Forest demo — asset credits
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TREE MODELS — Creative Commons Attribution 4.0 (CC-BY 4.0), attribution required:
  * "Fir tree" by Georgeous — https://skfb.ly/pA8TG
  * "Noel_Pine_Tree" by 3D Error 404 — https://skfb.ly/6XHoJ
  * "Maple trees pack (lowpoly, game ready, LODs)" by LOLIPOP — https://skfb.ly/p9tGx
  * "Realistic Trees Collection" by Jungle Jim — https://skfb.ly/pDzJR
  * "Low Poly Forest Tree Pack" by 99.Miles — https://skfb.ly/pJXrH
  License: http://creativecommons.org/licenses/by/4.0/

  The attribution each author asks for:

    "Fir tree" (https://skfb.ly/pA8TG) by Georgeous is licensed under Creative
    Commons Attribution (http://creativecommons.org/licenses/by/4.0/).

    "Noel_Pine_Tree" (https://skfb.ly/6XHoJ) by 3D Error 404 is licensed under
    Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/).

    "Maple trees pack (lowpoly, game ready, LODs)" (https://skfb.ly/p9tGx) by
    LOLIPOP is licensed under Creative Commons Attribution
    (http://creativecommons.org/licenses/by/4.0/).

    "Realistic Trees Collection" (https://skfb.ly/pDzJR) by Jungle Jim is
    licensed under Creative Commons Attribution
    (http://creativecommons.org/licenses/by/4.0/).

    "Low Poly Forest Tree Pack" (https://skfb.ly/pJXrH) by 99.Miles is licensed
    under Creative Commons Attribution
    (http://creativecommons.org/licenses/by/4.0/).

GROUND / DETAIL TEXTURES — CC0 (public domain, no attribution required):
  * ambientCG.com — Grass004, Ground042 (forest floor), Ground068 (dirt),
    Rock030, Snow006, Bark012. Cached under the per-user app-data directory.

TERRAIN ELEVATION:
  * Great Smoky Mountains heightfield derived from the public AWS Terrain Tiles
    (Terrarium/Mapzen), which aggregate SRTM, USGS 3DEP and other open sources.
