Update app.py

app.py

@@ -460,19 +460,44 @@ async def i3s_smart_middleware(request: Request, call_next):
             # Case B: Nodes (e.g. .../nodes/root or .../nodes/15)
             # Expects: .../nodes/root/3dNodeIndexDocument.json
             elif "/nodes/" in path:
-                # If local_path is a directory, look for 3dNodeIndexDocument.json
-                if os.path.isdir(local_path):
-                     possible_doc = os.path.join(local_path, "3dNodeIndexDocument.json")
-                     if os.path.isfile(possible_doc):
-                          target_file = possible_doc
-            
+                # Handle sub-resources of nodes
+                clean_path = local_path.rstrip(os.sep)
+                
+                if "/geometries/" in path:
+                    # .../geometries/0 -> .../geometries/0.bin
+                    possible_bin = clean_path + ".bin"
+                    if os.path.isfile(possible_bin):
+                        target_file = possible_bin
+                        media_type="application/octet-stream"
+                        
+                elif "/features/" in path:
+                    # .../features/0 -> .../features/0.json
+                    possible_json = clean_path + ".json"
+                    if os.path.isfile(possible_json):
+                        target_file = possible_json
+                
+                elif "/textures/" in path:
+                     # Textures are tricky, often .jpg or .bin.dds
+                     # Just try appending extensions
+                     for ext in [".jpg", ".png", ".bin.dds", ".dds"]:
+                         possible_tex = clean_path + ext
+                         if os.path.isfile(possible_tex):
+                             target_file = possible_tex
+                             break
+
+                else:
+                    # It is a Node itself (e.g. .../nodes/1)
+                    # If directory, look for 3dNodeIndexDocument.json
+                    if os.path.isdir(clean_path):
+                         possible_doc = os.path.join(clean_path, "3dNodeIndexDocument.json")
+                         if os.path.isfile(possible_doc):
+                              target_file = possible_doc
+
             # Case C: NodePages (e.g. .../nodepages/0 or .../nodepages/0/)
             # Expects: .../nodepages/0.json
             elif "/nodepages/" in path:
                  # Strip trailing slash if present to cleanly append .json
-                 clean_local_path = local_path
-                 if clean_local_path.endswith(os.sep):
-                     clean_local_path = clean_local_path[:-1]
+                 clean_local_path = local_path.rstrip(os.sep)
                      
                  # Check if adding .json helps
                  possible_json_page = clean_local_path + ".json"