TileNode*
TileGroup::getTileNode(unsigned q)
{
osg::Node* child = getChild(q);
TilePagedLOD* plod = dynamic_cast<TilePagedLOD*>( child );
if ( plod ) return plod->getTileNode();
return static_cast<TileNode*>( child );
}
void
MPTerrainEngineNode::createTerrain()
{
// scrub the heightfield cache.
if (_tileModelFactory)
_tileModelFactory->getHeightFieldCache()->clear();
// New terrain
_terrain = new TerrainNode( _deadTiles.get() );
this->addChild( _terrain );
// Enable blending on the terrain node; this will result in the underlying
// "empty" globe being transparent instead of white.
if (_terrainOptions.enableBlending().value())
{
_terrain->getOrCreateStateSet()->setMode(GL_BLEND , osg::StateAttribute::ON);
}
// Factory to create the root keys:
KeyNodeFactory* factory = getKeyNodeFactory();
// Build the first level of the terrain.
// Collect the tile keys comprising the root tiles of the terrain.
std::vector< TileKey > keys;
_update_mapf->getProfile()->getAllKeysAtLOD( *_terrainOptions.firstLOD(), keys );
// create a root node for each root tile key.
OE_INFO << LC << "Creating " << keys.size() << " root keys.." << std::endl;
TilePagedLOD* root = new TilePagedLOD( _uid, _liveTiles, _deadTiles );
//osg::Group* root = new osg::Group();
_terrain->addChild( root );
osg::ref_ptr<osgDB::Options> dbOptions = Registry::instance()->cloneOrCreateOptions();
unsigned child = 0;
for( unsigned i=0; i<keys.size(); ++i )
{
osg::ref_ptr<osg::Node> node = factory->createNode( keys[i], true, 0L );
if ( node.valid() )
{
root->addChild( node.get() );
root->setRange( child++, 0.0f, FLT_MAX );
root->setCenter( node->getBound().center() );
root->setNumChildrenThatCannotBeExpired( child );
}
else
{
OE_WARN << LC << "Couldn't make tile for root key: " << keys[i].str() << std::endl;
}
}
_rootTilesRegistered = false;
updateShaders();
}
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;
}
//---------------------------------------------
//$$$
void MPTerrainEngineNode::_createTerrainTilePagedLOD()
{
// Factory to create the root keys:
KeyNodeFactory* factory = getKeyNodeFactory();
// Build the first level of the terrain.
// Collect the tile keys comprising the root tiles of the terrain.
std::vector< TileKey > keys;
_update_mapf->getProfile()->getAllKeysAtLOD( *_terrainOptions.firstLOD(), keys );
// create a root node for each root tile key.
OE_INFO << LC << "Creating " << keys.size() << " root keys.." << std::endl;
TilePagedLOD* root = new TilePagedLOD( _uid, _liveTiles, _deadTiles );
//osg::Group* root = new osg::Group();
osg::ref_ptr<osgDB::Options> dbOptions = Registry::instance()->cloneOrCreateOptions();
unsigned child = 0;
std::cout<<"MPTerrainEngineNode::refresh() ( @osgEarthDrivers\\..\\MPTerrainEngineNode.cpp ) : Begin create KeyNode"<<std::endl;//$$$
for( unsigned i=0; i<keys.size(); ++i )
{
osg::ref_ptr<osg::Node> node = factory->createNode( keys[i], true, true, 0L );//$$$这里消耗太多时间了！！阻塞了渲染线程。
if ( node.valid() )
{
root->addChild( node.get() );
root->setRange( child++, 0.0f, FLT_MAX );
root->setCenter( node->getBound().center() );
root->setNumChildrenThatCannotBeExpired( child );
}
else
{
OE_WARN << LC << "Couldn't make tile for root key: " << keys[i].str() << std::endl;
}
}
std::cout<<"After create KeyNode"<<std::endl;//$$$
osgX::StaticOSGViewerAssistant::dealWithUpdateOperation( new RefreshTerrainOperation( this, root ) );
}
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 );
}
}
void
TileGroup::applyUpdate(osg::Node* node)
{
if ( node )
{
OE_DEBUG << LC << "Update received for tile " << _key.str() << std::endl;
TileGroup* update = dynamic_cast<TileGroup*>( node );
if ( !update )
{
OE_WARN << LC << "Internal error: update was not a TileGroup" << std::endl;
return;
}
if ( update->getNumChildren() < 4 )
{
OE_WARN << LC << "Internal error: update did not have 4 children" << std::endl;
return;
}
for(unsigned i=0; i<4; ++i)
{
TileNode* newTileNode = dynamic_cast<TileNode*>( update->getChild(i) );
if ( !newTileNode )
{
OE_WARN << LC << "Internal error; update child was not a TileNode" << std::endl;
return;
}
osg::ref_ptr<TileNode> oldTileNode = 0L;
TilePagedLOD* plod = dynamic_cast<TilePagedLOD*>(_children[i].get());
if ( plod )
{
oldTileNode = plod->getTileNode();
plod->setTileNode( newTileNode );
if ( _live.valid() )
_live->move( oldTileNode.get(), _dead.get() );
}
else
{
// must be a TileNode leaf, so replace it here.
oldTileNode = dynamic_cast<TileNode*>(_children[i].get());
if ( !oldTileNode.valid() )
{
OE_WARN << LC << "Internal error; existing child was not a TilePagedLOD or a TileNode" << std::endl;
return;
}
this->setChild( i, newTileNode );
if ( _live.valid() )
_live->move( oldTileNode.get(), _dead.get() );
}
if ( _live.valid() )
_live->add( newTileNode );
}
}
// deactivate the update agent
_updateAgent = 0L;
}
void
MPTerrainEngineNode::dirtyTerrain()
{
// scrub the heightfield cache.
if (_tileModelFactory)
{
_tileModelFactory->clearCaches();
}
// remove existing:
if ( _terrain )
{
this->removeChild( _terrain );
}
// New terrain
_terrain = new TerrainNode( _deadTiles.get() );
#ifdef USE_RENDER_BINS
_terrain->getOrCreateStateSet()->setRenderBinDetails( 0, _terrainRenderBinPrototype->getName() );
_terrain->getOrCreateStateSet()->setNestRenderBins(false);
#else
_terrain->getOrCreateStateSet()->setRenderBinDetails(0, "SORT_FRONT_TO_BACK");
#endif
this->addChild( _terrain );
// Factory to create the root keys:
KeyNodeFactory* factory = getKeyNodeFactory();
// Build the first level of the terrain.
// Collect the tile keys comprising the root tiles of the terrain.
std::vector< TileKey > keys;
_update_mapf->getProfile()->getAllKeysAtLOD( *_terrainOptions.firstLOD(), keys );
// create a root node for each root tile key.
OE_INFO << LC << "Creating " << keys.size() << " root keys.." << std::endl;
TilePagedLOD* root = new TilePagedLOD( _uid, _liveTiles, _deadTiles );
_terrain->addChild( root );
osg::ref_ptr<osgDB::Options> dbOptions = Registry::instance()->cloneOrCreateOptions();
unsigned child = 0;
for( unsigned i=0; i<keys.size(); ++i )
{
osg::ref_ptr<osg::Node> node = factory->createNode( keys[i], true, true, 0L );
if ( node.valid() )
{
root->addChild( node.get() );
root->setRange( child++, 0.0f, FLT_MAX );
root->setCenter( node->getBound().center() );
root->setNumChildrenThatCannotBeExpired( child );
}
else
{
OE_WARN << LC << "Couldn't make tile for root key: " << keys[i].str() << std::endl;
}
}
_rootTilesRegistered = false;
updateState();
// Call the base class
TerrainEngineNode::dirtyTerrain();
}
osg::Node*
SingleKeyNodeFactory::createTile(TileModel* model,
bool setupChildrenIfNecessary,
ProgressCallback* progress)
{
#ifdef EXPERIMENTAL_TILE_NODE_CACHE
osg::ref_ptr<TileNode> tileNode;
TileNodeCache::Record rec;
cache.get(model->_tileKey, rec);
if ( rec.valid() )
{
tileNode = rec.value().get();
}
else
{
tileNode = _modelCompiler->compile( model, _frame );
cache.insert(model->_tileKey, tileNode);
}
#else
// compile the model into a node:
TileNode* tileNode = _modelCompiler->compile(model, _frame, progress);
#endif
// see if this tile might have children.
bool prepareForChildren =
setupChildrenIfNecessary &&
model->_tileKey.getLOD() < *_options.maxLOD();
osg::Node* result = 0L;
if ( prepareForChildren )
{
osg::BoundingSphere bs = tileNode->getBound();
TilePagedLOD* plod = new TilePagedLOD( _engineUID, _liveTiles, _deadTiles );
plod->setCenter ( bs.center() );
plod->addChild ( tileNode );
plod->setFileName( 1, Stringify() << tileNode->getKey().str() << "." << _engineUID << ".osgearth_engine_mp_tile" );
if ( _options.rangeMode().value() == osg::LOD::DISTANCE_FROM_EYE_POINT )
{
//Compute the min range based on the 2D size of the tile
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());
plod->setRange( 0, minRange, FLT_MAX );
plod->setRange( 1, 0, minRange );
plod->setRangeMode( osg::LOD::DISTANCE_FROM_EYE_POINT );
}
else
{
plod->setRange( 0, 0.0f, _options.tilePixelSize().value() );
plod->setRange( 1, _options.tilePixelSize().value(), FLT_MAX );
plod->setRangeMode( osg::LOD::PIXEL_SIZE_ON_SCREEN );
}
// DBPager will set a priority based on the ratio range/maxRange.
// This will offset that number with a full LOD #, giving LOD precedence.
// Experimental.
//plod->setPriorityScale( 1, model->_tileKey.getLOD()+1 );
#if USE_FILELOCATIONCALLBACK
osgDB::Options* options = plod->getOrCreateDBOptions();
options->setFileLocationCallback( new FileLocationCallback() );
#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;
}
osg::Node*
SingleKeyNodeFactory::createTile(TileModel* model,
bool setupChildrenIfNecessary,
ProgressCallback* progress)
{
#ifdef EXPERIMENTAL_TILE_NODE_CACHE
osg::ref_ptr<TileNode> tileNode;
TileNodeCache::Record rec;
cache.get(model->_tileKey, rec);
if ( rec.valid() )
{
tileNode = rec.value().get();
}
else
{
tileNode = _modelCompiler->compile( model, _frame );
cache.insert(model->_tileKey, tileNode);
}
#else
// compile the model into a node:
TileNode* tileNode = _modelCompiler->compile(model, _frame, progress);
tileNode->setEngineUID( _engineUID );
#endif
// see if this tile might have children.
bool prepareForChildren =
setupChildrenIfNecessary &&
model->_tileKey.getLOD() < *_options.maxLOD();
osg::Node* result = 0L;
if ( prepareForChildren )
{
osg::BoundingSphere bs = tileNode->getBound();
TilePagedLOD* plod = new TilePagedLOD( _engineUID, _liveTiles, _deadTiles );
plod->setCenter ( bs.center() );
plod->addChild ( tileNode );
plod->setFileName( 1, Stringify() << tileNode->getKey().str() << "." << _engineUID << ".osgearth_engine_mp_tile" );
plod->setDebug ( _debug );
if ( _options.rangeMode().value() == osg::LOD::DISTANCE_FROM_EYE_POINT )
{
//Compute the min range based on the 2D size of the tile
GeoExtent extent = model->_tileKey.getExtent();
double radius = 0.0;
#if 0
// Test code to use the equitorial radius so that all of the tiles at the same level
// have the same range. This will make the poles page in more appropriately.
if (_frame.getMapInfo().isGeocentric())
{
GeoExtent equatorialExtent(
extent.getSRS(),
extent.west(),
-extent.height()/2.0,
extent.east(),
extent.height()/2.0 );
radius = equatorialExtent.getBoundingGeoCircle().getRadius();
}
else
#endif
{
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 );
radius = (ur - ll).length() / 2.0;
}
float minRange = (float)(radius * _options.minTileRangeFactor().value());
plod->setRange( 0, minRange, FLT_MAX );
plod->setRange( 1, 0, minRange );
plod->setRangeMode( osg::LOD::DISTANCE_FROM_EYE_POINT );
}
else
{
// the *2 is because we page in 4-tile sets, not individual tiles.
float size = 2.0f * _options.tilePixelSize().value();
plod->setRange( 0, 0.0f, size );
plod->setRange( 1, size, FLT_MAX );
plod->setRangeMode( osg::LOD::PIXEL_SIZE_ON_SCREEN );
}
// Install a tile-aligned bounding box in the pager node itself so we can do
// visibility testing before paging in subtiles.
plod->setChildBoundingBoxAndMatrix(
1,
tileNode->getTerrainBoundingBox(),
tileNode->getMatrix() );
// DBPager will set a priority based on the ratio range/maxRange.
// This will offset that number with a full LOD #, giving LOD precedence.
// Experimental.
//plod->setPriorityScale( 1, model->_tileKey.getLOD()+1 );
#if USE_FILELOCATIONCALLBACK
osgDB::Options* options = plod->getOrCreateDBOptions();
options->setFileLocationCallback( new FileLocationCallback() );
#endif
result = plod;
// this one rejects back-facing tiles:
if ( _frame.getMapInfo().isGeocentric() && _options.clusterCulling() == true )
{
#if 1
osg::HeightField* hf =
model->_elevationData.getHeightField();
result->addCullCallback( HeightFieldUtils::createClusterCullingCallback(
hf,
tileNode->getKey().getProfile()->getSRS()->getEllipsoid(),
*_options.verticalScale() ) );
#else
// This works, but isn't quite as tight at the cluster culler.
// Re-evaluate down the road.
result->addCullCallback( new HorizonTileCuller(
_frame.getMapInfo().getSRS(),
tileNode->getTerrainBoundingBox(),
tileNode->getMatrix(), tileNode->getKey() ) );
#endif
}
}
else
{
result = tileNode;
}
return result;
}
osg::Node*
SingleKeyNodeFactory::createTile(TileModel* model,
bool setupChildrenIfNecessary,
ProgressCallback* progress)
{
#ifdef EXPERIMENTAL_TILE_NODE_CACHE
osg::ref_ptr<TileNode> tileNode;
TileNodeCache::Record rec;
cache.get(model->_tileKey, rec);
if ( rec.valid() )
{
tileNode = rec.value().get();
}
else
{
tileNode = _modelCompiler->compile( model, _frame );
cache.insert(model->_tileKey, tileNode);
}
#else
// compile the model into a node:
osg::ref_ptr<TileNode> tileNode = _modelCompiler->compile(model, _frame, progress);
#endif
// see if this tile might have children.
bool prepareForChildren =
setupChildrenIfNecessary &&
model->_tileKey.getLOD() < *_options.maxLOD();
osg::Node* result = 0L;
if ( prepareForChildren )
{
osg::BoundingSphere bs = tileNode->getBound();
TilePagedLOD* plod = new TilePagedLOD( _engine->getUID(), _liveTiles.get(), _releaser.get() );
plod->setCenter ( bs.center() );
plod->addChild ( tileNode.get() );
plod->setFileName( 1, Stringify() << tileNode->getKey().str() << "." << _engine->getUID() << ".osgearth_engine_mp_tile" );
double rangeFactor = _options.minTileRangeFactor().get();
//if (_options.adaptivePolarRangeFactor() == true)
//{
// double lat = model->_tileKey.getExtent().yMin() < 0 ? -model->_tileKey.getExtent().yMax() : model->_tileKey.getExtent().yMin();
// double latRad = osg::DegreesToRadians(lat);
// rangeFactor -= (rangeFactor - 1.0)*sin(latRad)*sin(latRad);
//}
plod->setRangeFactor(rangeFactor);
// Setup expiration.
if (_options.minExpiryFrames().isSet())
{
plod->setMinimumExpiryFrames(1, *_options.minExpiryFrames());
}
if (_options.minExpiryTime().isSet())
{
plod->setMinimumExpiryTime(1, *_options.minExpiryTime());
}
if ( _options.rangeMode().value() == osg::LOD::DISTANCE_FROM_EYE_POINT )
{
//Compute the min range based on the 2D size of the tile
GeoExtent extent = model->_tileKey.getExtent();
double radius = 0.0;
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 radiusDiag = (ur - ll).length() / 2.0;
if (_options.adaptivePolarRangeFactor() == true )
{
GeoPoint left(extent.getSRS(), extent.xMin(), extent.yMin()+extent.height()*0.5, 0.0, ALTMODE_ABSOLUTE);
GeoPoint right(extent.getSRS(), extent.xMax(), extent.yMin()+extent.height()*0.5, 0.0, ALTMODE_ABSOLUTE);
osg::Vec3d l, r;
left.toWorld(l);
right.toWorld(r);
double radiusHoriz = 1.4142 * (r - l).length() / 2.0;
double lat = model->_tileKey.getExtent().yMin() < 0 ? -model->_tileKey.getExtent().yMax() : model->_tileKey.getExtent().yMin();
double latRad = osg::DegreesToRadians(lat);
// mix between diagonal radius and horizontal radius based on latitude
double t = cos(latRad);
t = 1.0-(1.0-t)*(1.0-t); // decelerate t to weight the mix in favor of equator (diag radius)
radius = t*radiusDiag + (1.0-t)*radiusHoriz;
}
else
{
radius = radiusDiag;
}
float minRange = radius;
plod->setRange( 0, minRange, FLT_MAX );
plod->setRange( 1, 0, minRange );
plod->setRangeMode( osg::LOD::DISTANCE_FROM_EYE_POINT );
}
else
{
// the *2 is because we page in 4-tile sets, not individual tiles.
float size = 2.0f * _options.tilePixelSize().value();
plod->setRange( 0, 0.0f, size );
plod->setRange( 1, size, FLT_MAX );
plod->setRangeMode( osg::LOD::PIXEL_SIZE_ON_SCREEN );
}
// Install a tile-aligned bounding box in the pager node itself so we can do
// visibility testing before paging in subtiles.
plod->setChildBoundingBoxAndMatrix(
1,
tileNode->getTerrainBoundingBox(),
tileNode->getMatrix() );
// DBPager will set a priority based on the ratio range/maxRange.
// This will offset that number with a full LOD #, giving LOD precedence.
// Experimental.
//plod->setPriorityScale( 1, model->_tileKey.getLOD()+1 );
#if USE_FILELOCATIONCALLBACK
osgDB::Options* options = plod->getOrCreateDBOptions();
options->setFileLocationCallback( new FileLocationCallback() );
#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.release();
}
return result;
}
TileNode*
TileGroupFactory::createTileNodeGraph(TerrainTileModel* model,
bool setupChildrenIfNecessary,
ProgressCallback* progress)
{
// TODO: fix this
const unsigned tileSize = 17;
// Build the surface node.
SurfaceNodeFactory factory(model, _frame, _renderBindings, _geometryPool, tileSize, _options);
SurfaceNode* surfaceNode = factory.createSurfaceNode();
surfaceNode->setEngineUID( _terrainEngine->getUID() );
// see if this tile might have children.
bool prepareForChildren =
setupChildrenIfNecessary &&
model->getKey().getLOD() < *_options.maxLOD();
// Build the Tile Node that will hold all the textures and texture matrices.
TileNode* tileNode = createTileNode(
model,
progress );
// Build the paging node that will load subtiles, if necessary:
if ( prepareForChildren )
{
osg::BoundingSphere bs = surfaceNode->getBound();
TilePagedLOD* plod = new TilePagedLOD( _terrainEngine->getUID(), _liveTiles, _deadTiles );
plod->setCenter ( bs.center() );
plod->addChild ( surfaceNode );
plod->setFileName( 1, Stringify()
<< model->getKey().str()
<< "." << _terrainEngine->getUID()
<< ".osgearth_engine_mp_tile" );
if ( _options.rangeMode().value() == osg::LOD::DISTANCE_FROM_EYE_POINT )
{
//Compute the min range based on the 2D size of the tile
GeoExtent extent = model->getKey().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());
plod->setRange( 0, minRange, FLT_MAX );
plod->setRange( 1, 0, minRange );
plod->setRangeMode( osg::LOD::DISTANCE_FROM_EYE_POINT );
}
else
{
plod->setRange( 0, 0.0f, _options.tilePixelSize().value() );
plod->setRange( 1, _options.tilePixelSize().value(), FLT_MAX );
plod->setRangeMode( osg::LOD::PIXEL_SIZE_ON_SCREEN );
}
#if 0 // TODO: reinstate this!
// Install a tile-aligned bounding box in the pager node itself so we can do
// visibility testing before paging in subtiles.
plod->setChildBoundingBoxAndMatrix(
1,
surfaceNode->getTerrainBoundingBox(),
surfaceNode->getLocalToWorldMatrix() );
#endif
#if USE_FILELOCATIONCALLBACK
osgDB::Options* options = plod->getOrCreateDBOptions();
options->setFileLocationCallback( new FileLocationCallback() );
#endif
tileNode->addChild( plod );
// Install a callback to reject back-facing tiles.
if ( _frame.getMapInfo().isGeocentric() && _options.clusterCulling() == true )
{
const osg::HeightField* heightField = model->elevationModel()->getHeightField();
if ( heightField )
{
tileNode->addCullCallback( HeightFieldUtils::createClusterCullingCallback(
heightField,
tileNode->getKey().getProfile()->getSRS()->getEllipsoid(),
*_options.verticalScale() ) );
}
}
}
else
{
tileNode->addChild( surfaceNode );
}
return tileNode;
}
