Update app.py

z-up to y-up coordinate system.

app.py

@@ -162,13 +162,12 @@ def image_to_3d(
     return state, video_path
 
 @spaces.GPU
-
 def extract_high_quality_mesh(
     state: dict,
     req: gr.Request,
 ) -> Tuple[str, str]:
     """
-    Save raw mesh data directly without any processing.
+    Save raw mesh data directly with correct orientation.
     """
     user_dir = os.path.join(TMP_DIR, str(req.session_hash))
     
@@ -177,13 +176,17 @@ def extract_high_quality_mesh(
     faces = state['mesh']['faces']
     trial_id = state['trial_id']
     
-    # Create mesh and save directly
-    simple_mesh = trimesh.Trimesh(vertices=vertices, faces=faces)
+    # Rotate vertices from z-up to y-up
+    rotation_matrix = np.array([[1, 0, 0], [0, 0, -1], [0, 1, 0]])
+    rotated_vertices = vertices @ rotation_matrix
+    
+    # Create mesh and save
+    simple_mesh = trimesh.Trimesh(vertices=rotated_vertices, faces=faces)
     glb_path = os.path.join(user_dir, f"{trial_id}_full.glb")
     simple_mesh.export(glb_path)
     
     return glb_path, glb_path
-
+    
 @spaces.GPU
 def extract_reduced_glb(
     state: dict,