osg模型重写

setlocale(LC_ALL,"chs");

osg::Group* pRoot = new osg::Group;

osg::Node*pNode = osgDB::readNodeFile("F:\\三维数据\\HY15\\现状\\现状建筑\\XZJZ01\\SubIve\\Level1\\sub1.osg");

pRoot->addChild(pNode);

osg::ref_ptr<osg::Geode> geode = dynamic_cast<osg::Geode*>(pNode);

int num = geode->getNumDrawables();

osg::ref_ptr<osg::Geometry> mGeometry =new osg::Geometry();

mGeometry->setDataVariance( osg::Object::DYNAMIC );

osg::StateSet* stateset = new osg::StateSet;

osg::Material *pMaterial = new osg::Material;

pMaterial->setAmbient(osg::Material::FRONT_AND_BACK, osg::Vec4(osg::Vec4(0.0, 0.0, 0.0, 1.0)));

pMaterial->setDiffuse(osg::Material::FRONT_AND_BACK, osg::Vec4(osg::Vec4(0.0, 0.0, 0.0, 1.0)));

pMaterial->setSpecular(osg::Material::FRONT_AND_BACK, osg::Vec4(osg::Vec4(0.0, 0.0, 0.0, 1.0)));

pMaterial->setEmission(osg::Material::FRONT_AND_BACK, osg::Vec4(osg::Vec4(1.0, 1.0, 1.0, 1.0)));

pMaterial->setShininess(osg::Material::FRONT_AND_BACK, 0.0f);

stateset->setAttribute(pMaterial);

mGeometry->setStateSet(stateset);

osg::ref_ptr<osg::Vec3Array > mVertexArray = new osg::Vec3Array();

osg::ref_ptr<osg::Vec3Array > mNormalArray = new osg::Vec3Array();

stateset->setMode( GL_LIGHTING, osg::StateAttribute::ON );

stateset->setMode( GL_CULL_FACE, osg::StateAttribute::ON );

int t =0;

int vectorNum = 0;

for (int i =0;i<num;i++)

{

osg::ref_ptr<osg::Geometry> pGeometry= dynamic_cast<osg::Geometry*>(geode->getDrawable(i));

osg::StateSet* ss = pGeometry->getStateSet();

osg::StateSet::TextureAttributeList texAbl = ss->getTextureAttributeList();

for(osg::StateSet::TextureAttributeList::size_type i=0; i<texAbl.size(); ++i)

{

osg::StateAttribute* sa = ss->getTextureAttribute(i, osg::StateAttribute::TEXTURE);

osg::Texture2D* tex2d = dynamic_cast<osg::Texture2D*>(sa);

if(tex2d==NULL)continue;

stateset->setTextureAttributeAndModes(t,tex2d,osg::StateAttribute::ON);

mGeometry->setTexCoordArray(t,pGeometry->getTexCoordArray(i));

t++;

}

for (int j =0;j<pGeometry->getNumPrimitiveSets();j++)

{

if (pGeometry->getPrimitiveSet(j)->getType() == osg::PrimitiveSet::DrawElementsUShortPrimitiveType )

{

osg::DrawElementsUShort*ss1 = dynamic_cast<osg::DrawElementsUShort*> (pGeometry->getPrimitiveSet(j));

if (ss1)

{

for (int p =0 ;p<ss1->getNumIndices();p++)

{

if (ss1)

{

int Primitive = ss1->getElement(p)+vectorNum;

//std::cout<<Primitive<<std::endl;

ss1->setElement(p,Primitive);

}

}

mGeometry->addPrimitiveSet(pGeometry->getPrimitiveSet(j));

}

}

else if (pGeometry->getPrimitiveSet(j)->getType() == osg::PrimitiveSet::DrawArraysPrimitiveType)

{

osg::DrawArrays*ss1 = dynamic_cast<osg::DrawArrays*> (pGeometry->getPrimitiveSet(j));

if (ss1)

{

int Primitive = ss1->getFirst()+vectorNum;//

ss1->setFirst(Primitive);

mGeometry->addPrimitiveSet(pGeometry->getPrimitiveSet(j));

}

}

}

mGeometry->setNormalBinding(pGeometry->getNormalBinding());

int v =0;

osg::Vec3Array * pVertexArray = (osg::Vec3Array*)(pGeometry->getVertexArray());

vectorNum +=pVertexArray->size();

for (v = 0;v<pVertexArray->size();v++)

{

mVertexArray->push_back(pVertexArray->at(v));

}

osg::Vec3Array * pNormalArray = (osg::Vec3Array*)(pGeometry->getNormalArray());

for (v = 0;v<pNormalArray->size();v++)

{

mNormalArray->push_back(pNormalArray->at(v));

}

}

mGeometry->setVertexArray(mVertexArray);

mGeometry->setNormalArray(mNormalArray);

geode->removeDrawables(0,num);//删掉原始结点

geode->addDrawable(mGeometry.get());

osgDB::writeNodeFile((*geode),"F:\\三维数据\\HY15\\现状\\现状建筑\\XZJZ01\\SubIve\\Level1\\sub1.osg");

===============================

思路：将多个geometry合并成一个geometry，用primitiveset控制形状