Overview
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This demo shows an example of the LodTree model in action. The trees in the scene
are associated to a LodTree object that manage their level of detail of both the 
trunk and the leaves. The level of detail of the objects depend on the distance to 
the camera. When the camera goes away from them, the level of detail decreases, and 
when the camera gets closer to them the level of detail increases to restore the 
original geometry of the model.

The level of detail begins to decrease at a certain distance of the forest, and stops
decreasing when the objects reach the their minimum LOD. This 'lodding' distance is
customizable from the source code of the demo.