Hi,
I've got a problem with line segment intersector. Sometimes I get only one
intersection (on the bootom side of the "table"), while I should get two.
Please check the screenshot.
Do you have any idea why this happens? What should I do?
STLFILE.stl (ZIPPED) is attached
Thank you!
Cheers,
Peter
Hold CTRL key to activate intersection output.
This is the code I use:
Code:
#include "stdafx.h"
#include <osgViewer/Viewer>
#include <osgDB/ReadFile>
#include <osgUtil/LineSegmentIntersector>
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 ||
!(ea.getModKeyMask()&osgGA::GUIEventAdapter::MODKEY_CTRL) )
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() );
iv.setTraversalMask( ~0x1 );
viewer->getCamera()->accept( iv );
if ( intersector->containsIntersections() ){
const
osgUtil::LineSegmentIntersector::Intersection& result =
*(intersector->getIntersections().begin());
printf("Intersection count:%d. Coordinates: %.2f, %.2f,
%.2f\n",
intersector->getIntersections().size(),
result.getWorldIntersectPoint().x(),result.getWorldIntersectPoint().y(),result.getWorldIntersectPoint().z());
}
}
return false;
}
};
int main( int argc, char** argv )
{
osg::ref_ptr<osg::Node> model1 = osgDB::readNodeFile( "STLFILE.stl" );
osg::ref_ptr<osg::Group> root = new osg::Group;
root->addChild( model1.get() );
osg::ref_ptr<PickHandler> picker = new PickHandler;
osgViewer::Viewer viewer;
viewer.setSceneData( root.get() );
viewer.addEventHandler( picker.get() );
return viewer.run();
}
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=50644#50644
Attachments:
http://forum.openscenegraph.org//files/intersection_errors_639.png
http://forum.openscenegraph.org//files/stlfile_974.zip
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