tree.obj is released under
Creative Commons Zero (Public Domain)
Downloaded from http://www.blendswap.com/blends/view/59269
 "Low-poly foliege" by EugeneKiver

houses are released under
Creative Commons Zero v1.0 Universal (Public Domain)
Downloaded from https://kenney.itch.io/kenney-game-assets-2
Kenney Game Assets 2