Create a sample demonstrating a simple "micro" scene of a grassy field with a few trees and rocks

[axefrog]

There are to be no animations, interactions or fancy business going on. This sample simply demonstrates to how to construct a simple seen, add a few assets to the scene and lock the camera onto that scene. It might be useful to keep the scene very small, with an edge size of maybe 10 grid units (or less). The edge blocks should show a cut-away grass/dirt/bedrock cross-section.