LOD
The LOD (level of detail) is used to allow browsers to switch between variouse representation of objects automatically. The level of object displayed is based on the distance between the object and the viewer. This distance is calculated from the viewpoint to the center of LOD. If the distance is less then the first value in the range field, then the first level of the LOD is drawn. If the distance is between the first and second values in the range field, the second level is drawn, and so on.
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