// The osgDB::DatabasePager will call this automatically to purge expired
// tiles from the scene graph.
bool
TilePagedLOD::removeExpiredChildren(double expiryTime,
unsigned expiryFrame,
osg::NodeList& removedChildren)
{
if (_children.size()>_numChildrenThatCannotBeExpired)
{
unsigned cindex = _children.size() - 1;
double minExpiryTime = 0.0;
unsigned minExpiryFrames = 0;
// these were added in osg 3.1.0+
#if OSG_VERSION_GREATER_OR_EQUAL(3,1,0)
minExpiryTime = _perRangeDataList[cindex]._minExpiryTime;
minExpiryFrames = _perRangeDataList[cindex]._minExpiryFrames;
#endif
if (!_perRangeDataList[cindex]._filename.empty() &&
_perRangeDataList[cindex]._timeStamp + minExpiryTime < expiryTime &&
_perRangeDataList[cindex]._frameNumber + minExpiryFrames < expiryFrame)
{
osg::Node* nodeToRemove = _children[cindex].get();
removedChildren.push_back(nodeToRemove);
ExpirationCollector collector( _live.get(), _dead.get() );
nodeToRemove->accept( collector );
if ( _debug )
{
TileNode* tileNode = getTileNode();
std::string key = tileNode ? tileNode->getKey().str() : "unk";
OE_NOTICE
<< LC << "Tile " << key << " : expiring " << collector._count << " children; "
<< "TS = " << _perRangeDataList[cindex]._timeStamp
<< ", MET = " << minExpiryTime
<< ", ET = " << expiryTime
<< "; FN = " << _perRangeDataList[cindex]._frameNumber
<< ", MEF = " << minExpiryFrames
<< ", EF = " << expiryFrame
<< "\n";
}
return Group::removeChildren(cindex,1);
}
}
return false;
}