The .mtl is a resource file created at the same time as the .obj file. Basically it contains pointers to all of the materials (in Poser's case bump/texture/transparancey maps) used in the file. If you import the .obj into Bryce, all the textures will be loaded as well (presuming you've kept the .obj file in the same directory as the textures - otherwise Bryce will ask you to find them in a standard file selector box). Any other 3d program (like 3DS) which can read an .obj file and it's relevant .mtl file will also import the textures (correctly mapped) as well. Paul