Originally Posted by rdjam
OK - I looked up iZ3D after someone mentioned in the 3DXL thread.
It looks very intriguing.
OK - specific scenario. I'd like to TRY to get two outputs working, with two very high-end cards - either ATI or NVidia, you tell me - to drive a projector each.
I'd like to output a full 1080p60 to each projector.
This would be to play windows games like Dirt2, HAWX 2, etc. Ideally, I want to have DirectX 11 support, to really have a "blow away" presentation.
Looking at iZ3D, it seems to have issues when antialiasing etc is turned on? Can it work with the ATI setup you mention here, or would it not be needed?
What do you think? Doable?
No, it's not doable...
I mean not even one of your propositions.
You should plug both projectors to the same graphics card, all high-end modern graphics card support it. My ATi card can even run a 3rd display on the DisplayPort output. I use a VGA adapter to plug my monitor on it so I don't have to plug/unplug my cable all the time.
I even tested doing 3D video editing with Sony vegas using the monitor to edit and the dual projectors to preview on the big screen. It worked surprising very well, even though I've got an old version of Vegas that does not officially support 3D (I manually put the streams side by side) and which can't output projects with resolutions higher than 2K (I have to edit downscaled and then do the rendering individually for each view) and with which I had terrible preview framerate because I used uncompressed video and my hard drives can't keep up, and that the ergonomy of my setup was clearly not adapted for this setup (the computer monitor faces backwards, I've got the projection screen behind me when editing).... it was still fun and totally awesome.
I'll have move some furniture around the next time I want to edit a 3D project.
At the moment, 3D gaming with multi-GPU is only supported by Nvidia 3D vision and it does not support dual-projectors. (it would maybe be supported by games with native 3D but I haven't read about it)
With iZ3D or DDD you won't get any framerate improvements at all, but they officially say they're working on it. (with no ETA)
If you already have two cards, then keep them, you'll be able to test it every new release, but if you don't have them already, don't waste your money : just buy one card.
The iZ3D driver will output dual 1080p60 but there is a catch : the iZ3D driver does not take care of V-sync : the GPU driver does it. This can cause sync problems.
With ATI, all user reports confirm the phenomenon I have : with the traditional dual projector mode, sync is not maintained and it is horrible.
You can put the outputs in perfect sync by using the Eyefinity feature, it works great for movies and a very small selection of games (2 games) but the iZ3D does not support the side by side full resolution aspect ratio required : it only supports it with squashed half resolution so even if it does render the real full 3840x1080 resolution (for games compatible with eyefinity super-wide surround resolution), the aspect ratio will be wrong.
I asked iZ3D to add side by side full resolution, I got a positive response but I do not know when it will be implemented.
With Nvidia cards, user reports tell different stories. for some there is no sync issues, but for others their systems have the same sync issues than ATI... but Nvidia does not provide the Eyefinity feature as a work-around : their super-wide surround system (Nvidia Surround) requires 3 screens and a dual card SLI. This means if you go with Nvidia you're goingwithout knowing what to expect.
If I were to recommend between ATi and Nvidia, I'd choose ATI because even if it doesn't do everything, at least I can predict how it will work and I know it will always work with the Eyefinity mode.
For games compatibility : let me make something very clear, the games with perfect graphics are extremely rare. The more recent, advanced with breakthrough technology the game is, the more likely the picture will be completely ruined. The usual biggest problems revolve around shadows being projected wrongly or in 2D at screen depth, and modern games graphics depend a lot on them.
The most obvious example is Crysis : you have to turn almost everything off to get something even remotely watchable and it's still not artefact free. In this respect, even Far Cry looks better than Crysis.
It was so bad that when Crytek wanted to make Crysis 2 in 3D, they decided to go with a native engine. I do not know the exact list of supported displays but the only time Crytek spoke about it, all they said was that they would support everything on the market without any further detail.
Two other games µI know of have 3D native engines :
Avatar the game, it supports dual projectors with the traditional method but I experience severe unsync (more than 2 frames of delay) and is unplayable on my ATI based system, I have not tried on Nvidia though
Trackmania Nations (with the latest patches) : it works using the Eyefinity mode, the only problem is the interface does not work (you can just play ingame and there is a key to hide the interface, but menus and the map editor are unusable)
With the iZ3D driver :
DIRT 2 has lots of visual artefacts (especially shadows and lighting effects) that will ruin everything, in both DX9 and DX11 mode.
I don't know about HAWX 2, but the first one had many issues. I heard they made some improvements for Nvidia 3D vision but it's still not bug-free, and I do not know if that translates well for iZ3D, i suggest you try it first with anaglyph and see if there are any artefacts. (you should expect many)
I play lots of games with iZ3D driver and Anti Aliasing usually works fine, in which games did you read about AA issues ? Or maybe particular types of displays ?