96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
#include <osgUtil/UpdateVisitor>
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#include <osgDB/ReadFile>
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#include <osg/ShapeDrawable>
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#include <osg/PositionAttitudeTransform>
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#include <osgGA/TrackballManipulator>
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#include <osgViewer/Viewer>
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#include "DepthPartitionNode.h"
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const double r_earth = 6378.137;
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const double r_sun = 695990.0;
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const double AU = 149697900.0;
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osg::Node* createScene()
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{
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// Create the Earth, in blue
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osg::ShapeDrawable *earth_sd = new osg::ShapeDrawable;
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osg::Sphere* earth_sphere = new osg::Sphere;
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earth_sphere->setRadius(r_earth);
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earth_sd->setShape(earth_sphere);
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earth_sd->setColor(osg::Vec4(0, 0, 1.0, 1.0));
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osg::Geode* earth = new osg::Geode;
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earth->setName("earth");
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earth->addDrawable(earth_sd);
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// Create the Sun, in yellow
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osg::ShapeDrawable *sun_sd = new osg::ShapeDrawable;
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osg::Sphere* sun_sphere = new osg::Sphere;
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sun_sphere->setRadius(r_sun);
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sun_sd->setShape(sun_sphere);
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sun_sd->setColor(osg::Vec4(1.0, 0.0, 0.0, 1.0));
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osg::Geode* sun_geode = new osg::Geode;
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sun_geode->setName("sun");
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sun_geode->addDrawable(sun_sd);
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// Move the sun behind the earth
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osg::PositionAttitudeTransform *pat = new osg::PositionAttitudeTransform;
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pat->setPosition(osg::Vec3d(0.0, AU, 0.0));
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osg::Group* scene = new osg::Group;
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scene->addChild(earth);
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scene->addChild(pat);
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pat->addChild(sun_geode);
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return scene;
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}
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int main( int argc, char **argv )
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{
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// use an ArgumentParser object to manage the program arguments.
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osg::ArgumentParser arguments(&argc,argv);
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// construct the viewer.
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osgViewer::Viewer viewer;
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bool needToSetHomePosition = false;
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// read the scene from the list of file specified commandline args.
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osg::ref_ptr<osg::Node> scene = osgDB::readNodeFiles(arguments);
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// if one hasn't been loaded create an earth and sun test model.
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if (!scene)
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{
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scene = createScene();
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needToSetHomePosition = true;
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}
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// Create a DepthPartitionNode to manage partitioning of the scene
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osg::ref_ptr<DepthPartitionNode> dpn = new DepthPartitionNode;
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dpn->addChild(scene.get());
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dpn->setActive(true); // Control whether the node analyzes the scene
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// pass the loaded scene graph to the viewer.
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viewer.setSceneData(dpn.get());
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viewer.setCameraManipulator(new osgGA::TrackballManipulator);
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if (needToSetHomePosition)
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{
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viewer.getCameraManipulator()->setHomePosition(osg::Vec3d(0.0,-5.0*r_earth,0.0),osg::Vec3d(0.0,0.0,0.0),osg::Vec3d(0.0,0.0,1.0));
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}
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// depth partion node is only supports single window/single threaded at present.
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viewer.setThreadingModel(osgViewer::Viewer::SingleThreaded);
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return viewer.run();
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}
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