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使用Scribe特效实现白色轮廓，此类在osgFx模块里面。
所有场景中的节点全部添加Scribe特效。
通过继承GUIEventHandler来自定义鼠标对应动作时，需要进行何种操作。
在事件处理器类中，实现左键时判断鼠标点击位置是否和节点相交，然后隐藏特效；
右键时恢复特效。
判断是否相交，使用computeIntersections来计算，这是osgViewer的函数。
完整代码：
#include <osg/Group>
#include <osgViewer/Viewer>
#include <osgGA/GUIEventHandler>
#include <osg/ShapeDrawable>
#include <osgFX/Scribe>
#include <osg/Node>
#include <osgDB/ReadFile>#pragma comment(lib,"osgd.lib")
#pragma comment(lib,"osgviewerd.lib")
#pragma comment(lib,"osgFXd.lib")
#pragma comment(lib,"osggad.lib")
#pragma comment(lib,"osgUtild.lib")
#pragma comment(lib,"osgdbd.lib")class CEventHandler :public osgGA::GUIEventHandler
{
public:CEventHandler(osgViewer::Viewer *viewer) :m_pThis(viewer){};virtual bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& ga){switch (ea.getEventType()){case osgGA::GUIEventAdapter::PUSH:Pick(ea.getX(), ea.getY(), ea.getButton());break;default:break;}return true;}protected:void Pick(float x, float y,int button){osgUtil::LineSegmentIntersector::Intersections datas;if (button == 1 && m_pThis->computeIntersections(x, y, datas))//左键隐藏{for (auto it = datas.begin(); it != datas.end();it++){osg::NodePath nodePath = it->nodePath;for (int i = 0; i < nodePath.size(); i++){osgFX::Scribe *sc = dynamic_cast<osgFX::Scribe*>(nodePath[i]);if (sc){auto it = std::find(m_scribeList.begin(), m_scribeList.end(), sc);if (it != m_scribeList.end())continue;sc->setNodeMask(0);m_scribeList.push_back(sc);}}}}else if (button == 4)//右键显示{for (auto it = m_scribeList.begin(); it != m_scribeList.end();it++)it->get()->setNodeMask(1);m_scribeList.clear();}}osgViewer::Viewer* m_pThis;osg::NodeList m_scribeList;
};int main(int argc, char **argv)
{osgViewer::Viewer viewer;osg::ref_ptr<osg::Group> group = new osg::Group;osg::ref_ptr<osg::ShapeDrawable> coneDraw = new osg::ShapeDrawable(new osg::Cone(osg::Vec3(10.f, 0.f, 0.f), 2.f, 40.f));osg::ref_ptr<osg::ShapeDrawable> sphereDraw = new osg::ShapeDrawable(new osg::Sphere(osg::Vec3(-10.f, 0.f, 0.f), 2.f));osg::ref_ptr<osgFX::Scribe> scribe1 = new osgFX::Scribe;osg::ref_ptr<osg::Node> node1 = osgDB::readNodeFile("cessna.osgt");//scribe1->setNodeMask(0);scribe1->addChild(node1);osg::ref_ptr<osgFX::Scribe> scribe2 = new osgFX::Scribe;osg::ref_ptr<osg::Node> node2 = osgDB::readNodeFile("cow.osgt");//scribe2->setNodeMask(0);scribe2->addChild(node2);group->addChild(node1);group->addChild(node2);group->addChild(scribe1);group->addChild(scribe2);viewer.setSceneData(group);viewer.addEventHandler(new CEventHandler(&viewer));viewer.realize();return viewer.run();
}
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