Stereo Settings for Shutterglasses with DLP Projectors

[alexander.gall1]

Hi, i hope i post here in the most fitting forum. If not please redirect me.

Outline

I have a workstation with two RTXA5000 connected via a NVIDIA Quadro Sync II. With the graphics cards I control 3 Optoma CinemaX D2 projectors (4K 60Hz). I connect each graphics card with a 8k DPI (GPU) to HDMI(Projector) cable. The goal is to view 3D content on the DLP capable projectors with 3D shutter glasses. The glasses are capable with 90Hz/100Hz 120Hz/144Hz. I have the problem that I do not perceive any 3D effect. I suspect that the Hz of the Beamer does not match that of the 3D glasses. I’m having trouble figuring out where (Nvidia Control Panel, Windows11) and what values to set? I am testing with a vtk application from which i know it would yield a 3D effect.

Experiments

Note: I have tested different resolutions and refresh rates - in this example I use the lowest resolution the projector can manage for 3D to avoid any problems with too low refresh rates.

The 4K projectors are set in Windows (see image) to 1280x720 (3D) and the check mark in W11 for 3D is set. The refresh rate is set to 29.97Hz.

With that alone i do not get a 3D effect (i.e., viewing with the shutter glasses gives no 3D effect). In the vtk application i can see that there is a flickering (left/right image). You can also see that in the second image the Desktop mode hast the desired resolution and refresh rate BUT there is a active signal mode which is 3840x2160, 29,97Hz. The Beamer also displays that its set to 3840x2160, 30Hz.
Thats why i tried setting the parameters through the Nvidia Control Panel. There it gets set to 4kx2k, 1280x720 with 29Hz. If i try to set it here to something different, for example from the tab Ultra HD, HD,SD to 1280x720 on the PC tab with 120Hz it resets itself. Even other refresh rates or resolution just end up in a reset back to 4kx2k, 1280x720 with 29Hz. The projectors state for PC-3D-Timing that they can use 1920x1080 with 120Hz. I also checked the global 3D settings in the Nvidia Control Panel. Here i set stereo to ON and selected generic active stereo but i also tried Displayport In-Band Stereo. Do i need a different/additional setting?

Question

What settings should i set and where should i set them. In Windows or only in Nvidia or somewhere else? And is there a tutorial to connect multiple projectors via one/two graphics cards which could help me here?

[MarkusHoHo]

Hi there @alexander.gall1,

I had already seen your original post, but this one of course helps with more detail.

Personally I have no idea how to help you sadly, besides suggesting to start simple first to verify any working setup. For example just using one GPU with one projector and try out simple 3D video playback to find correct settings.

I am also not sure if the workstation GPUs support 3D output in the first place, as this was a consumer feature for the most part and never really took off properly. I am not aware that we actively develop this further.

I tried reaching out to some other people, but so far I could not find the right experts. I’ll continue looking, but no promises.

[alexander.gall1]

@MarkusHoHo Thanks for the help and trying to find someone who might have any further suggestions.

I am actively testing various combinations. I have also taken out the sync card and will now try it with just one graphic card.
Regarding 3D support, there is the option to enable stereo in the settings and different display modes (see picture).

So i hope the projector is then able to detect the 3D Input and can utilize DLP-Link for the shutter glasses.

[Frank_Quadro]

Hi,
pls explain how the glasses, the sync emitter of the glasses is connected? (what GPU are you on?) it should either be connected to the optional 3pinMiniDIN connector for stereo sync (4000 class and up only!), that would be needed next to the GPU (generic active stereo setting or Intergrated DIN), or, if you expect the projector to be able to handle the DisplayPort in-band stereo signalling correctly, the glasses’ emitter must be connected to the projectors stereo out (display port in-band).
Once you got this working for a single GPU and projector, you can add the 2nd GPU, make the one that drives the stereo the sync master, the other GPU/screen the sync clinet, and they shall follow the first. no extra cabling, no difference thant to single GPU config needed…