strange happenings with fog and spotlight (Quest)

Hi

Im getting an odd issue on Oculus Quest - the ground plane of some scenes are only taking on light (from a head mounted spotlight) in the middle of the scene only - anywhere else its appearing black. Its a mystery because it all worked perfectly until recently. It still looks fine when viewed in editor and on Rift though.
Im baking lights and have only 1 realtime spotlight in the scene.

We're using Exponential squared fog and have also got the custom fog exports set in the GraphicsSettings to allow for this.


i havent got the foggiest (sorry) idea why this is. Would any body have any ideas?

many thanks
Nick

 

here's an image to help illustrate... its just the floor plane thats doing it, when i look away from centre it goes black. When i look to where im stood - the light takes effect!

If i turn fog off - the light works fine. But it used to work fine with fog, so i dont know whats changed to make it do this :-/