your question is a bit confusing as i don't see why you are converting 3ds files into obj. files, 3ds files work fine with poser and will auto-assign textures to the 3ds prop, 3d studio max files don't.also not sure if you mean Mat. files or mtl .files, as mtl .files are poser material room files used for variations like hair colour, blond, black etc. whereas mat files, i'm not sure but i don't think poser reads those. vue reads mat files. if you have in your "material" library some mtl files for a prop, if all you have in your scene is an obj. file, when you click that mtl file in the "material room" it will assign that material to the entire obj prop, as the seperate material zones have not been assigned in an obj file.i think all that is right anyway. where are you converting these files?