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;
}
Esempio n. 2
0
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 );
    }
}