i really like open GL renders with edges and ambient occlusion lighting for it's speed and scetchy look .But as we do interiors, the ceiling allways appeared dark i allways worked arround with an imported plane white PDF-page that allways rendered white but latly disovered a 2D rectangle does the trick too... maybe it's helpful and maybe i could tell my rendersetup one day "make white ceiling" as probably most people want to have....
merry X-mas to everybody