Fix indentation and exception pairing in create_3d_model

app.py

@@ -123,24 +123,21 @@ def create_3d_model(buildings: List[Dict]) -> trimesh.Scene:
     scene = trimesh.Scene()
     
     for i, building in enumerate(buildings):
-        # only debug the first 5 to avoid log spam
         debug = (i < 5)
-        
         footprint = building["footprint"]
         height = building.get("height", 10)
         if debug:
             print(f"🏗️  Building #{i}: {len(footprint)} points, height={height}")
-        
         if height <= 0:
             if debug: print("   ↳ skipping: non-positive height")
             continue
-        
-        # make the 2D polygon
+
+        # build the polygon
         try:
             polygon = sg.Polygon(footprint)
             if debug:
                 print(f"   ↳ polygon valid={polygon.is_valid}, area={polygon.area:.2f}")
-            if not polygon.is_valid:
+            if not polygon.is_valid or polygon.area == 0:
                 polygon = polygon.buffer(0)
                 if debug:
                     print(f"     ↳ after buffer valid={polygon.is_valid}, area={polygon.area:.2f}")
@@ -148,18 +145,21 @@ def create_3d_model(buildings: List[Dict]) -> trimesh.Scene:
                     if debug: print("     ↳ skipping: invalid or zero-area polygon")
                     continue
         except Exception as e:
-            if debug: print(f"   ↳ skipping: polygon construction error: {e}")
+            if debug: print(f"   ↳ skipping: polygon error: {e}")
             continue
         
-        # extrude: prefer triangle if available, otherwise earcut
+        # **Extrude + orient + add all in one try/except**
         try:
-            extruded = trimesh.creation.extrude_polygon(polygon, height, engine="triangle")
-        except (ImportError, ValueError) as e:
+            # attempt triangle, else fall back
+            try:
+                extruded = trimesh.creation.extrude_polygon(polygon, height, engine="triangle")
+            except (ImportError, ValueError) as e:
+                if debug:
+                    print(f"   ↳ triangle engine error ({e}), falling back to earcut")
+                extruded = trimesh.creation.extrude_polygon(polygon, height, engine="earcut")
+            
             if debug:
-                print(f"   ↳ triangle engine unavailable ({e}), falling back to earcut")
-            extruded = trimesh.creation.extrude_polygon(polygon, height, engine="earcut")
-        if debug:
-            print(f"   ↳ extruded mesh vertices={len(extruded.vertices)}, faces={len(extruded.faces)}")
+                print(f"   ↳ extruded mesh vertices={len(extruded.vertices)}, faces={len(extruded.faces)}")
             
             # orientation fix
             transform_x = trimesh.transformations.rotation_matrix(np.pi/2, (1, 0, 0))
@@ -171,13 +171,14 @@ def create_3d_model(buildings: List[Dict]) -> trimesh.Scene:
             if debug: print("   ↳ added to scene")
         
         except Exception as e:
-            if debug: print(f"   ↳ skipping: extrusion error: {e}")
+            if debug: print(f"   ↳ skipping: extrusion/orientation error: {e}")
             continue
-    
+
     print(f"🔧  Final scene.geometry count: {len(scene.geometry)}")
     return scene
 
 
+
 def save_3d_model(scene: trimesh.Scene, filename: str) -> bool:
     """Export the 3D scene to a GLB file."""
     try: