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Old 12-08-2020, 06:23 AM   #181
bavanut bavanut is offline
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I can tell you, my calculations suggest a rho value of 0.85465 for your screen size.

If you happen to sit one screen width away, the opening credits of the corrected 3-D Blu-ray will appear to come forward 11.9651 feet. They will appear about 2.0349 feet in front of you. At least, that's what the math says.

If my calculations are right, all this means a convergence angle (gamma) of 0.1048 radians, about 6 degrees. That's probably not too great an angle in the everyday world, but given that in a 3-D movie our eyes converge at one point and focus (accommodate) at another, I could imagine there are a great many people who might groan and complain when confronted with such an image. However, it's a safe bet that many such people wouldn't take the time to watch Friday the 13th Part III anyway, so it may be that they are naturally weeded out of any sample.

Last edited by bavanut; 12-08-2020 at 06:44 PM.
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Old 12-08-2020, 09:48 AM   #182
the13thman the13thman is offline
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Quote:
Originally Posted by bavanut View Post
With utmost respect to any and all moderators, there is definitely a distinction between ghosting and the difficulty (or impossibility) of fusing stereoscopic images. The latter is what we have in view here, in this portion of our conversation.
I don't disagree, and it is an interesting subject. But this being the 3D technology forum, lengthy discussions about fusing double images are better placed here rather than in movie threads.
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Old 12-08-2020, 03:36 PM   #183
Freakyguy666 Freakyguy666 is offline
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Quote:
Originally Posted by bavanut View Post
I can tell you, my calculations suggest a rho value of 0.85465 for your screen size.

If you happen to sit one screen width away, the opening credits of the corrected 3-D Blu-ray will appear to come forward 11.9651 feet. They will appear about 2.0349 feet in front of you. At least, that's what the math says.

If my calculations are right, all this means a convergence angle (gamma) of 0.1048 radians, about 6 degrees. That's probably not too great an angle in the everyday world, but given that in a 3-D movies our eyes converge at one point and focus (accommodate) at another, I could imagine there are a great many people who might groan and complain when confronted with such an image. However, it's a safe bet that many such people wouldn't take the time to watch Friday the 13th Part III anyway, so it may be that they are naturally weeded out of any sample.
I appreciate you taking the time.

I can tell you that Iíve had dozens of people to my home cinema to watch this scene and none has had an issue fusing the 2 images.

While I realize this may be anecdotal, I strongly feel that a revision to Dr. Hillís statement about the 80% is in order as mentioned in my prior post (i.e. add simultaneous positive parallax).

Lastly, if you ever get the time or inclination to measure ďthe snake sceneĒ I would bet that the math will result in an rho of greater than 90%, implying that perhaps the correct threshold is closer to 90% than Dr. Hillís 80%.

Thank you once again!
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Old 12-08-2020, 03:42 PM   #184
Freakyguy666 Freakyguy666 is offline
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Originally Posted by the13thman View Post
I don't disagree, and it is an interesting subject. But this being the 3D technology forum, lengthy discussions about fusing double images are better placed here rather than in movie threads.
I am ok with this correction.

That said, I think it would be nice if you would amend your post in the Friday the 13th 3D forum to let readers know that there is an interesting discussion specifically about the opening credits in this thread. I know that most would not bother to come to this thread unless they knew there was something here related to the movie and adding a few words to your post letting them know seems apt.
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Old 12-08-2020, 05:07 PM   #185
bavanut bavanut is offline
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Quote:
Originally Posted by the13thman View Post
I don't disagree, and it is an interesting subject. But this being the 3D technology forum, lengthy discussions about fusing double images are better placed here rather than in movie threads.
I understand and appreciate that. Thank you, 13th Man.

If I may offer a lighthearted observation, I recognize that math for some people is rather like kale, broccoli, or spinach. They know it's good for them, but the very sight of it makes them queasy. Better, then, that this discussion be brought here, where those most interested can seek it out deliberately.
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Old 12-08-2020, 06:18 PM   #186
bavanut bavanut is offline
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Quote:
Originally Posted by Freakyguy666 View Post
I appreciate you taking the time.

I can tell you that Iíve had dozens of people to my home cinema to watch this scene and none has had an issue fusing the 2 images.

While I realize this may be anecdotal, I strongly feel that a revision to Dr. Hillís statement about the 80% is in order as mentioned in my prior post (i.e. add simultaneous positive parallax).

Lastly, if you ever get the time or inclination to measure ďthe snake sceneĒ I would bet that the math will result in an rho of greater than 90%, implying that perhaps the correct threshold is closer to 90% than Dr. Hillís 80%.

Thank you once again!
My pleasure. I appreciate your interest and your excellent questions and observations.

I trust the general soundness of Dr. Hill's thinking, but you're right, it is interesting to consider that here we have a widely renowned pop-out effect that has met with hearty approval from many who have seen it, but which seems to go beyond Hill's viewing recommendations. (I am quite sure Spottiswoode would have disapproved as well, not to mention Rule, Norling, Samuel Kitrosser, and others.)

I am an acquaintance of an eye doctor active in the 3-D community. Perhaps I can ask him what the current thinking is on this sort of thing among optometrists and ophthalmologists. Dr. Hill's recommendations were designed to ensure comfortable viewing for as large a segment of the general public as possible, but they were based on research conducted in and before 1953.
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Old 01-24-2021, 05:49 PM   #187
tripletopper tripletopper is offline
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I heard a couple things.

I heard that if an external shutter 3D adapter can sense when the left and right eyes are actually shown, then if accurate and precise enough, it can attach to any TV and show correct L/R.? If so, since every TV that has timing issues has external sound outputs, and the sound is synced up with the video play time. Then wouldn't sending code through LR audio accurately tell a "universal shutter when the right time is?

Second, is it true that some newer modern TVs have sub microsecond ping time. Like OLED. can a 3d add on work like that?

If I tried to add 3D to my VGA monitor, Can any VGA to HDMI converter convey the 3D timing properly, or do I need a special HDMI to VGA adapter? Do I need to set it in a specific resolution / hertz rate?

The reason why I ask is because I found a external adapter that looks like a CRT singer that goes in between the monitor and the input.
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