update app.py for GLB output

app.py

@@ -388,7 +388,7 @@ def stage2_run(models, device, tmp_dir,
     mesh.vertices[:, 0] = -mesh.vertices[:, 0]
     mesh.faces = np.fliplr(mesh.faces)
     # Export the mesh as .obj file with colors
-    mesh.export(mesh_path, file_type='obj', include_color=True)
+    mesh.export(mesh_path.replace('.obj', '.glb'), file_type='glb', include_color=True)
     torch.cuda.empty_cache()
 
     if not is_rerun: