island
Bangle: Chica Style

Black Milk's 3D ribs dress makes me laugh. The skeletal element is interesting anyway, but if you buy this dress, you get free glasses too!

From Fashionably Geek
Why not utilise every glorious dimension of space through what you wear? Pompoms and ruffly flowers that stand out from the fabric are quirky and interesting embellishments that add a whole new texture to an outfit. Or, try something with a 2D stereoscopic print that looks 3D, with the use of anaglyph glasses or otherwise...

|| Chloe T. || Chai M. || Emma E. ||

I hope you all enjoyed guest-poster Cass' post about Stereoscopy, and learnt something new! Make sure to check out her blog at Undercover Dress-Up Lover (Cass has also started incorporating science posts amongst fashion ones, and I'm pretty proud to say that I inspired that in a small way :D)
x Annika

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  1. Thats so interesting!!

    And that dress is awesome omgosh... :O The skeleton one! :O

  2. This was so interesting! I ave always wondered how 3D works!


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