Beispiel #1
0
    void apply(osg::PagedLOD& plod)
    {
        if (s_ExitApplication) return;

        ++_currentLevel;

        initBound();

        // first compute the bounds of this subgraph
        for(unsigned int i=0; i<plod.getNumFileNames(); ++i)
        {
            if (plod.getFileName(i).empty())
            {
                traverse(plod);
            }
        }

        if (intersects())
        {
            for(unsigned int i=0; i<plod.getNumFileNames(); ++i)
            {
                osg::notify(osg::INFO)<<"   filename["<<i<<"] "<<plod.getFileName(i)<<std::endl;
                if (!plod.getFileName(i).empty())
                {
                    std::string filename;
                    if (!plod.getDatabasePath().empty())
                    {
                        filename = plod.getDatabasePath() + plod.getFileName(i);
                    }
                    else
                    {
                        filename = plod.getFileName(i);
                    }


                    osg::ref_ptr<osg::Node> node = readNodeFileAndWriteToCache(filename);

                    if (!s_ExitApplication && node.valid()) node->accept(*this);
                }
            }
        }

        --_currentLevel;
    }
Beispiel #2
0
void IntersectionVisitor::apply(osg::PagedLOD& plod)
{
    if (!enter(plod)) return;

    if (plod.getNumFileNames()>0)
    {
#if 1
        // Identify the range value for the highest res child
        float targetRangeValue;
        if( plod.getRangeMode() == osg::LOD::DISTANCE_FROM_EYE_POINT )
            targetRangeValue = 1e6; // Init high to find min value
        else
            targetRangeValue = 0; // Init low to find max value
            
        const osg::LOD::RangeList rl = plod.getRangeList();
        osg::LOD::RangeList::const_iterator rit;
        for( rit = rl.begin();
             rit != rl.end();
             rit++ )
        {
            if( plod.getRangeMode() == osg::LOD::DISTANCE_FROM_EYE_POINT )
            {
                if( rit->first < targetRangeValue )
                    targetRangeValue = rit->first;
            }
            else
            {
                if( rit->first > targetRangeValue )
                    targetRangeValue = rit->first;
            }
        }

        // Perform an intersection test only on children that display
        // at the maximum resolution.
        unsigned int childIndex;
        for( rit = rl.begin(), childIndex = 0;
             rit != rl.end();
             rit++, childIndex++ )
        {
            if( rit->first != targetRangeValue )
                // This is not one of the highest res children
                continue;

            osg::ref_ptr<osg::Node> child( NULL );
            if( plod.getNumChildren() > childIndex )
                child = plod.getChild( childIndex );

            if( (!child.valid()) && (_readCallback.valid()) )
            {
                // Child is NULL; attempt to load it, if we have a readCallback...
                unsigned int validIndex( childIndex );
                if (plod.getNumFileNames() <= childIndex)
                    validIndex = plod.getNumFileNames()-1;

                child = _readCallback->readNodeFile( plod.getDatabasePath() + plod.getFileName( validIndex ) );
            }

            if ( !child.valid() && plod.getNumChildren()>0)
            {
                // Child is still NULL, so just use the one at the end of the list.
                child = plod.getChild( plod.getNumChildren()-1 );
            }

            if (child.valid())
            {
                child->accept(*this);
            }
        }
#else    
        // older code than above block, that assumes that the PagedLOD is ordered correctly
        // i.e. low res children first, no duplicate ranges.
        
        osg::ref_ptr<osg::Node> highestResChild;

        if (plod.getNumFileNames() != plod.getNumChildren() && _readCallback.valid())
        {
            highestResChild = _readCallback->readNodeFile( plod.getDatabasePath() + plod.getFileName(plod.getNumFileNames()-1) );
        }
        
        if ( !highestResChild.valid() && plod.getNumChildren()>0)
        {
            highestResChild = plod.getChild( plod.getNumChildren()-1 );
        }

        if (highestResChild.valid())
        {
            highestResChild->accept(*this);
        }
#endif
    }

    leave();
}