Why would you run Unreal on a separate workstation? Unreal scenes open directly in Aximmetry, and that is a big point of the whole system. Your proposed setup is needlessly complicated and will miss a lot of functionality you get when rendering the UE5scene inside Aximmetry.

Regarding genlock, you will need to genlock the camera and Vive Mars tracking system. With a high frame rate tracking system like ReTracker Bliss you won’t need it, since the tracking data is locked with the camera video input in Aximmetry . 

Thank you for the helpful advice.

The reason I was considering running Unreal Engine on a separate workstation was to reduce rendering load across the system. I wanted to explore whether a distributed setup could help balance performance better.

As for Genlock, I am currently applying it to the camera, Vive Mars tracking system, and the capture card.

Thanks again for your insight!

Hi,

If you are working with a limited budget, the control machine could also run the Video Switcher compound within the same compound as the tracked camera, allowing you to save on the cost of a third machine or a physical switcher.

In theory, you could modify the structure of the camera compounds so that one computer handles Unreal rendering, while the other manages keying and some other processes. However, this setup would not offer significant performance savings, as Unreal rendering is far more demanding than other tasks performed in the camera compound in Aximmetry.

If you are on a tight budget, you can save on a second capture card by using one computer to receive both camera inputs with a single capture card. You can then send the video to the other computer over NDI and return the final render in the same way. However, note that NDI may cause some loss in image quality, increase delay, and higher performance load on the computer. For best results, each computer should have its own capture card.
More on transmitting videos between the machines using NDI in a multi-machine setup here: https://aximmetry.com/learn/virtual-production-workflow/multi-machine-environment/advanced-information-and-features/transmitting-videos-from-render-to-control-machine/ 

If you have only one studio camera but you really want to use two computers, you could use the second computer to render AR elements over the final image from the first computer. Note that this setup is more complex than standard multi-machine workflows that use camera compounds.
You can find information on how to send camera tracking data and video from one computer to another in such a case here:
https://aximmetry.com/learn/virtual-production-workflow/led-wall-production/combine-different-productions-in-separate-machines/ 
Note, you could use Aximmetry to render the AR elements, more on that here: https://aximmetry.com/learn/virtual-production-workflow/obtaining-graphics-and-virtual-assets/creating-content-for-aximmetry-de/advanced-information-and-features/aximmetry-and-unreal-combined-render/ 

Warmest regards,