Overview
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This demo shows an example of the LodTree model in action. The scene is composed of 
several tree groups which are associated to a LodTree object that manage the level 
of detail of both their trunk and leaves. The level of detail of the objects depends
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 increases to restore the original 
geometry of the model.

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

The user can compare the differences in performance disabling the LOD management while 
maintaining pressed F2.