Update app.py

app.py

@@ -257,6 +257,10 @@ def generate_results_and_mesh(image, session_id=None):
     mesh_dir = os.path.join(os.environ["PIXEL3DMM_TRACKING_OUTPUT"], session_id, "mesh")
     mesh_file = first_file_from_dir(mesh_dir, "ply")
 
+    print(f"[DEBUG] looking in {mesh_dir}, found mesh_file = {mesh_file}")
+    if mesh_file and not os.path.exists(mesh_file):
+        print(f"[ERROR] mesh_file path exists variable is non‐existent on disk!")
+
     final_status = "\n".join([status1, status2, status3, status4])
     return final_status, crop_img, normals_img, uv_img, track_img, mesh_file