The viewer includes Three.js revision 180 and its OrbitControls,
GLTFLoader, BufferGeometryUtils and RoomEnvironment modules.

MIT License

Copyright 2010-2025 Three.js Authors

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to
do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

The reference images were supplied by the user and are reproduced in
this architectural presentation for design traceability. No third-party 3D assets,
external stock photos or AI-generated substitute renders are included.

HDRI environments from Poly Haven, licensed CC0:
Modern Buildings 2 by Alexander Scholten
https://polyhaven.com/a/modern_buildings_2
Industrial Sunset (Pure Sky), original by Sergej Majboroda, sky edits by Jarod Guest
https://polyhaven.com/a/industrial_sunset_puresky
License: https://polyhaven.com/license
The viewer uses the Modern Buildings 2 environment.
HDRLoader.js is from Three.js r180 and is covered by the MIT notice above.

Viewer controls were adapted from the user-supplied
residential-viewer-tools-code-v18.zip for this twin-towers model.
The supplied geometry algorithms retain their license notices:
- Earcut: tools-v18/vendor/LICENSE-earcut.txt
- Polygon Clipping: tools-v18/vendor/LICENSE-polygon-clipping.md
- Robust Predicates: tools-v18/vendor/LICENSE-robust-predicates.txt
- Splaytree: tools-v18/vendor/LICENSE-splaytree.txt