OpenSceneGraph/examples/osgdepthpartition/osgdepthpartition.cpp

114 lines
3.6 KiB
C++

/* OpenSceneGraph example, osgdepthpartion.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <osgUtil/UpdateVisitor>
#include <osgDB/ReadFile>
#include <osg/ShapeDrawable>
#include <osg/PositionAttitudeTransform>
#include <osgGA/TrackballManipulator>
#include <osgViewer/Viewer>
#include "DepthPartitionNode.h"
const double r_earth = 6378.137;
const double r_sun = 695990.0;
const double AU = 149697900.0;
osg::Node* createScene()
{
// Create the Earth, in blue
osg::ShapeDrawable *earth_sd = new osg::ShapeDrawable;
osg::Sphere* earth_sphere = new osg::Sphere;
earth_sphere->setRadius(r_earth);
earth_sd->setShape(earth_sphere);
earth_sd->setColor(osg::Vec4(0, 0, 1.0, 1.0));
osg::Geode* earth = new osg::Geode;
earth->setName("earth");
earth->addDrawable(earth_sd);
// Create the Sun, in yellow
osg::ShapeDrawable *sun_sd = new osg::ShapeDrawable;
osg::Sphere* sun_sphere = new osg::Sphere;
sun_sphere->setRadius(r_sun);
sun_sd->setShape(sun_sphere);
sun_sd->setColor(osg::Vec4(1.0, 0.0, 0.0, 1.0));
osg::Geode* sun_geode = new osg::Geode;
sun_geode->setName("sun");
sun_geode->addDrawable(sun_sd);
// Move the sun behind the earth
osg::PositionAttitudeTransform *pat = new osg::PositionAttitudeTransform;
pat->setPosition(osg::Vec3d(0.0, AU, 0.0));
osg::Group* scene = new osg::Group;
scene->addChild(earth);
scene->addChild(pat);
pat->addChild(sun_geode);
return scene;
}
int main( int argc, char **argv )
{
// use an ArgumentParser object to manage the program arguments.
osg::ArgumentParser arguments(&argc,argv);
// construct the viewer.
osgViewer::Viewer viewer;
bool needToSetHomePosition = false;
// read the scene from the list of file specified commandline args.
osg::ref_ptr<osg::Node> scene = osgDB::readNodeFiles(arguments);
// if one hasn't been loaded create an earth and sun test model.
if (!scene)
{
scene = createScene();
needToSetHomePosition = true;
}
// Create a DepthPartitionNode to manage partitioning of the scene
osg::ref_ptr<DepthPartitionNode> dpn = new DepthPartitionNode;
dpn->addChild(scene.get());
dpn->setActive(true); // Control whether the node analyzes the scene
// pass the loaded scene graph to the viewer.
viewer.setSceneData(dpn.get());
viewer.setCameraManipulator(new osgGA::TrackballManipulator);
if (needToSetHomePosition)
{
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));
}
// depth partion node is only supports single window/single threaded at present.
viewer.setThreadingModel(osgViewer::Viewer::SingleThreaded);
return viewer.run();
}