i'm not an indoor expert but if you leave the sun outside , try to make it come through a window or door(or remove the roof if you dont need it) i do it the stupid way, i put the sun inside to play with the scene and after i'm happy with the scene, i put the sun back outside and play with spots or point lights. the "waiting room" scene that comes with vue 3 seems to use tons of point lights.(but it is a complicated one)so i would put a point light inside and play with the luminosity of it. good luck jp