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A little advice, if you still need it (quite an old post:), would be to make all the different types of lamps you have in your scene have different light temperatue (read color), with the ceiling halogen lamps having most neutral (yet slightly warm) temperature, the tube lamp more cold (towards gree...

I was wondering, is there a difference, speed or quality wise, between the skyportals and having luminous polygons in the windows? As I understand where the skyportal guides photons from BG into particular windows so nothing is wasted on the outside, the lum polies are shooting photos from correct p...