@applemaniac
Ok, if I didn't know better, I'd think I had written this post as I have nearly the exact same setup. CAVE, (no cluster though - single host), ART tracking, Windows 7 - OpenGL, Quadro cards. I've spent considerable time working on getting CAVE frustums working.
First, are you aware of the Cluster Rendering support? I've not used it as it's been historically buggy, so I'm just driving our five wall CAVE off of a single host. But, it's supposed to handle input device synchronization, frame sync, swap buffers, etc. Just letting you know in case you weren't aware.
Secondly, are you doing anything with the stereo frustums?
In a CAVE setup with head tracking, because the display position is fixed and the head/eyes are constantly moving, you'll need to calculate a view and projection matrix for each eye's asymmetric view frustum and use the SetStereoViewMatrix and SetStereoProjectionMatrix calls on the stereo camera.
I've had a few gotchas using the approach over the past few years (as I remember)
1. Those matrices are OpenGL standard (eg. right handed)
2. I think they completely override the other camera projection / view settings, and I think they're in world space, not local space.
3. As Unity has continued to add VR platform support, quad buffered stereo seems to be one of the things that breaks regularly between versions. I'm using 5.5.3 now. I think 5.4 was broken, and maybe 5.6. I thought 2017.1 was working, but I've been concentrating on head mounts lately, so it's been a while since I tested the OpenGL stereo code.
Not, sure if that helps, but feel free to follow up with questions if you'd like.
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