Quote:
Originally Posted by carpetmojo
I wonder if - going by the opinions feelings expressed here and elsewhere I've seenand heard - our brains have a kind of filter......
Brain knows it isn't real, despite the attempt to make it appear so, so doesn't fully accept it ......
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Pretty much.
One of Ebert's rants points out that the reason some people have a problem with current 3d tech is that the eyes are focusing at a fixed distance while the brain is interpretting it as varying depths.
http://blogs.suntimes.com/ebert/2011/01/post_4.html
Quote:
But the deeper problem is that the audience must focus their eyes at the plane of the screen -- say it is 80 feet away. This is constant no matter what.
But their eyes must converge at perhaps 10 feet away, then 60 feet, then 120 feet, and so on, depending on what the illusion is. So 3D films require us to focus at one distance and converge at another. And 600 million years of evolution has never presented this problem before. All living things with eyes have always focussed and converged at the same point.
If we look at the salt shaker on the table, close to us, we focus at six feet and our eyeballs converge (tilt in) at six feet. Imagine the base of a triangle between your eyes and the apex of the triangle resting on the thing you are looking at. But then look out the window and you focus at sixty feet and converge also at sixty feet. That imaginary triangle has now "opened up" so that your lines of sight are almost -- almost -- parallel to each other.
We can do this. 3D films would not work if we couldn't. But it is like tapping your head and rubbing your stomach at the same time, difficult. So the "CPU" of our perceptual brain has to work extra hard, which is why after 20 minutes or so many people get headaches. They are doing something that 600 million years of evolution never prepared them for.
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