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Determines what Level of Detail a spatial should be, based on how many pixels
on the screen the spatial is taking up. The more pixels covered, the more
detailed the spatial should be. It calculates the area of the screen that the
spatial covers by using its bounding box. When initializing, it will ask the
spatial for how many triangles it has for each LOD. It then uses that, along
with the trisPerPixel value to determine what LOD it should be at. It
requires the camera to do this. The controlRender method is called each frame
and will update the spatial's LOD if the camera has moved by a specified
amount.