一個簡單的OSG求交示例

#include <osgViewer/Viewer>
#include <osgViewer/ViewerEventHandlers> 
#include <osgViewer/CompositeViewer> 
#include <osgDB/ReadFile>
#include <osg/Geode>
#include <osg/Node>
#include <osg/ShapeDrawable>
#include <osgUtil/IntersectionVisitor>
#include <osgUtil/LineSegmentIntersector>

#ifdef _DEBUG
#pragma comment(lib, "OpenThreadsd.lib")
#pragma comment(lib, "osgd.lib")
#pragma comment(lib, "osgDBd.lib")
#pragma comment(lib, "osgFXd.lib")
#pragma comment(lib, "osgGAd.lib")
#pragma comment(lib, "osgManipulatord.lib")
#pragma comment(lib, "osgParticled.lib")
#pragma comment(lib, "osgShadowd.lib")
#pragma comment(lib, "osgSimd.lib")
#pragma comment(lib, "osgTerraind.lib")
#pragma comment(lib, "osgTextd.lib")
#pragma comment(lib, "osgUtild.lib")
#pragma comment(lib, "osgViewerd.lib")
#else
#pragma comment(lib, "OpenThreads.lib")
#pragma comment(lib, "osg.lib")
#pragma comment(lib, "osgDB.lib")
#pragma comment(lib, "osgFX.lib")
#pragma comment(lib, "osgGA.lib")
#pragma comment(lib, "osgManipulator.lib")
#pragma comment(lib, "osgParticle.lib")
#pragma comment(lib, "osgShadow.lib")
#pragma comment(lib, "osgSim.lib")
#pragma comment(lib, "osgTerrain.lib")
#pragma comment(lib, "osgText.lib")
#pragma comment(lib, "osgUtil.lib")
#pragma comment(lib, "osgViewer.lib")
#endif // DEBUG

int main()
{
	osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer;
	osg::ref_ptr<osg::Group> group = new osg::Group;

	osg::ref_ptr<osgUtil::LineSegmentIntersector> lineSegmentIntesector = new osgUtil::LineSegmentIntersector(osg::Vec3(0, 0, 15), osg::Vec3(0, 0, -15));
	osg::ref_ptr<osgUtil::IntersectionVisitor> intersectionVisitor = new osgUtil::IntersectionVisitor(lineSegmentIntesector);
	
	osg::ref_ptr<osg::Geode> geode = new osg::Geode;
	geode->addDrawable(new osg::ShapeDrawable(new osg::Box(osg::Vec3(0.0, 0.0, 0.0), 10.0, 8.0, 6.0)));
	group->addChild(geode);
	group->accept(*intersectionVisitor.get());

	osgUtil::LineSegmentIntersector::Intersections intersections;
	//輸出交點
	if (lineSegmentIntesector->containsIntersections())
	{
		intersections = lineSegmentIntesector->getIntersections();
		osgUtil::LineSegmentIntersector::Intersections::iterator iter;
		for (iter = intersections.begin(); iter != intersections.end(); ++iter)
		{
			std::cout << "x:" << iter->getWorldIntersectPoint().x() << "    y:" << iter->getWorldIntersectPoint().y() << "    z:" << iter->getWorldIntersectPoint().z() << std::endl;
		}
	}
	viewer->setSceneData(group.get());
	viewer->setUpViewInWindow(200, 200, 800, 600, 0);

	return viewer->run();
}