The default shader pack's clouds (shaderpacks/default) follow Andrew Schneider's Nubis cloud system for Guerrilla
Games' Horizon Zero Dawn ("The Real-Time Volumetric Cloudscapes of Horizon Zero Dawn", SIGGRAPH 2015; "Nubis:
Authoring Real-Time Volumetric Cloudscapes with the Decima Engine", SIGGRAPH 2017; GPU Pro 7, 2016), as these
projects implement it. Their notices follow.

shape.png, detail.png and curl.png are the noise volumes and the curl field shipped by Meteoros (the volumes made with
the Nubis Noise Generator released with Schneider's talks; the curl field from the Bitsquid blog, "Volumetric
clouds", 2016), laid out as strips of slices. The clouds' model and light follow Schneider's GPU Pro 7 listings, as
Meteoros ports them; Frostnova and Volumarcher were read alongside.

sheets.png, the high clouds' images, is Viewpoint's own, baked from noise by its dev tool CloudSheetBake after the
way Schneider's 2015 talk draws Horizon Zero Dawn's alto and cirro clouds (tiling images scrolled on the wind).

Meteoros - https://github.com/AmanSachan1/Meteoros

  MIT License

  Copyright (c) 2017 Aman Sachan

  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.

Frostnova (CIS 5650 final project) - https://github.com/YueZhang1027/CIS5650-Final-Project-Frostnova

  Copyright (c) 2023 Janet Wang, Xinyu Niu, Yue Zhang. Used under the terms of the MIT License above.

Volumarcher - https://github.com/Twenmod/Volumarcher

  MIT License

  Copyright (c) 2026 Jack Tollenaar

  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.
