TY JOUR TI OPTIMIZING THE NATURAL ILLUMINATION OF RANDOM SHAPE PREMISES KW light field KW natural illumination KW normal illumination KW the light flow KW surface. JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Chernysheva , K.. AU Brusentsev, A.. PY 2017 IS 2 PB Belgorod State Technological University named after V.G. Shukhov