Click here for a 768×768 image of the above thumbnail.
Click here for an 1800×1800 image of the above thumbnail.
Click here for a 768×768 image of the above thumbnail.
Click here for an 1800×1800 image of the above thumbnail.
Click here for a 768×768 image of the above thumbnail.
Click here for an 1800×1800 image of the above thumbnail.
View the images with red/cyan glasses (red on the left).
This demonstrates the phenomenon of an opaque sphere and a transparent sphere (the top and middle images), with the same deviation, looking “perfectly spherical”.
Both of those spheres have very close to 3% deviation, which is just a bit less than the “optimum” of 3.3% (40 deg FOV), so view these spheres with something close to 35 to 40 deg field of view (did I mention I hate math? 
for “optimum viewing” of these images (one or the other won’t matter a huge amount.
If you create the transparent sphere (the bottom image) with “twice as much deviation” (i.e. close to 6 to 6.6% deviation), assuming that it needs to be “twice as deep”, it will simply demonstrate “excessive deviation”.
6.6% deviation, BTW, is getting very close to “stereoscopic failure” (inability to stereoscopically fuse the imagery), as you can see in this demo.
0% deviation is “totally flat” (no stereoscopic image)
3.3% deviation is “optimum” (exactly in the middle of the range)
6.6% deviation is the “upper limit” (very close to stereoscopic failure)
Deviation is a “constant” factor in stereoscopy.
— I’m getting a few comments coming in about this and some people are reporting that they are not having any problems “looking at” the bottom sphere.
Are people who are *not* having problems fusing the
bottom sphere looking at it with the “proper FOV” of something close
to 38 deg (or so)? Just the sphere, now… don’t include the white
space around it.
If I stand back a couple of feet farther away from my monitor than
that, I have much less of a problem (I know, that seems weird, too, as
that should actually exaggerate the z-axis).
Close to 38 deg (or so), it’s “no cigar” for me… a very confusing,
“difficult to view” image. My wife said the exact same thing as I
did… and I made sure she saw it with “close to” a 38 deg FOV.
I’ve been viewing stereo 3D for years, and when I get up around 7%
deviation with a 40 deg FOV, my eyes literally “hurt” when I try to
look at the image. 10% dev (40 deg FOV) and it’s hopeless for me… I
absolutely cannot do it without severe pain.
Things People Say