3D perception

I get the feeling that many people dismiss 3D due to either not recognising or perhaps not percieving what it is that they're seeing, a lot seem to think automatically that 3D just means things pop out the screen and don't understand that there is depth behind the screen too even when it's presented to them. I have spoken to one person who says he doesn't see the difference between a 2D image and a 3D image with depth, however, I don't completely trust what he says as he does have a tendency to jump on one bandwagon or another and is firmly in the camp against 3D and when he put on a pair of passive 3D glasses he instantly started complaining 'my eyes, my eyes!' before he'd even looked at a 3D source so the glasses would have had no more effect than putting on a pair of weak sunglasses.


Anyway, back to the perception, I've noticed a couple of strange effects while working on and viewing stereoscopic images and it seems to be caused by how the brain is processing the information from the eyes.

The first, I'm sure everyone will have noticed is (particularly when viewing a still image or scene) when you move your head sideways it seems like objects that are static in the background or foreground slide around sideways too, this seems to be because your brain is being fooled into thinking it's looking at a 3D scene and is expecting the view to change as you move your head so to make sense of the view not changing the brain perceives it as the background or foreground objects must be moving.

The second thing I've noticed is from doing some stereo graphics programming, I had a cube spinning around in the foreground that I could position somewhere out in front (pop out) of the screen. Even though the actual size of the drawing of the cube on the screen didn't vary, depending on where I positioned the cube out from the screen I was percieving it to change in size, the further out from the screen and closer to my eyes the stereo position got, the smaller I perceived it to be even though it's size on the screen never actually changed.


Are there any other perceptual effects anyone else has noticed or anyone care to elaborate on those I've mentioned?

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