#include "osg/LOD"#include <osg/io_utils>#include "osgDB/Registry"#include "osgDB/Input"#include "osgDB/Output"using namespace osg;using namespace osgDB;// forward declare functions to use later.bool LOD_readLocalData(Object& obj, Input& fr);bool LOD_writeLocalData(const Object& obj, Output& fw);// register the read and write functions with the osgDB::Registry.RegisterDotOsgWrapperProxy g_LODProxy(    new osg::LOD,    "LOD",    "Object Node LOD Group",    &LOD_readLocalData,    &LOD_writeLocalData);bool LOD_readLocalData(Object& obj, Input& fr){    bool iteratorAdvanced = false;    LOD& lod = static_cast<LOD&>(obj);    if (fr.matchSequence("Center %f %f %f"))    {        Vec3 center;        fr[1].getFloat(center[0]);        fr[2].getFloat(center[1]);        fr[3].getFloat(center[2]);        lod.setCenter(center);        iteratorAdvanced = true;        fr+=4;    }    float radius;    if (fr[0].matchWord("Radius") && fr[1].getFloat(radius))    {        lod.setRadius(radius);        fr+=2;        iteratorAdvanced = true;    }    if(fr[0].matchWord("RangeMode")){      if(fr[1].matchWord("DISTANCE_FROM_EYE_POINT")){        lod.setRangeMode(osg::LOD::DISTANCE_FROM_EYE_POINT);      }      else {        lod.setRangeMode(osg::LOD::PIXEL_SIZE_ON_SCREEN);      }      fr+=2;      iteratorAdvanced = true;    }            // For backwards compatibility with old style LOD's (pre October 2002).    bool matchFirst = false;    if ((matchFirst=fr.matchSequence("Ranges {")) || fr.matchSequence("Ranges %i {"))    {        // set up coordinates.        int entry = fr[0].getNoNestedBrackets();        if (matchFirst)        {            fr += 2;        }        else        {            fr += 3;        }        float minRange=0.0;        float maxRange=0.0;        unsigned int i=0;        while (!fr.eof() && fr[0].getNoNestedBrackets()>entry)        {            if (fr[0].getFloat(maxRange))            {                if (i>0) lod.setRange(i-1,minRange,maxRange);                ++fr;                ++i;                minRange = maxRange;            }            else            {                ++fr;            }        }        iteratorAdvanced = true;        ++fr;    }    if ((matchFirst=fr.matchSequence("RangeList {")) || fr.matchSequence("RangeList %i {"))    {        // set up coordinates.        int entry = fr[0].getNoNestedBrackets();        if (matchFirst)        {            fr += 2;        }        else        {            fr += 3;        }        float minRange=0.0;        float maxRange=0.0;        unsigned int i=0;        while (!fr.eof() && fr[0].getNoNestedBrackets()>entry)        {            if (fr[0].getFloat(minRange) && fr[1].getFloat(maxRange) )            {                lod.setRange(i,minRange,maxRange);                fr+=2;                ++i;            }            else            {                ++fr;            }        }        iteratorAdvanced = true;        ++fr;    }    return iteratorAdvanced;}bool LOD_writeLocalData(const Object& obj, Output& fw){    const LOD& lod = static_cast<const LOD&>(obj);    if (lod.getCenterMode()==osg::LOD::USER_DEFINED_CENTER) fw.indent() << "Center "<< lod.getCenter() << std::endl;    fw.indent() << "Radius "<<lod.getRadius()<<std::endl;    if(lod.getRangeMode()==osg::LOD::DISTANCE_FROM_EYE_POINT){      fw.indent() << "RangeMode DISTANCE_FROM_EYE_POINT"<<std::endl;    }    else {      fw.indent() << "RangeMode PIXEL_SIZE_ON_SCREEN"<<std::endl;    }        fw.indent() << "RangeList "<<lod.getNumRanges()<<" {"<< std::endl;    fw.moveIn();        for(unsigned int i=0; i<lod.getNumRanges();++i)    {        fw.indent() << lod.getMinRange(i) << " "<<lod.getMaxRange(i)<<std::endl;    }    fw.moveOut();    fw.indent() << "}"<< std::endl;    return true;}