The invention relates to a process for obtaining a light-scattering assembly in particular for a motor vehicle, the light-scattering assembly comprising a part including first and second sections. The process includes forming, by injection molding, the first section of the light-scattering assembly, the first section forming a transparent scattering screen having microstructures obtained by injection molding and configured to scatter light passing through said first section, and forming, by injection molding, the second section, the second section being devoid of microstructures obtained by injection molding and configured to scatter light. The second section has an external region extending around at least some of the perimeter of the first section, the external region extending beyond a peripheral portion of the first section [and away from the first section, the first and second sections being formed in contact with each other and being united with each other.