First, some Frequently Asked Questions... just for the
newbies.
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What does 3D stereo mean?
'3D stereo' is the perception of 3D of video and
sound whereby the mind combines two seperately
sources provided to your left & right senses.
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How do I seperately provide left and right audio
signals to my ears?
Use a headphone. Phones covering the whole ear
is recommended.
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How do I seperately provide left and right video
signals to my eyes?
Options from low to high costs: Eyes-only,
Anaglyph-glasses, Shutter-glasses, VR-headset,
3D-display, Polaroid-glasses, Holography.
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Can I see 3D from a 2D picture?
Yep... just cross your eyes and practice looking
at a stereo-pair.
Keep a safe distance, try to relax your eyes and
focus.
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What are anaglyph-glasses?
Those fancy red/green or red/blue glasses. The
colors in the picture are blocked by the colors
of the glasses.
A drawback is that you can't correctly perceive
colors because the glasses have a color of their
own.
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What are shutter-glasses?
Glasses with LCS's (liquid crystal shutter) that
covers one eye at a time when displaying the
correct image.
Examples are the 3D Revelator by ELSA and the
cheap ASUS glasses (only works on ASUS videocards
ofcourse).
A drawback is that you need a high frequency and
brightness is cut into half.
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What is a VR-headset?
A Virtual Reality headset contains two seperate
displays/lenses.
The big advantage is that you have a wider view
and can rotate your head without losing sight.
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What is a 3D monitor?
It's a TFT screen with small vertical lens-strips
that focus on the lines dedicated for a specific
eye. The correction for the position shift is done
with a head-position tracker.
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What are polaroid-glasses?
If you perpendicularly polarize the light of two
beamers and view the projected image with
polaroid-glasses, each eye sees a different
image.
You'll need two projectors but with fairly-cheap
glasses you can let many people watch in color,
unlike with anaglyph-glasses.
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What is holography?
A virtual 3D image viewed from any point and not
wearing any special glasses.
A holograph has the image for all possible
angles. It can either be generated from a direct
source in real-time, stored into holographic
material or computer generated (which is the most
diffult ofcourse).
But this topic is actually out of the scope of
"3D stereo" since it doesn't product 2 specific
left & right images.
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How do I generate the 3D audio signals?
Assuming you're using a headphone it is
calculated with Head Related Transfer Functions
(HRTF), reflections, dampening, raytracing
etc...
HRTF is the difference in
frequency/time/amplitude between both ears.
Due to system limitations, we can't calculate
the air pressure & flow for each possible 3D
position, but we can ofcourse simulate it.
For games, we use DirectSound 3D, EAX, A3D
libraries to set up an environment, listener and
sound sources.
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How do I generate 3D video signals?
You can record it with two parallel cameras with
a eye-distance or generate it with the
computer.
Beware that CG scenes take up twice the amount
of time to render.
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Blaat?
Definately!
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Why?
Because sheep rule!
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Is this the last question?
NO... I just don't want to write them all down :P
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3D Stereo