osg 自定义图元

osg::ref_ptr<osg::Geode> OSG_Qt_::createBox()
{
    osg::ref_ptr<osg::Geode> osg_geode = new osg::Geode;
    osg::ref_ptr<osg::TessellationHints> osg_hints = new osg::TessellationHints;
    osg::ref_ptr<osg::Box> osg_box = new osg::Box(osg::Vec3(0.0, 0.0, 0.0), 1.0, 0.5, 3.0);
    osg::ref_ptr<osg::ShapeDrawable> osg_shapedrawable = new osg::ShapeDrawable(osg_box,osg_hints.get());

    //设置颜色
    osg::ref_ptr<osg::Material> osg_material = new osg::Material;
    osg_material->setAmbient(osg::Material::FRONT_AND_BACK,osg::Vec4(1.0,1.0,1.0,1.0));
    osg_material->setDiffuse(osg::Material::FRONT_AND_BACK, osg::Vec4(1.0, 1.0, 1.0, 1.0));
    osg_material->setSpecular(osg::Material::FRONT_AND_BACK, osg::Vec4(1.0, 1.0, 1.0, 1.0));
    osg_material->setShininess(osg::Material::FRONT_AND_BACK,60.0);

    //应用材质
    osg_geode->getOrCreateStateSet()->setAttributeAndModes(osg_material.get(),osg::StateAttribute::ON);
    //设置透明度
    osg_geode->getOrCreateStateSet()->setMode(GL_BLEND,osg::StateAttribute::ON);

    //设置精度
    osg_hints->setDetailRatio(0.5);
    osg_geode->addDrawable(osg_shapedrawable.get());
    return osg_geode;
}