ssao: improve LOW and HIGH quality levels
ssao: improve LOW and HIGH quality levels

Simply tweak the "spiralTurns" parameter, empirically to improve the
noise pattern produced by the gradient noise. In turn, this helps the
gaussian filter.

 
google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament