美国海军（NPS）的OSG教程——示例代码一

//OSG 3.2版本osg::Group *root = new osg::Group();osg::Geode *pyramidGeode = new osg::Geode();deprecated_osg::Geometry *pyramidGeometry = new deprecated_osg::Geometry();//注意，用deprecated_osg，某些功能以后可能去掉pyramidGeode->addDrawable( pyramidGeometry );root->addChild( pyramidGeode );//定义点osg::Vec3Array *pyramidVertices = new osg::Vec3Array();pyramidVertices->push_back( osg::Vec3(0,0,0) );//左前pyramidVertices->push_back( osg::Vec3(10,0,0) );//右前pyramidVertices->push_back( osg::Vec3(10,10,0) );//右后pyramidVertices->push_back( osg::Vec3(0,10,0) );//左后pyramidVertices->push_back( osg::Vec3(5,5,10) );//塔尖pyramidGeometry->setVertexArray( pyramidVertices );//定义面osg::DrawElementsUInt *pyramidBase = new osg::DrawElementsUInt( osg::PrimitiveSet::QUADS, 0 );pyramidBase->push_back(3);pyramidBase->push_back(2);pyramidBase->push_back(1);pyramidBase->push_back(0);pyramidGeometry->addPrimitiveSet( pyramidBase );osg::DrawElementsUInt *pyramidFaceOne = new osg::DrawElementsUInt( osg::PrimitiveSet::TRIANGLES, 0 );pyramidFaceOne->push_back(0);pyramidFaceOne->push_back(1);pyramidFaceOne->push_back(4);pyramidGeometry->addPrimitiveSet( pyramidFaceOne );osg::DrawElementsUInt *pyramidFaceTwo = new osg::DrawElementsUInt( osg::PrimitiveSet::TRIANGLES, 0 );pyramidFaceTwo->push_back(1);pyramidFaceTwo->push_back(2);pyramidFaceTwo->push_back(4);pyramidGeometry->addPrimitiveSet( pyramidFaceTwo );osg::DrawElementsUInt *pyramidFaceThree = new osg::DrawElementsUInt( osg::PrimitiveSet::TRIANGLES, 0 );pyramidFaceThree->push_back(2);pyramidFaceThree->push_back(3);pyramidFaceThree->push_back(4);pyramidGeometry->addPrimitiveSet( pyramidFaceThree );osg::DrawElementsUInt *pyramidFaceFour = new osg::DrawElementsUInt( osg::PrimitiveSet::TRIANGLES, 0 );pyramidFaceFour->push_back(3);pyramidFaceFour->push_back(0);pyramidFaceFour->push_back(4);pyramidGeometry->addPrimitiveSet( pyramidFaceFour );//定义颜色osg::Vec4Array *colors = new osg::Vec4Array;colors->push_back( osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f) );//红色colors->push_back( osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f) );//绿色colors->push_back( osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f) );//蓝色colors->push_back( osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f) );//白色osg::TemplateIndexArray< unsigned int, osg::Array::UIntArrayType, 4, 4 > *colorIndexArray;colorIndexArray = new osg::TemplateIndexArray< unsigned int, osg::Array::UIntArrayType, 4, 4 >;colorIndexArray->push_back(0);colorIndexArray->push_back(1);colorIndexArray->push_back(2);colorIndexArray->push_back(3);colorIndexArray->push_back(0);pyramidGeometry->setColorArray( colors );pyramidGeometry->setColorIndices( colorIndexArray );pyramidGeometry->setColorBinding( deprecated_osg::Geometry::BIND_PER_VERTEX );osg::Vec2Array *texcoords = new osg::Vec2Array(5);(*texcoords)[0].set(0.00f,0.0f);(*texcoords)[1].set(0.25f,0.0f);(*texcoords)[2].set(0.50f,0.0f);(*texcoords)[3].set(0.75f,0.0f);(*texcoords)[4].set(0.50f,1.0f);pyramidGeometry->setTexCoordArray(0, texcoords);//必须加osgUtil::Optimizer optimizer ;optimizer.optimize(root) ;osgViewer::Viewer viewer;viewer.setSceneData(root);//初始化并创建窗口//viewer.realize();viewer.run();