Originally Posted by Pterodactyl
First version of the box definitely goes with dual single-link inputs. That was also suggested to us by Infitec. It still covers 1080p60 3D gaming, though admittedly not as elegant as when using a single cable. Dual-link inputs might be available later and would be implemented in agreement with Nvidia and/or AMD, there is nothing to worry about. Display Port and SDI inputs will be added if there is demand.
Could you please explain more about non-synchronized outputs from a PC, that sounds like something we could solve, perhaps very easily, in the box? Is the difference between 2 corresponding frames less than 1/2 frame duration, that would make things simpler?
Some information about pricing... we've paid about 10000 euros for 5 prototype boards, just materials and production. Anyway, we would like the most simple version of final products to be about $500 (USD).
Usual disclaimers apply: no guarantees, forward looking statements, etc...
Having 2x single link DVI inputs would work but it wouldn't benefit polarised Dual-projectors users. It only would be useful for Infitec/Dolby colour correction, but apart from that : it doesn't solve any compatibility problem with the sources.
The only source that provides such a dual input is a PC, and PCs suffer from serious issues using this method :
1 - no BluRay 3D support (you have to rip and re-encode the movies into a compaitble format)
2 - zero compatibility with native 3D games trough Nvidia 3D Vision and ATI HD3D APIs (these are the way future application will exclusively output stereo pictures)
3 - sync issues on consumer cards
The sync issues I'm talking about comes from the fact that consumer graphics card drivers don't provide sync lock between the outputs : each DVI out is managed independently : the driver can refresh one output independently from the other : this is not good for stereo 3D where both outputs mush be refreshed simultaneously.
In practice the the DVI outputs drift in and out of sync depending on the application used, the content being displayed, the CPU load and the GPU load.
Sometimes, when the application is fast, the cpu and gpu load are low and that the content is able to render quicker than the refresh rate, the graphics card has the time to gather both the next left and right eye views, and both eye views are refreshed properly.
When any of these conditions are not met (and it happens in most of the applications and especially games where the cpu/gpu load and framerates fluctuate), one the the eye views will update immediately while the other one will not be updated in time and the picture will show up with a delay in this eye.
This delay is variable, sometimes it's less than a frame, sometimes it's more than one frame. When the game has a low framerate, it can reach 2 frames delay or more.
The only way i have discovered to provide frame-lock on consumer cards is to use ATI's Eyefinity feature (using a virtual single-block side by side spanned desktop) but this mode is supported by even less applications than traditional dual-projectors.
Again, I'd like to point out that I don't need your product at this point, the reason why i'm interested by your product is to future-proof my dual-projectors setup by making sure i'll be able to use these upcoming native 3D applications that only support the GPU manufacturer API outputs.