restore group names during obj decoding

src/load/file.js

@@ -30,7 +30,7 @@ function load_data(data, file, ext) {
                 }]);
                 break;
             case "obj":
-                resolve(load.OBJ.parse(data).map(m => { return {mesh: m.toFloat32(), file} }));
+                resolve(load.OBJ.parse(data).map(m => { return {mesh: m.toFloat32(), file: m.name || file} }));
                 break;
             case "3mf":
                 load.TMF.parseAsync(data).then((meshes) => {

src/load/obj.js

@@ -54,7 +54,7 @@ function parse(text) {
                     objs.push(faces = []);
                 }
                 if (toks[0]) {
-                    faces.name = toks[0];
+                    faces.name = toks.join(' ');
                 }
                 break;
         }