[osg-users] What's the means about the "priorityOffset" and "priorityScale" in pagedLOD?

[FreeSouth]

 Hi :I want to know the function about this two parameter : priorityOffset and 
priorityScale , which appear in pagedLOD's constructor~~~~ , like this : 
PagedLOD::PerRangeData& PagedLOD::PerRangeData::operator = (const PerRangeData& 
prd)
{
    if (this==&prd) return *this;
    _filename = prd._filename;
    _priorityOffset = prd._priorityOffset;
    _priorityScale = prd._priorityScale;
    _timeStamp = prd._timeStamp;
    return *this;
}
Thank you.FS
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