Darren New <dne### [at] sanrrcom> wrote:
> My point being that even with both eyes open, looking at light projected on 
> a 2D flat movie screen, you still have a sense of depth. You know Bruce 
> Willis' car is closer than the bad guy's helicopter even if it's a flat 
> photo on a flat screen.

  But my point is that with one eye the depth perception will be much
stronger (which is something many people don't know).

  (Of course one could ask, why then don't we always watch movies and
play games with one eye only? It's actually a bit tiring to do that for
a long time. And somehow the picture just isn't as clear as with both
eyes. You can try it.)

-- 
                                                          - Warp

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On Mon, 30 Nov 2009 11:34:26 -0500, Warp wrote:

>   The lack of depth perception of people who are blind on one eye has
>   been
> greatly exaggerated. People with only one seeing eye have a surprisingly
> good depth perception.

It depends on how long they've been affected by it.  My dad had very poor 
peripheral vision and near the end of his life was almost completely 
blind in one eye - he had absolutely no depth perception at all 
(demonstrated to me several times when I tossed car keys to him and he 
could never tell how far away they were).

Those who are affected by such a condition for most of their life, 
though, have often adjusted to their circumstances.

Jim

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On 11/30/2009 6:01 PM, Darren New wrote:
> Contrast with a movie theatre where you wear special glasses, or with a
> play or puppet show.
>
> My point being that even with both eyes open, looking at light projected
> on a 2D flat movie screen, you still have a sense of depth. You know
> Bruce Willis' car is closer than the bad guy's helicopter even if it's a
> flat photo on a flat screen.

In both video games and movies you don't have to worry about keeping 
objects in focus. In film it's taken care of by the camera operator; in 
video games things are never out of focus. I'll admit that if we had 
perfect focus at all distances like a pinhole camera, then maybe we 
would have an easier time judging depth with just one eye, as there 
would be essentially no delay as our eyes focus.


--
Michael Horvath
mik### [at] gmailcom
http://isometricland.com

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Warp wrote:
>   *My* point was that if you start watching a 3D game (perspective, whatever
> you want to call it) like Doom or Half-Life with one eye only, you will
> start getting quite cool depth perception. Not many people know this because
> they have never tried.

OK, I'll give it a try.

>   *Your* point I missed completely.

That you have a degree of depth perception in a "3D game" like half-life 
even with both eyes open.

>   Rather than nitpicking about terminology, just try it. It's cool.

I wasn't really nit-picking about terminology. I was simply trying to 
explain what I was talking about. Namely, that you can easily judge depth in 
a game that only has one image, so you can easily judge depth with one eye 
open looking at the real world.

-- 
Darren New, San Diego CA, USA (PST)
   Human nature dictates that toothpaste tubes spend
   much longer being almost empty than almost full.

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Warp wrote:
>   But my point is that with one eye the depth perception will be much
> stronger (which is something many people don't know).

I didn't know that. I'll give it a try.

-- 
Darren New, San Diego CA, USA (PST)
   Human nature dictates that toothpaste tubes spend
   much longer being almost empty than almost full.

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"Warp" <war### [at] tagpovrayorg> wrote in message
news:4b1451f2@news.povray.org...
> Darren New <dne### [at] sanrrcom> wrote:
> > My point being that even with both eyes open, looking at light projected
on
> > a 2D flat movie screen, you still have a sense of depth. You know Bruce
> > Willis' car is closer than the bad guy's helicopter even if it's a flat
> > photo on a flat screen.
>
>   But my point is that with one eye the depth perception will be much
> stronger (which is something many people don't know).

It's not depth perception that's stronger with one eye (which would be
absurd). It's eactly the opposite: For best result watching a *flat* screen,
you do want to eliminate your own depth perception altogether. With two
eyes, you are noticing the actual 3D surface geometry of the screen itself
(especially if your eyes wander or your head is not still) plus a 2D surface
texture. With one eye only, your eye can more easily "replace" the camera
with which the movie was shot.

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somebody <x### [at] ycom> wrote:
> It's not depth perception that's stronger with one eye (which would be
> absurd).

  Watching a moving 3D scenery which has been projected onto a 2D plane
(such as a computer game or a movie) with one eye *does* give you a stronger
perception of depth than watching it with both eyes. If you don't believe
it, try it. (Give your brain about a minute to adapt.)

  It's not absurd. The brain is quite good at compensating for lack of
stereo vision.

-- 
                                                          - Warp

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SharkD <mik### [at] gmailcom> wrote:
> in video games things are never out of focus.

  You clearly haven't played any moder videogame. ;)

-- 
                                                          - Warp

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Jim Henderson <nos### [at] nospamcom> wrote:
> (demonstrated to me several times when I tossed car keys to him and he 
> could never tell how far away they were).

  The brain cannot adapt to such a small object making such a rapid movement
with one eye only. The visual clues are too subtle and too fast.

  Instead, put the keys on a table, and then walk from afar towards the
table with one eye covered, and take the keys. At least I don't have the
slightest problem in doing that. That's because the brain has time to
estimate the distance to the keys accurately while you are walking,
watching the keys.

-- 
                                                          - Warp

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Warp wrote:
> SharkD <mik### [at] gmailcom> wrote:
>> in video games things are never out of focus.
> 
>   You clearly haven't played any moder videogame. ;)

I am highly amused at the visual effects of Batman getting clubbed with a 
pipe, or how the screen goes all fuzzy while you're choking the crap out of 
someone. :-)

-- 
Darren New, San Diego CA, USA (PST)
   Human nature dictates that toothpaste tubes spend
   much longer being almost empty than almost full.

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