Working with the same materials but appears differently

Hi, i m working on an architectural project. I have imported my project from Belnder and i have no overlapping problem, everything s allright. All my meshes use the same material asets (a simple white) but they appear with different scale of grey. I mean my object faces are on the same plan, with the same material and they are on different grey nuances. Somebody can help me? :slight_smile:
On the pictures, the differences are visibles between the walls and the floors (floors is mesh1 and walls mesh2) !

Ok it s resolved. I begin my work on sketchup and the lightmaps weren t on the same scale and direction.