Inkqubo yekhethini yeglasi eluhlaza isetyenziswa ngokuyintloko kwi-shading yangaphandle kunye nenkqubo yokushisa ubushushu yangaphakathi, esebenzisa izinto zokuthungatha ukuthintela ukukhanya kwelanga okungeyomfuneko, okanye ukwenza indawo evaliweyo ngokusebenzisa izinto zokugquma ubushushu.