Hi all,
I think I've got a problem while testing the new osgdepthpartition
example. I added a PickHandler to test if the IntersectionVisitor
could work under such huge environment. It failed to intersect with
anything unless I moved very near to the earth geode. The command I
used is:
# osgdepthpartition --depth-partition 1 20000 200000000
With the attached example code, when the intersector works, you should
see a line on the terminal when pressing left button on the earth. But
at most time there are no outputs. I guess if the problem is related
to the camera projection matrix. As far as I know, the calculated
projection matrix will be applied to the main camera in the
CullVisitor. Maybe we could dig and make some changes to make the
mechanism work with depth-partition?
A quick test of previous osgdepthpartition example (with the
DepthPartition node) seemed to fail with intersections, too.
Cheers,
Wang Rui
#include <osg/io_utils>
#include <osg/ShapeDrawable>
#include <osg/PositionAttitudeTransform>
#include <osg/Texture2D>
#include <osgDB/FileUtils>
#include <osgDB/ReadFile>
#include <osgGA/TrackballManipulator>
#include <osgGA/StateSetManipulator>
#include <osgUtil/LineSegmentIntersector>
#include <osgViewer/ViewerEventHandlers>
#include <osgViewer/Viewer>
#include <iostream>
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->setName("EarthSphere");
earth_sphere->setRadius(r_earth);
earth_sd->setShape(earth_sphere);
earth_sd->setColor(osg::Vec4(0, 0, 1.0, 1.0));
osg::Geode* earth_geode = new osg::Geode;
earth_geode->setName("EarthGeode");
earth_geode->addDrawable(earth_sd);
// Create the Sun, in yellow
osg::ShapeDrawable *sun_sd = new osg::ShapeDrawable;
osg::Sphere* sun_sphere = new osg::Sphere;
sun_sphere->setName("SunSphere");
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("SunGeode");
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));
pat->addChild(sun_geode);
osg::Geometry * unitCircle = new osg::Geometry();
{
osg::Vec4Array * colours = new osg::Vec4Array(1);
(*colours)[0] = osg::Vec4d(1.0,1.0,1.0,1.0);
unitCircle->setColorArray(colours);
unitCircle->setColorBinding(osg::Geometry::BIND_OVERALL);
const unsigned int n_points = 1024;
osg::Vec3Array * coords = new osg::Vec3Array(n_points);
const double dx = 2.0*osg::PI/n_points;
double s,c;
for (unsigned int j=0; j<n_points; ++j) {
s = sin(dx*j);
c = cos(dx*j);
(*coords)[j].set(osg::Vec3d(c,s,0.0));
}
unitCircle->setVertexArray(coords);
unitCircle->getOrCreateStateSet()->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
unitCircle->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINE_LOOP,0,n_points));
}
osg::Geometry *axes = new osg::Geometry;
{
osg::Vec4Array *colours = new osg::Vec4Array(1);
(*colours)[0] = osg::Vec4d(1.0,0.0,0.0,1.0);
axes->setColorArray(colours);
axes->setColorBinding(osg::Geometry::BIND_OVERALL);
osg::Vec3Array *coords = new osg::Vec3Array(6);
(*coords)[0].set(osg::Vec3d(0.0, 0.0, 0.0));
(*coords)[1].set(osg::Vec3d(0.5, 0.0, 0.0));
(*coords)[2].set(osg::Vec3d(0.0, 0.0, 0.0));
(*coords)[3].set(osg::Vec3d(0.0, 0.5, 0.0));
(*coords)[4].set(osg::Vec3d(0.0, 0.0, 0.0));
(*coords)[5].set(osg::Vec3d(0.0, 0.0, 0.5));
axes->setVertexArray(coords);
axes->getOrCreateStateSet()->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
axes->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINES,0,6));
}
// Earth orbit
osg::Geode * earthOrbitGeode = new osg::Geode;
earthOrbitGeode->addDrawable(unitCircle);
earthOrbitGeode->addDrawable(axes);
earthOrbitGeode->setName("EarthOrbitGeode");
osg::PositionAttitudeTransform * earthOrbitPAT = new osg::PositionAttitudeTransform;
earthOrbitPAT->setScale(osg::Vec3d(AU,AU,AU));
earthOrbitPAT->setPosition(osg::Vec3d(0.0, AU, 0.0));
earthOrbitPAT->addChild(earthOrbitGeode);
earthOrbitPAT->setName("EarthOrbitPAT");
osg::Group* scene = new osg::Group;
scene->setName("SceneGroup");
scene->addChild(earth_geode);
scene->addChild(pat);
scene->addChild(earthOrbitPAT);
return scene;
}
class PickHandler : public osgGA::GUIEventHandler
{
public:
virtual bool handle( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa )
{
if ( ea.getEventType()!=osgGA::GUIEventAdapter::RELEASE ||
ea.getButton()!=osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON )
return false;
osgViewer::Viewer* viewer = dynamic_cast<osgViewer::Viewer*>(&aa);
if ( viewer )
{
osg::ref_ptr<osgUtil::LineSegmentIntersector> intersector =
new osgUtil::LineSegmentIntersector(osgUtil::Intersector::WINDOW, ea.getX(), ea.getY());
osgUtil::IntersectionVisitor iv( intersector.get() );
viewer->getCamera()->accept( iv );
if ( intersector->containsIntersections() )
{
osgUtil::LineSegmentIntersector::Intersection& result =
*(intersector->getIntersections().begin());
std::cout << "We picked " << result.nodePath.back()->getName() << std::endl;
}
}
return false;
}
};
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;
// add the state manipulator
viewer.addEventHandler( new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()) );
// add stats
viewer.addEventHandler( new osgViewer::StatsHandler() );
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;
}
// pass the loaded scene graph to the viewer.
viewer.setSceneData(scene.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));
}
double zNear=1.0, zMid=10.0, zFar=1000.0;
if (arguments.read("--depth-partition",zNear, zMid, zFar))
{
// set up depth partitioning
osg::ref_ptr<osgViewer::DepthPartitionSettings> dps = new osgViewer::DepthPartitionSettings;
dps->_mode = osgViewer::DepthPartitionSettings::FIXED_RANGE;
dps->_zNear = zNear;
dps->_zMid = zMid;
dps->_zFar = zFar;
viewer.setUpDepthPartition(dps.get());
}
else
{
// set up depth partitioning with default settings
viewer.setUpDepthPartition();
}
viewer.addEventHandler(new PickHandler);
return viewer.run();
}
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