[osg-users] Billboarding 3D models loaded from a file

[Paul Leopard]

Just for info ... I've used the following to gain access to drawables within a 3D model :


Code:

struct GeodeInfo
{
   GeodeInfo() : m_drawable( 0 ) {}
   std::string m_geodeName;
   osg::Drawable* m_drawable;
}; // end struct GeodeInfo ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

struct InfoVisitor : public osg::NodeVisitor
{
   std::vector<GeodeInfo> m_infos;
    InfoVisitor()
    {
        setTraversalMode( osg::NodeVisitor::TRAVERSE_ALL_CHILDREN );
    }

    void apply( osg::Geode& geode )
    {
        for ( unsigned int i=0; i<geode.getNumDrawables(); ++i )
        {
         GeodeInfo gInfo;
         gInfo.m_geodeName = geode.getName();
         gInfo.m_drawable = geode.getDrawable( i );
         m_infos.push_back( gInfo );
        }
    }
}; // end struct InfoVisitor ~~~~~~~~~~~~~~~~~~~~~~~~

osg::ref_ptr<osg::Node> MakeTargetBB( const sgp_core::FileInfo& modelFile )
{
   if ( !modelFile.exists() )
   {
      ostringstream ostr;
      ostr << "OPM file does not exist : " << modelFile.filePath();
      SGP_THROW_MESSAGE( ostr.str() );
   }

   string modelFileName = modelFile.absoluteFilePath();
   osg::ref_ptr<osg::Node> rModelNode = osgDB::readNodeFile( modelFileName );
   if ( rModelNode.get() == 0 )
   {
      ostringstream os;
      os << "Failed loading target model : " << modelFile.filePath();
      SGP_THROW_MESSAGE( os.str() );
   }

   InfoVisitor infVis;
   rModelNode->accept( infVis );
   if ( infVis.m_infos.size() > 0 )
   {
      std::vector<GeodeInfo>::const_iterator iItr = infVis.m_infos.begin();
      cout << "Found drawable named : " << (*iItr).m_geodeName << endl;
   }

   return rModelNode;
} // end MakeTargetBB() ~~~~~~~~~~~~~~~~~~~




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things are more like they are now than they have ever been before

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http://forum.openscenegraph.org/viewtopic.php?p=66644#66644