3D Highway plugin — third-party notices
=======================================

The "Butterchurn (visualizer)" background style (the 'butterchurn' option in
the plugin's Background-style setting) bundles the third-party components below
under plugins/highway_3d/assets/vendor/. They are lazy-loaded only when a user
selects that background style.

The 3D Highway plugin and the feedBack project are licensed under the GNU Affero
General Public License v3.0 (AGPL-3.0-only). The components below are under their
own permissive (MIT) licenses, which are compatible with AGPL-3.0.

- Butterchurn — a WebGL implementation of the MilkDrop visualizer.
  https://github.com/jberg/butterchurn
  Copyright (c) Jordan Berg. MIT License.
  Vendored at: plugins/highway_3d/assets/vendor/butterchurn.min.js

- butterchurn-presets — MilkDrop preset pack.
  https://github.com/jberg/butterchurn-presets
  Presets authored by the MilkDrop community (Geiss, Flexi, Martin, Rovastar,
  Zylot, Aderrasi, Cope, Eo.S., Unchained, and many others); refer to each
  preset's embedded attribution.
  Vendored at: plugins/highway_3d/assets/vendor/butterchurnPresets.min.js

- Three.js (r170) — loaded at runtime from feedBack core's vendored copy
  (/static/vendor/three/three.module.min.js). https://threejs.org  MIT License.

Provenance: the Butterchurn background integration originated as the standalone
"3D Highway + Butterchurn" plugin and was merged into the bundled 3D Highway
renderer as the opt-in 'butterchurn' background style.