Hello! After developing the model and setting all the textures on SketchUp, I imported my 3Ds file into Dialux Evo and placed all the desired lighting. After that, I calculated my project and created the raytracer image. I can't figure out why, but the walls, ceiling and other elements are higly reflective. I've tried adjusting the reflectance of the materials, but it always goes back to the previous setting.
I've inserted the raytracer image and a sketchup screenshot bellow.

*The walls have a light grey and black material applied, and the ceiling has white material applied.