Hey Mac VR Users... please consider this build only for testing

Dear Mac VR users - at long last, we've gotten our mitts on a mac that is VR capable - currently Apple's best gpu. And we've finally been able to jump into Caliban Below on Mac. And - - we can see there's a problem... Sorry for the delay in getting to this - we'd been inclined to get something out there for y'all to play with, and hadn't realized the performance was just not that great. Anyway, the PC & Mac builds are now at parity, and we can start digging into what exactly is hitting the performance so hard on Mac. It *should* run better than it does. (perhaps I'm doing something wrong on this end...) My best guess at this point is that there are a couple shaders I'm using for geometry instancing that aren't playing nice. This note is just to mention - we want to tune the mac experience considerably. It should be nice and smooth. More news as it comes.