fix

app.py

@@ -117,9 +117,6 @@ print("✅ Tracking models loaded successfully!")
 
 gr.set_static_paths(paths=[Path.cwd().absolute()/"_viz"])
 
-# --- YOUR ORIGINAL FUNCTIONS (generate_camera_trajectory, render_from_pointcloud, run_spatial_tracker) ---
-# [Keeping these exactly as provided in your snippet]
-
 
 def generate_camera_trajectory(num_frames: int, movement_type: str, base_intrinsics: np.ndarray, scene_scale: float = 1.0) -> tuple:
     speed = scene_scale * 0.02
@@ -213,6 +210,8 @@ def render_from_pointcloud(rgb_frames, depth_frames, intrinsics, original_extrin
 
 @spaces.GPU
 def run_spatial_tracker(video_tensor):
+    if not hasattr(vggt4track_model, "infer"):
+        vggt4track_model.infer = lambda x: vggt4track_model(x)
     if tracker_model.spatrack.base_model is None:
         tracker_model.spatrack.base_model = vggt4track_model