Do you mean for active you need to render at 120 fps or refresh the screen at 120 Hz? The later I agree with but the former I disagree with. I've been playing 3D games with a 120 Hz refresh (60 Hz for each eye) and a fps between 30 and 60 and it looks awesome.On a passive 3d, half the lines are for your left eye, and half are for your right. But you always see something with both your eyes, there is no active shutter cutting out the picture for one of your eyes temporarily. So effectively, at 1920x1080@60fps, each eye is seeing 1920x540@60fps.
For active 3d, each eye gets 1920x1080@30fps, and each other frame is the eye being blocked. For this to be comfortable, most users report you need that 120fps.
Currently, software is not optimised for passive 3D, or the difference in performance requirements could be even greater, by rendering the screen for each eye at 1920x540 instead of 1920x1080p as I think it is now.
There's a clear resolution downside to the passive setup, but so far that drop in resolution is worth the benefits by a fairly long mile.
You can notice flicker at 60hz ?
Do you mean for active you need to render at 120 fps or refresh the screen at 120 Hz? The later I agree with but the former I disagree with. I've been playing 3D games with a 120 Hz refresh (60 Hz for each eye) and a fps between 30 and 60 and it looks awesome.
The flicker when not looking at the screen is highly noticeable to me (assuming there is another light source in the room to highlight it) however its gone completely when looking at the screen. That's on either TV at 48(?)hz or PC at 120hz.
Unless you have Nvidia's Lightboost.
You also get a perceived resolution increase from active 3D - both on TV and computer graphics. Don't ask me to explain how it works but it's very real. 3D 1080p Blu-Ray on my TV looks closer to 4K than regular 1080p to me.
In that case you don't really see the flicker though. The electric current powering the light bulb just happens do be out of synch with the frequency at which your panel flashes. It's essentially screen tearing, but with light bulbs.
Nvidias 3d vision solves this by allowing you to adjust the image frequency according to your surroundings. If I set my display to 100Hz (50 hz per eye), the flickering of the light bulbs disappears despite the lower refresh rate, because that's also the frequency at which the electric current switches.
One other downside of active, and reason why active is considered to be less bright/less good looking in terms of colors, is that the LCD pixels cannot go from full black to full white fast enough at 120hz, if I remember correctly. And there's the rechargeable glasses of course that are also more expensive. But then for passive, you're more sensitive to the viewing angle - as little as more than 15 degrees off can mess things up.
Yeah, that never seems to work for me you, guess I just have weird frequency lights!
One other downside of active, and reason why active is considered to be less bright/less good looking in terms of colors, is that the LCD pixels cannot go from full black to full white fast enough at 120hz, if I remember correctly.
True, and that's why I'd advice anyone looking for a big and also affordable 3d tv to look into Plasma panels. The sub pixels on Plasma panels respond insanely fast. Like tens of thousands of times faster than LCDs. 3d on Plasma panels looks fantastic.
Very sad about the 1080p/24hz limit, but I couldn't wait any longer to get a 3D capable projector. I'll still get 720p/60hz for smoother gaming, but it's damned annoying. I know the machine is capable of it but the HDMI boffins in their infinite wisdom thought that 24 frames per second was quite enough thank you. Arseholes.
That's why I was asking for clarification. I use 120 Hz refresh (60 Hz for each eye) yet my content isn't updated at that rate so every refresh isn't a different image. The refresh is what needs to be high not the fps. Though what fps provides acceptable smoothness obviously depends on the game.For 60 fps in each eye though surely the GPU has to render 120 separate frames per second as the frames going to each eye are different? fps still gets reported at 60fps. But in reality 120 distinct frames have been rendered. You can prove this by switching 3D off and watching frame rates double. That's using 3D vision though. Other methods like those used by Crysis (reprojection?) certainly don't render every frame twice, but also look less convincing.
True, and that's why I'd advice anyone looking for a big and also affordable 3d tv to look into Plasma panels. The sub pixels on Plasma panels respond insanely fast. Like tens of thousands of times faster than LCDs. 3d on Plasma panels looks fantastic.