There is one spot in my map, where no matter how many brushes I try to cover it up with, you can always see straight though them to the void. Obviously seeing the void is bad visual effect 
See the void
_rD_MrPink
([rD]MrPink)
#1
redfella
(redfella)
#3
Try erasing all the brushes and then creating one brush that fits. Then run ‘brush cleanup’. …Chances are are that u already tried these things though.
damocles
(damocles)
#4
Is the void area solid? If it is, chances are you have a structural caulk brush sitting there - but then I’m sure you could notice that in Radiant unless you filtered out caulk and forgot to turn it back on.
_rD_MrPink
([rD]MrPink)
#5
I never tried brush cleanup… and that spot has grass just like the area around it when looked at in GTK.