Unrealistic depth - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 5 Old 12-21-2019, 10:24 PM - Thread Starter
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Question Unrealistic depth

On my 3D TV, why don't movies on 3D Blu-ray--my only source of stereoscopic 3D content--have realistic depth? Lately, I've noticed that they do not look as if I was there on scene, watching the action live. I moved my home theater system from a small room to a bigger (but still somewhat small) room, so my seat's distance from the TV has increased. To find out if that is the reason, I moved my chair closer to the screen, and I still don't see realistic depth. It is also possible that when I first got into stereoscopic 3D, my enthusiasm for it prevented me from seeing that it doesn't look realistic. The two movies that I watched recently and that made me feel like the effect isn't realistic were Avatar and The Amazing Spider-man.

TV: LG 47LW5700, AVR: Onkyo TX-NR787, speakers: DCM KX speakers:DCM KX-12 Series 2 (as front left and front right), DCM KX Center Series 2, DCM KX-6 Series 2 (as side surround left and right), sources: Xbox One S (with Kinect and Kinect for Windows adapter), Playstation 2 (fat model), Nintendo GameCube (model with digital AV output) with GameBoy Player, Panasonic VCR (PV-4661), PC: Microsoft Surface Pro (5th generation), phone: iPhone 7 Plus
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post #2 of 5 Old 12-21-2019, 10:58 PM - Thread Starter
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Maybe the realism of the depth is affected by the interaxial and convergence of the stereoscopic 3D movie cameras.

TV: LG 47LW5700, AVR: Onkyo TX-NR787, speakers: DCM KX speakers:DCM KX-12 Series 2 (as front left and front right), DCM KX Center Series 2, DCM KX-6 Series 2 (as side surround left and right), sources: Xbox One S (with Kinect and Kinect for Windows adapter), Playstation 2 (fat model), Nintendo GameCube (model with digital AV output) with GameBoy Player, Panasonic VCR (PV-4661), PC: Microsoft Surface Pro (5th generation), phone: iPhone 7 Plus
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post #3 of 5 Old 12-22-2019, 01:57 PM
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Quote:
Originally Posted by Drew Neilson View Post
On my 3D TV, why don't movies on 3D Blu-ray--my only source of stereoscopic 3D content--have realistic depth? Lately, I've noticed that they do not look as if I was there on scene, watching the action live. I moved my home theater system from a small room to a bigger (but still somewhat small) room, so my seat's distance from the TV has increased. To find out if that is the reason, I moved my chair closer to the screen, and I still don't see realistic depth. It is also possible that when I first got into stereoscopic 3D, my enthusiasm for it prevented me from seeing that it doesn't look realistic. The two movies that I watched recently and that made me feel like the effect isn't realistic were Avatar and The Amazing Spider-man.
Depth on any 3D TV under 70" is going to look artificial since the characters are not life-size looking. Both Avatar and Spiderman have good depth. Also, sitting closer to the screen actually decreases depth, versus farther away. Best depth is about twice the screen width. Since you are farther away, you should see more depth. But the objects being so small might not give you enough depth. Also, take off your glasses--your object at the most distance from the screen (infinity for example) should be about 2.5" apart to give good depth, and the object closest to the screen should look like it is almost even. Many 3D bluray players have a 3D adjustment that will allow you to get more depth, and also 3D TVs have a depth option. What player and TV do you have? I will look up the options for you if I can. There is one other issue--make sure the left and right eyes aren't reversed. It creates an odd looking image that cause a strange depth effect. Both players and 3DTVs have an option to switch eyes. A friend of mine watched many 3D movies in switched eye mode and didn't know. He said, he hated 3D until I set it straight for him...
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post #4 of 5 Old 05-05-2020, 04:02 PM - Thread Starter
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@3DBob I am thinking about new TVs and whether I should get a new TV, and I figured I should re-read your post since you said that bigger 3D TVs have more 3D depth than smaller 3D TVs. I hope that you can help me determine what size of TV will provide best depth. Obviously, most or all new TVs don't support 3D, so if I want 3D, then I'd either have to buy a 3D TV that is a few years old, or I'd have to buy some sort of adapter that, in the HDMI chain, goes between the TV and whatever is feeding that TV its signal. Currently, my HDMI chain is:

Xbox One S --> AV receiver --> TV

I think that I once saw online an adapter that takes the 3D signal, converts it to a 2D signal that switches from the left eye to the right eye every other frame, and syncs with active 3D glasses (passive glasses won't work)--allowing the viewer to view stereoscopic 3D on any TV. I haven't yet tried searching for that device or others like it; I'm not sure that I know what query words to use in my search.

I have several 3D Blu-rays and I'd hate to no longer be able to watch them in 3D.

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Depth on any 3D TV under 70" is going to look artificial since the characters are not life-size looking.
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the objects being so small might not give you enough depth.
My TV is 47".

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Originally Posted by 3DBob View Post
sitting closer to the screen actually decreases depth, versus farther away.
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Originally Posted by 3DBob View Post
Since you are farther away, you should see more depth.
Can you explain? I'd think that sitting closer would increase the depth due to the left and right images being further apart the closer that I sit.

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Best depth is about twice the screen width.
I assume that you mean that the best depth we observe in the left and right images after they've been combined by our brains is objects that are behind the screen at a distance of about twice the screen's width. However, when you refer to the screen's width, is that horizontal width or diagonal width?

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take off your glasses--your object at the most distance from the screen (infinity for example) should be about 2.5" apart to give good depth, and the object closest to the screen should look like it is almost even.
I just popped in The Amazing Spider-man and in the final scene, in the final moments before the credits start, there is a shot of Spider-man using his webbing to shoot himself out of scaffolding, and New York city's skyline is far behind the screen, in the distance. I focused on a particular light on that skyline--one which was one of the furthest away--and then took off my glasses and measured the distance between that light from the left eye image and that same light from the right eye image, and it was about half of an inch--no where near the 2.5" that you recommended.

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Many 3D bluray players have a 3D adjustment that will allow you to get more depth, and also 3D TVs have a depth option. What player and TV do you have? I will look up the options for you if I can.
My TV is currently in my signature. It is an LG 47LW5700.

I returned to that scene, paused it, picked a light on New York city's skyline (it might have been the same light), went into my TV's 3D settings, and adjusted the "3D viewpoint" slider from 0 (which is the default) to -10 and then again to +10. At -10, the distance between that light's left eye and right eye versions was about 1 inch. At 0, the distance was about 0.5 inches. At +10, I didn't measure the distance because the two lights were close together enough to appear as one light. While I know that this setting adjusts the picture by either pushing the scene more in front of the screen (+1 through +10, where +10 is the most in front) or more behind the screen (-1 through -10, where -10 is the most behind), I don't know how it works.

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Originally Posted by 3DBob View Post
There is one other issue--make sure the left and right eyes aren't reversed. It creates an odd looking image that cause a strange depth effect. Both players and 3DTVs have an option to switch eyes. A friend of mine watched many 3D movies in switched eye mode and didn't know. He said, he hated 3D until I set it straight for him...
The option that you described is in my TV's 3D settings, but it is configured as it should be. My Xbox One S--which serves as my Blu-ray player--does not have an option to reverse the left and right eye images (at least, not that I've seen; I'm pretty sure that if that option existed, I'd have already seen it).

TV: LG 47LW5700, AVR: Onkyo TX-NR787, speakers: DCM KX speakers:DCM KX-12 Series 2 (as front left and front right), DCM KX Center Series 2, DCM KX-6 Series 2 (as side surround left and right), sources: Xbox One S (with Kinect and Kinect for Windows adapter), Playstation 2 (fat model), Nintendo GameCube (model with digital AV output) with GameBoy Player, Panasonic VCR (PV-4661), PC: Microsoft Surface Pro (5th generation), phone: iPhone 7 Plus
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post #5 of 5 Old 05-05-2020, 11:34 PM
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Half inch is too low, smething is wrong. I'd try to reset 3d functions on your tv and player, if works.

Looks like you are watching a fake 2d to 3d conversion than true 3d, wrong parallax or inverted or bad battery or glasses, I don't know...but if true 3d is active, and with a good 3d content, you should see depth and pop outs even on the smallest screens of a 3d cell phone/tablet, or 3d camcorder monitor, with the right proportions of course.

Try with this video (download if yt forces anaglyph on your app or browser...)


Another good test: if you own a pair of red blue anaglyph glasses you can compare the analglyph vision on yt, of the video above or others, to your tv with rf glasses, the effect and depht (not the colors and crosstalk of course) should be almost the same. If not, you have a real 3d problem to fix on your tv or player.

Epson TW5350(HC 2045), Darbee DVP-5000S, Himedia Q5 Pro, Sony BDP-S6700,
3D RF glasses: Epson, Samsung, Xpand. Fuji FinePix REAL 3D W3, LG Otimus 3D Max, 3D Tablet F892B

Last edited by Car67; 05-05-2020 at 11:56 PM.
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