void
TerrainTileModelFactory::addElevation(TerrainTileModel* model,
const Map* map,
const TileKey& key,
const CreateTileModelFilter& filter,
unsigned border,
ProgressCallback* progress)
{
// make an elevation layer.
OE_START_TIMER(fetch_elevation);
if (!filter.empty() && !filter.elevation().isSetTo(true))
return;
const osgEarth::ElevationInterpolation& interp =
map->getMapOptions().elevationInterpolation().get();
// Request a heightfield from the map.
osg::ref_ptr<osg::HeightField> mainHF;
osg::ref_ptr<NormalMap> normalMap;
bool hfOK = getOrCreateHeightField(map, key, SAMPLE_FIRST_VALID, interp, border, mainHF, normalMap, progress) && mainHF.valid();
if (hfOK == false && key.getLOD() == _options.firstLOD().get())
{
OE_DEBUG << LC << "No HF at key " << key.str() << ", making placeholder" << std::endl;
mainHF = new osg::HeightField();
mainHF->allocate(1, 1);
mainHF->setHeight(0, 0, 0.0f);
hfOK = true;
}
if (hfOK && mainHF.valid())
{
osg::ref_ptr<TerrainTileElevationModel> layerModel = new TerrainTileElevationModel();
layerModel->setHeightField( mainHF.get() );
// pre-calculate the min/max heights:
for( unsigned col = 0; col < mainHF->getNumColumns(); ++col )
{
for( unsigned row = 0; row < mainHF->getNumRows(); ++row )
{
float h = mainHF->getHeight(col, row);
if ( h > layerModel->getMaxHeight() )
layerModel->setMaxHeight( h );
if ( h < layerModel->getMinHeight() )
layerModel->setMinHeight( h );
}
}
// needed for normal map generation
model->heightFields().setNeighbor(0, 0, mainHF.get());
// convert the heightfield to a 1-channel 32-bit fp image:
ImageToHeightFieldConverter conv;
osg::Image* hfImage = conv.convertToR32F(mainHF.get());
if ( hfImage )
{
// Made an image, so store this as a texture with no matrix.
osg::Texture* texture = createElevationTexture( hfImage );
layerModel->setTexture( texture );
model->elevationModel() = layerModel.get();
}
if (normalMap.valid())
{
TerrainTileImageLayerModel* layerModel = new TerrainTileImageLayerModel();
layerModel->setName( "oe_normal_map" );
// Made an image, so store this as a texture with no matrix.
osg::Texture* texture = createNormalTexture(normalMap.get());
layerModel->setTexture( texture );
model->normalModel() = layerModel;
}
}
if (progress)
progress->stats()["fetch_elevation_time"] += OE_STOP_TIMER(fetch_elevation);
}
