Fixed wrong filename when storing a textured obj with a relative path (e.g. "./results/out")

include/eos/render/Mesh.hpp

@@ -109,7 +109,7 @@ inline void write_textured_obj(Mesh mesh, std::string filename)
 	boost::filesystem::path mtl_filename(filename);
 	mtl_filename.replace_extension(".mtl");
 
-	obj_file << "mtllib " << mtl_filename.string() << std::endl; // first line of the obj file
+	obj_file << "mtllib " << mtl_filename.filename().string() << std::endl; // first line of the obj file
 
 	// same as in write_obj():
 	if (mesh.colors.empty()) {
@@ -142,7 +142,7 @@ inline void write_textured_obj(Mesh mesh, std::string filename)
 	texture_filename.replace_extension(".isomap.png");
 
 	mtl_file << "newmtl FaceTexture" << std::endl;
-	mtl_file << "map_Kd " << texture_filename.string() << std::endl;
+	mtl_file << "map_Kd " << texture_filename.filename().string() << std::endl;
 
 	return;
 };