virtual void apply(osg::PagedLOD& node)
{
//The PagedLOD node will contain two filenames, the first is empty and is the actual geometry of the
//tile and the second is the filename of the next tile.
if (node.getNumFileNames() > 1)
{
//Get the child filename
const std::string &filename = node.getFileName(1);
if (osgEarth::Registry::instance()->isBlacklisted(filename))
{
//If the tile is blacklisted, we set the actual geometry, child 0, to always display
//and the second child to never display
node.setRange(0, 0, FLT_MAX);
node.setRange(1, FLT_MAX, FLT_MAX);
}
else
{
//If the child is not blacklisted, it is possible that it could have been blacklisted previously so reset the
//ranges of both the first and second children. This gives the second child another
//chance to be traversed in case a layer was added that might have data.
osg::ref_ptr< MapNode::TileRangeData > ranges = static_cast< MapNode::TileRangeData* >(node.getUserData());
if (ranges)
{
if (node.getRangeMode() == osg::LOD::PIXEL_SIZE_ON_SCREEN)
{
node.setRange( 0, ranges->_minRange, ranges->_maxRange );
node.setRange( 1, ranges->_maxRange, FLT_MAX );
}
else
{
node.setRange(0, ranges->_minRange, ranges->_maxRange);
node.setRange(1, 0, ranges->_minRange);
}
}
}
}
traverse(node);
}
void IntersectionVisitor::apply(osg::PagedLOD& plod)
{
if (!enter(plod)) return;
if (plod.getNumFileNames()>0)
{
#if 1
// Identify the range value for the highest res child
float targetRangeValue;
if( plod.getRangeMode() == osg::LOD::DISTANCE_FROM_EYE_POINT )
targetRangeValue = 1e6; // Init high to find min value
else
targetRangeValue = 0; // Init low to find max value
const osg::LOD::RangeList rl = plod.getRangeList();
osg::LOD::RangeList::const_iterator rit;
for( rit = rl.begin();
rit != rl.end();
rit++ )
{
if( plod.getRangeMode() == osg::LOD::DISTANCE_FROM_EYE_POINT )
{
if( rit->first < targetRangeValue )
targetRangeValue = rit->first;
}
else
{
if( rit->first > targetRangeValue )
targetRangeValue = rit->first;
}
}
// Perform an intersection test only on children that display
// at the maximum resolution.
unsigned int childIndex;
for( rit = rl.begin(), childIndex = 0;
rit != rl.end();
rit++, childIndex++ )
{
if( rit->first != targetRangeValue )
// This is not one of the highest res children
continue;
osg::ref_ptr<osg::Node> child( NULL );
if( plod.getNumChildren() > childIndex )
child = plod.getChild( childIndex );
if( (!child.valid()) && (_readCallback.valid()) )
{
// Child is NULL; attempt to load it, if we have a readCallback...
unsigned int validIndex( childIndex );
if (plod.getNumFileNames() <= childIndex)
validIndex = plod.getNumFileNames()-1;
child = _readCallback->readNodeFile( plod.getDatabasePath() + plod.getFileName( validIndex ) );
}
if ( !child.valid() && plod.getNumChildren()>0)
{
// Child is still NULL, so just use the one at the end of the list.
child = plod.getChild( plod.getNumChildren()-1 );
}
if (child.valid())
{
child->accept(*this);
}
}
#else
// older code than above block, that assumes that the PagedLOD is ordered correctly
// i.e. low res children first, no duplicate ranges.
osg::ref_ptr<osg::Node> highestResChild;
if (plod.getNumFileNames() != plod.getNumChildren() && _readCallback.valid())
{
highestResChild = _readCallback->readNodeFile( plod.getDatabasePath() + plod.getFileName(plod.getNumFileNames()-1) );
}
if ( !highestResChild.valid() && plod.getNumChildren()>0)
{
highestResChild = plod.getChild( plod.getNumChildren()-1 );
}
if (highestResChild.valid())
{
highestResChild->accept(*this);
}
#endif
}
leave();
}