osg::Node*
OSGTileFactory::createPlaceholderTile(const MapFrame& mapf,
StreamingTerrain* terrain,
const TileKey& key )
{
// Start out by finding the nearest registered ancestor tile, since the placeholder is
// going to be based on inherited data. Note- the ancestor may not be the immediate
// parent, b/c the parent may or may not be in the scene graph.
TileKey ancestorKey = key.createParentKey();
osg::ref_ptr<StreamingTile> ancestorTile;
while( !ancestorTile.valid() && ancestorKey.valid() )
{
terrain->getTile( ancestorKey.getTileId(), ancestorTile );
if ( !ancestorTile.valid() )
ancestorKey = ancestorKey.createParentKey();
}
if ( !ancestorTile.valid() )
{
OE_WARN << LC << "cannot find ancestor tile for (" << key.str() << ")" <<std::endl;
return 0L;
}
OE_DEBUG << LC << "Creating placeholder for " << key.str() << std::endl;
const MapInfo& mapInfo = mapf.getMapInfo();
bool hasElevation = mapf.elevationLayers().size() > 0;
// Build a "placeholder" tile.
double xmin, ymin, xmax, ymax;
key.getExtent().getBounds( xmin, ymin, xmax, ymax );
// A locator will place the tile on the globe:
osg::ref_ptr<GeoLocator> locator = GeoLocator::createForKey( key, mapInfo );
// The empty tile:
StreamingTile* tile = new StreamingTile( key, locator.get(), terrain->getQuickReleaseGLObjects() );
tile->setTerrainTechnique( terrain->cloneTechnique() );
tile->setVerticalScale( _terrainOptions.verticalScale().value() );
tile->setDataVariance( osg::Object::DYNAMIC );
//tile->setLocator( locator.get() );
// Attach an updatecallback to normalize the edges of TerrainTiles.
#if 0
if ( hasElevation && _terrainOptions.normalizeEdges().get() )
{
tile->setUpdateCallback(new TerrainTileEdgeNormalizerUpdateCallback());
tile->setDataVariance(osg::Object::DYNAMIC);
}
#endif
// Generate placeholder imagery and elevation layers. These "inherit" data from an
// ancestor tile.
{
//Threading::ScopedReadLock parentLock( ancestorTile->getTileLayersMutex() );
addPlaceholderImageLayers ( tile, ancestorTile.get() );
addPlaceholderHeightfieldLayer( tile, ancestorTile.get(), locator.get(), key, ancestorKey );
}
// calculate the switching distances:
osg::BoundingSphere bs = tile->getBound();
double max_range = 1e10;
double radius = bs.radius();
double min_range = radius * _terrainOptions.minTileRangeFactor().get();
// Set the skirt height of the heightfield
osgTerrain::HeightFieldLayer* hfLayer = static_cast<osgTerrain::HeightFieldLayer*>(tile->getElevationLayer());
if (!hfLayer)
{
OE_WARN << LC << "Warning: Couldn't get hfLayer for " << key.str() << std::endl;
}
hfLayer->getHeightField()->setSkirtHeight(radius * _terrainOptions.heightFieldSkirtRatio().get() );
// In a Plate Carre tesselation, scale the heightfield elevations from meters to degrees
if ( mapInfo.isPlateCarre() && hfLayer->getHeightField() )
HeightFieldUtils::scaleHeightFieldToDegrees( hfLayer->getHeightField() );
bool markTileLoaded = false;
if ( _terrainOptions.loadingPolicy()->mode().get() != LoadingPolicy::MODE_STANDARD )
{
markTileLoaded = true;
tile->setHasElevationHint( hasElevation );
}
// install a tile switcher:
tile->attachToTerrain( terrain );
//tile->setTerrain( terrain );
//terrain->registerTile( tile );
osg::Node* result = 0L;
// create a PLOD so we can keep subdividing:
osg::PagedLOD* plod = new osg::PagedLOD();
plod->setCenter( bs.center() );
plod->addChild( tile, min_range, max_range );
if ( key.getLevelOfDetail() < (unsigned int)getTerrainOptions().maxLOD().get() )
{
plod->setFileName( 1, createURI( _engineId, key ) ); //map->getId(), key ) );
plod->setRange( 1, 0.0, min_range );
}
else
{
plod->setRange( 0, 0, FLT_MAX );
}
#if 0 //USE_FILELOCATIONCALLBACK
osgDB::Options* options = new osgDB::Options;
options->setFileLocationCallback( new FileLocationCallback);
plod->setDatabaseOptions( options );
#endif
result = plod;
// Install a callback that will load the actual tile data via the pager.
result->addCullCallback( new PopulateStreamingTileDataCallback( _cull_thread_mapf ) );
// Install a cluster culler (FIXME for cube mode)
//bool isCube = map->getMapOptions().coordSysType() == MapOptions::CSTYPE_GEOCENTRIC_CUBE;
if ( mapInfo.isGeocentric() && !mapInfo.isCube() )
{
osg::ClusterCullingCallback* ccc = createClusterCullingCallback( tile, locator->getEllipsoidModel() );
result->addCullCallback( ccc );
}
return result;
}
