3D项目处理点选操作步骤

 1、用notepad++模型的obj格式文件，查找到模型各个部分的名称，命名规则：g mesh......，把名字改为规则命名。

 2、选择处理

#ifdef _DEBUG
#pragma comment(lib,"osgGAd.lib")
#pragma comment(lib,"osgViewerd.lib")
#pragma comment(lib,"osgDBd.lib")
#pragma comment(lib,"OpenThreadsd.lib")
#pragma comment(lib,"osgd.lib")
#pragma comment(lib,"osgWidgetd.lib")
#pragma comment(lib,"osgTextd.lib")
#pragma comment(lib,"osgManipulatord.lib")
#pragma comment(lib,"osgUtild.lib")
#pragma comment(lib,"osgParticled.lib")
#else
#pragma comment(lib,"osgGA.lib")
#pragma comment(lib,"osgViewer.lib")
#pragma comment(lib,"osgDB.lib")
#pragma comment(lib,"OpenThreads.lib")
#pragma comment(lib,"osg.lib")
#pragma comment(lib,"osgWidget.lib")
#pragma comment(lib,"osgText.lib")
#pragma comment(lib,"osgManipulator.lib")
#pragma comment(lib,"osgUtil.lib")
#pragma comment(lib,"osgParticle.lib")
#endif
#include <osgViewer/Viewer>
#include <osgGA/GUIEventHandler>
#include <osg/Group>
#include <osg/MatrixTransform>
#include <osg/Material>
#include <osgDB/ReadFile>
#include <osgUtil/LineSegmentIntersector>
#include <osg/ShapeDrawable>
#include <osgText/Text>
#include <vector>
osg::ref_ptr<osg::Node> cow;
class CPickHandler : public osgGA::GUIEventHandler{
 osgViewer::Viewer * mViewer;
 osg::Group * mGroup;
 osg::Node * lastSelect;
public:
 CPickHandler(osgViewer::Viewer * viewer, osg::Group *group) :mViewer(viewer),mGroup(group),lastSelect(0){}
 virtual bool handle(const osgGA::GUIEventAdapter & ea, osgGA::GUIActionAdapter & aa){
  switch(ea.getEventType()){
  case(osgGA::GUIEventAdapter::PUSH):{
   if(lastSelect){
    //osg::StateSet * state = lastSelect->getOrCreateStateSet();
    //state->setMode(GL_BLEND, osg::StateAttribute::ON);
    /*osg::ref_ptr<osg::Material> material = new osg::Material();
    material->setTransparency(osg::Material::FRONT_AND_BACK, 1.0);
    material->setEmission(osg::Material::FRONT_AND_BACK, osg::Vec4(1.0,0.0,0.0,1.0));
    alarmSphere->getOrCreateStateSet()->setAttributeAndModes(material,osg::StateAttribute::ON);*/
    //osg::Material * mtrl = dynamic_cast<osg::Material *>(state->getAttribute(osg::StateAttribute::MATERIAL));
    //mtrl->setEmission(osg::Material::FRONT_AND_BACK, osg::Vec4(1.0, 1.0, 1.0, 1.0));
    //state->setAttributeAndModes(mtrl, osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);
    //state->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
    lastSelect = 0;
   }
   Pick(ea.getX(),ea.getY());      //获得单击的鼠标坐标
             }
             return true;
  }
  return false;
 }
protected:
 void Pick(float x, float y){      在pick函数中写触发函数
  osgUtil::LineSegmentIntersector::Intersections intersections;
  if(mViewer->computeIntersections(x, y, intersections)){
   for(osgUtil::LineSegmentIntersector::Intersections::iterator hitr = intersections.begin(); hitr!= intersections.end(); ++hitr){
    if(!hitr->nodePath.empty() && !(hitr->nodePath.back()->getName().empty())){
     const osg::NodePath& np = hitr->nodePath;
     for(int i = np.size() - 1; i >= 0; --i){
      osg::Node* nd = dynamic_cast<osg::Node *> (np[i]);
      if(nd){
       //std::cout<< "************"<<std::endl;
       std::cout << nd->getName() <<std::endl;
       std::cout << np.size() <<std::endl;
       if(nd->getName()=="Mesh12 Group4 Group1 Model"||nd->getName() == "Mesh18 Group6 Group1 Model"||nd->getName() == "Mesh6 Group2 Group1 Model"||nd->getName() == "Mesh16 Group6 Group1 Model"||nd->getName() == "Mesh10 Group4 Group1 Model"||nd->getName() == "Mesh4 Group2 Group1 Model"){
        //osg::StateSet * state = nd->getOrCreateStateSet();
        //state->setMode(GL_BLEND, osg::StateAttribute::ON);
        //osg::Material *mtrl = dynamic_cast<osg::Material *>(state->getAttribute(osg::StateAttribute::MATERIAL));
        //if(!mtrl){
         //mtrl = new osg::Material;
        //}
        //osg::ref_ptr<osg::Material> material = new osg::Material();
        //material->setTransparency(osg::Material::FRONT_AND_BACK, 0.5);
        //material->setEmission(osg::Material::FRONT_AND_BACK, osg::Vec4(1.0,0.0,0.0,1.0));
        //alarmSphere->getOrCreateStateSet()->setAttributeAndModes(material,osg::StateAttribute::ON);
        ////nd->setNodeMask(false);
        //mtrl->setEmission(osg::Material::FRONT_AND_BACK, osg::Vec4(1.0, 0.0, 0.0, 1.0));
        //state->setAttributeAndModes(mtrl, osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);
        //state->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
        osg::Vec3 eye, center, up;                                                   //改变视角代码段
        center = cow->computeBound()._center;
        eye = center;
        eye[0] += cow->computeBound()._radius * 3;
        up.set( 0.f, 0.f, 1.f );
        osg::Matrix mt;
        mt.makeLookAt( eye, center, up );
        mViewer->getCameraManipulator()->setByInverseMatrix( mt );             
        lastSelect = nd;
       }
       return ;
      }
     }
    }
   }
  }
  return ;
 }
};
void main(){
 osgViewer::Viewer viewer;
 osg::ref_ptr<osg::Group> root = new osg::Group();
 osg::ref_ptr<osg::MatrixTransform> mt = new osg::MatrixTransform;
 cow = osgDB::readNodeFile("D:\information of buaa\LAST CHANCE\lab\NewModels\toUse\pipelineTeam_3_boiler2\pipelineTeam1.ive");
 //osg::ref_ptr<osg::Node> cow = osgDB::readNodeFile("cow.osg");
 cow->setName("officeBuilding");
 mt->addChild(cow);
 mt->setName("officeBuilding");
 root->addChild(mt);
 //root->getChild(0);
 //std::cout<< root->getChild(2)->getName() << std::endl;
 /*osg::ref_ptr<osg::MatrixTransform> mtRobot = new osg::MatrixTransform;
 osg::ref_ptr<osg::Node> robot = osgDB::readNodeFile("robot.osg");
 mtRobot->setMatrix(osg::Matrix::translate(20,0,0));
 robot->setName("robot");
 mtRobot->addChild(robot);
 root->addChild(mtRobot);*/
 //std::cout << root->getChild(0)->getName() << std::endl;
 //osg::ref_ptr<osg::Plane> Plane (new osg::Plane());
 /*osg::ShapeDrawable *shapeBall=new osg::ShapeDrawable(new osg::Box(mt->computeBound()._center, mt->computeBound()._radius/3, mt->computeBound()._radius/10, mt->computeBound()._radius/3));
 osg::ref_ptr<osg::Material> material = new osg::Material();
 material->setTransparency(osg::Material::FRONT_AND_BACK, 1.0);
 material->setEmission(osg::Material::FRONT_AND_BACK, osg::Vec4(1.0,0.0,0.0,1.0));
 alarmSphere->getOrCreateStateSet()->setAttributeAndModes(material,osg::StateAttribute::ON);
 alarmSphere->getOrCreateStateSet()->setMode(GL_BLEND,osg::StateAttribute::ON);
 alarmSphere->getOrCreateStateSet()->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
 alarmSphere->addDrawable(shapeBall);
 root->addChild(alarmSphere);
 */
 viewer.setSceneData(root.get());
 viewer.addEventHandler(new CPickHandler(&viewer, root));
 viewer.realize();
 viewer.run();
 return ;
}