Fix indentation and exception pairing in create_3d_model

app.py

@@ -183,11 +183,14 @@ def save_3d_model(scene: trimesh.Scene, filename: str) -> bool:
     """Export the 3D scene to a GLB file."""
     try:
         scene.export(filename)
-        return os.path.exists(filename)
-        print("💾 wrote file?", os.path.exists(filename))
-        print("💾 filesize:", os.path.getsize(filename) if os.path.exists(filename) else "n/a")
+        file_exists = os.path.exists(filename)
+        print("💾 wrote file?", file_exists)
+        if file_exists:
+            print("💾 filesize:", os.path.getsize(filename))
+        return file_exists
 
-    except Exception:
+    except Exception as e:
+        print(f"❌ Error saving 3D model: {e}")
         return False
 
 
@@ -230,11 +233,13 @@ def generate_3d_model(latitude: float, longitude: float, radius: int) -> Tuple[s
         
         if len(scene.geometry) == 0:
             return None, "❌ Could not create 3D model from the buildings found.", ""
-        
-        # Step 4: Save model
+          # Step 4: Save model
         timestamp = int(time.time())
         filename = f"osm_3d_model_{timestamp}.glb"
         
+        # Ensure we can write to the current directory
+        os.makedirs(os.path.dirname(os.path.abspath(filename)) if os.path.dirname(filename) else ".", exist_ok=True)
+        
         status_msg += f"\n✅ 3D model created with {len(scene.geometry)} buildings\n💾 Saving model..."
         
         if save_3d_model(scene, filename):