frame sequential or dual projector
Hi

I have seen the movie Avatar in two different 3D theatres.
One used a dual projector settup with polarizing filters.
The other used dolby3D with one projector.
Because the second one is with one projector it will generate a frame alternating for left and right eye. Just like with shutter glasses.

I noticed that the scenes with a lot of moving objects where more difficult for my eyes/brains in the second theatre.
Could it be that the fact that left and richt eyes gets the frame on a different moment that your brains do not
understand the pictures anymore when there is a moving object? The difference of the position of the object on your left and right eye will
determine the distance of the object, but this difference will be influenced when the object is moving because left and right eyes do not
display the picture at the same moment.

What is the experience of you folks?

And does anyone know if the right and left eye will get a frame corresponding to the same moment, or is each frame (left or right) generated
for a new moment in time?
Hi



I have seen the movie Avatar in two different 3D theatres.

One used a dual projector settup with polarizing filters.

The other used dolby3D with one projector.

Because the second one is with one projector it will generate a frame alternating for left and right eye. Just like with shutter glasses.



I noticed that the scenes with a lot of moving objects where more difficult for my eyes/brains in the second theatre.

Could it be that the fact that left and richt eyes gets the frame on a different moment that your brains do not

understand the pictures anymore when there is a moving object? The difference of the position of the object on your left and right eye will

determine the distance of the object, but this difference will be influenced when the object is moving because left and right eyes do not

display the picture at the same moment.



What is the experience of you folks?



And does anyone know if the right and left eye will get a frame corresponding to the same moment, or is each frame (left or right) generated

for a new moment in time?

#1
Posted 01/01/2010 11:34 AM   
The phenomenon you noticed at the cinema also happens with consumer stereo 3D products like the nvidie geforce 3D vision glasses.
It depends on the speed of the object and the refresh rate.

This phenonmenon is also mentionned by some reviewers of the press who mentionned they were loosing the 3D effect when a scene started to move too quickly, and I noticed it too when playing FPS games.
In games, the left and right eye images are generated for the exact same time. This is a mandatory techical limitation of 3D game engines and the nvidia 3D driver, if this limitation was not used, if your display runs at 120Hz, the games would be required to run constantly at 120fps, which is impossible for most recent games. If the framerate were to drop below 120fps you'd get constant eye inversion (understand massive flicker) all the time which detroys completely the 3D effect and produces massive headaches.
In order to avoid this phenomenon, the games render the left and right eye at the same time only at 60Hz, which allows the game framerate and the display refresh rate to be different.
The phenomenon you noticed at the cinema also happens with consumer stereo 3D products like the nvidie geforce 3D vision glasses.

It depends on the speed of the object and the refresh rate.



This phenonmenon is also mentionned by some reviewers of the press who mentionned they were loosing the 3D effect when a scene started to move too quickly, and I noticed it too when playing FPS games.

In games, the left and right eye images are generated for the exact same time. This is a mandatory techical limitation of 3D game engines and the nvidia 3D driver, if this limitation was not used, if your display runs at 120Hz, the games would be required to run constantly at 120fps, which is impossible for most recent games. If the framerate were to drop below 120fps you'd get constant eye inversion (understand massive flicker) all the time which detroys completely the 3D effect and produces massive headaches.

In order to avoid this phenomenon, the games render the left and right eye at the same time only at 60Hz, which allows the game framerate and the display refresh rate to be different.

Passive 3D forever
110" DIY dual-projection system
2x Epson EH-TW3500 (1080p) + Linear Polarizers (SPAR)
XtremScreen Daylight 2.0
VNS Geobox501 signal converter

#2
Posted 01/01/2010 01:30 PM   
[quote name='BlackSharkfr' post='973670' date='Jan 1 2010, 02:30 PM']The phenomenon you noticed at the cinema also happens with consumer stereo 3D products like the nvidie geforce 3D vision glasses.
It depends on the speed of the object and the refresh rate.

This phenonmenon is also mentionned by some reviewers of the press who mentionned they were loosing the 3D effect when a scene started to move too quickly, and I noticed it too when playing FPS games.
In games, the left and right eye images are generated for the exact same time. This is a mandatory techical limitation of 3D game engines and the nvidia 3D driver, if this limitation was not used, if your display runs at 120Hz, the games would be required to run constantly at 120fps, which is impossible for most recent games. If the framerate were to drop below 120fps you'd get constant eye inversion (understand massive flicker) all the time which detroys completely the 3D effect and produces massive headaches.
In order to avoid this phenomenon, the games render the left and right eye at the same time only at 60Hz, which allows the game framerate and the display refresh rate to be different.[/quote]

Thanks for the clear answer.
Do you know if there is a name of this 'phenomenon'? (So that I can Google on it).
Do you think that this 'phenomenon'will dissapear if generating the complete frames at 120fps alternating for left and right eyes?
I can imagine that the information that your brains get from left and right eye is still confusing. It may depend on how the eye information is processed in your brains.
[quote name='BlackSharkfr' post='973670' date='Jan 1 2010, 02:30 PM']The phenomenon you noticed at the cinema also happens with consumer stereo 3D products like the nvidie geforce 3D vision glasses.

It depends on the speed of the object and the refresh rate.



This phenonmenon is also mentionned by some reviewers of the press who mentionned they were loosing the 3D effect when a scene started to move too quickly, and I noticed it too when playing FPS games.

In games, the left and right eye images are generated for the exact same time. This is a mandatory techical limitation of 3D game engines and the nvidia 3D driver, if this limitation was not used, if your display runs at 120Hz, the games would be required to run constantly at 120fps, which is impossible for most recent games. If the framerate were to drop below 120fps you'd get constant eye inversion (understand massive flicker) all the time which detroys completely the 3D effect and produces massive headaches.

In order to avoid this phenomenon, the games render the left and right eye at the same time only at 60Hz, which allows the game framerate and the display refresh rate to be different.



Thanks for the clear answer.

Do you know if there is a name of this 'phenomenon'? (So that I can Google on it).

Do you think that this 'phenomenon'will dissapear if generating the complete frames at 120fps alternating for left and right eyes?

I can imagine that the information that your brains get from left and right eye is still confusing. It may depend on how the eye information is processed in your brains.

#3
Posted 01/01/2010 03:10 PM   
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