Add path validation for visualize commands (#604)

Author: iory

skrobot/apps/visualize_mesh.py

@@ -36,6 +36,7 @@ def main():
         viewer = skrobot.viewers.TrimeshSceneViewer()
     elif args.viewer == 'pyrender':
         viewer = skrobot.viewers.PyrenderViewer()
+    loaded_count = 0
     for mesh_path in args.input_mesh_paths:
         if not osp.exists(mesh_path):
             print(f"Warning: Mesh file not found at {mesh_path}. Skipping.")
@@ -46,9 +47,14 @@ def main():
             print(mesh)
             link = skrobot.model.Link(collision_mesh=mesh, visual_mesh=mesh)
             viewer.add(link)
+            loaded_count += 1
         except Exception as e:
             print(f"Error loading mesh {mesh_path}: {e}. Skipping.")
 
+    if loaded_count == 0:
+        print("Error: No mesh files could be loaded. Exiting.")
+        return
+
     axis = Axis(pos=np.array([0, 0, 0]),
                 rot=np.eye(3),
                 axis_length=args.axis_length,

skrobot/apps/visualize_urdf.py

@@ -41,6 +41,8 @@ def main():
     if args.ros is not None:
         robot_model = RobotModel.from_robot_description(args.ros)
     else:
+        if not osp.exists(args.input_urdfpath):
+            parser.error(f"URDF file not found: {args.input_urdfpath}")
         robot_model = RobotModel.from_urdf(osp.abspath(args.input_urdfpath))
 
     viewer.add(robot_model)