Trees:
The trees in our game are recursively generated using a simple
algorithm. The algorithm goes as follows. Given a depth level to start
from, the function checks the depth level for equality to zero; if
true, a leaf is drawn. Otherwise, the function scales down all
subsequent drawn objects and draws a branch. Then transformations are
applied to each of the branch's children (leaf or other branches) to get
them into position on top of the recently drawn branch, and the function
calls itself again with its depth level  1. From a big picture point
of view, the branches are drawn and placed over and over, and only when
the recursion has ended, are the leaves drawn.
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