Thanks for the quick answer! 
Turning down refraction does reduce the issue. Why does this happen in VR only though? Didn't think of changing the default parameters since it looked fine when rendering to the main display.
I would really like to use refraction, but just raising it slightly above zero will still turn the surface almost entirely dark at a distance of only a few units.
Turning down refraction does reduce the issue. Why does this happen in VR only though? Didn't think of changing the default parameters since it looked fine when rendering to the main display.
I would really like to use refraction, but just raising it slightly above zero will still turn the surface almost entirely dark at a distance of only a few units.