osg::Node*
SingleKeyNodeFactory::createTile(TileModel* model, bool setupChildrenIfNecessary)
{
// compile the model into a node:
TileNode* tileNode = _modelCompiler->compile( model, _frame );
// see if this tile might have children.
bool prepareForChildren =
setupChildrenIfNecessary &&
model->_tileKey.getLOD() < *_options.maxLOD();
osg::Node* result = 0L;
if ( prepareForChildren )
{
//Compute the min range based on the 2D size of the tile
osg::BoundingSphere bs = tileNode->getBound();
GeoExtent extent = model->_tileKey.getExtent();
GeoPoint lowerLeft(extent.getSRS(), extent.xMin(), extent.yMin(), 0.0, ALTMODE_ABSOLUTE);
GeoPoint upperRight(extent.getSRS(), extent.xMax(), extent.yMax(), 0.0, ALTMODE_ABSOLUTE);
osg::Vec3d ll, ur;
lowerLeft.toWorld( ll );
upperRight.toWorld( ur );
double radius = (ur - ll).length() / 2.0;
float minRange = (float)(radius * _options.minTileRangeFactor().value());
TilePagedLOD* plod = new TilePagedLOD( _engineUID, _liveTiles, _deadTiles );
plod->setCenter ( bs.center() );
plod->addChild ( tileNode );
plod->setRange ( 0, minRange, FLT_MAX );
plod->setFileName( 1, Stringify() << tileNode->getKey().str() << "." << _engineUID << ".osgearth_engine_mp_tile" );
plod->setRange ( 1, 0, minRange );
#if USE_FILELOCATIONCALLBACK
osgDB::Options* options = Registry::instance()->cloneOrCreateOptions();
options->setFileLocationCallback( new FileLocationCallback() );
plod->setDatabaseOptions( options );
#endif
result = plod;
// this one rejects back-facing tiles:
if ( _frame.getMapInfo().isGeocentric() && _options.clusterCulling() == true )
{
osg::HeightField* hf =
model->_elevationData.getHeightField();
result->addCullCallback( HeightFieldUtils::createClusterCullingCallback(
hf,
tileNode->getKey().getProfile()->getSRS()->getEllipsoid(),
*_options.verticalScale() ) );
}
}
else
{
result = tileNode;
}
return result;
}
TileGroup::TileGroup(TileNode* tilenode,
const UID& engineUID,
TileNodeRegistry* live,
TileNodeRegistry* dead,
osgDB::Options* dbOptions)
{
_numSubtilesUpsampling = 0;
_numSubtilesLoaded = 0;
_traverseSubtiles = true;
this->addChild( tilenode );
_tilenode = tilenode;
for(unsigned q=0; q<4; ++q)
{
TileKey subkey = tilenode->getKey().createChildKey(q);
TilePagedLOD* lod = new TilePagedLOD(this, subkey, engineUID, live, dead);
lod->setDatabaseOptions( dbOptions );
lod->setCenter( tilenode->getBound().center() );
lod->setRadius( tilenode->getBound().radius() );
this->addChild( lod );
}
}