Hello Gianni, 2) line geometry is infinitely thin. To create an exact intersection with another line in floating point precision is like winning the lottery. You will want to use PolytopeIntersector to intersect with non-polygonal geometry instead.
2014-11-03 10:37 GMT+01:00 Gianni Ambrosio <[email protected]>: > Hi All, > I'm trying to handle mouse movements to show some informations to the user. > I have basically two questions. > > 1) Lookig at "osgkeyboardmouse.cpp" example found the following code: > > Code: > > if (_useWindowCoordinates) > { > // use window coordinates > // remap the mouse x,y into viewport coordinates. > osg::Viewport* viewport = > viewer->getCamera()->getViewport(); > double mx = viewport->x() + (int)((double > )viewport->width()*(ea.getXnormalized()*0.5+0.5)); > double my = viewport->y() + (int)((double > )viewport->height()*(ea.getYnormalized()*0.5+0.5)); > > // half width, height. > double w = 5.0f; > double h = 5.0f; > picker = new osgUtil::PolytopeIntersector( > osgUtil::Intersector::WINDOW, mx-w, my-h, mx+w, my+h ); > } else { > double mx = ea.getXnormalized(); > double my = ea.getYnormalized(); > double w = 0.05; > double h = 0.05; > picker = new osgUtil::PolytopeIntersector( > osgUtil::Intersector::PROJECTION, mx-w, my-h, mx+w, my+h ); > } > > > > Is there a casa in which osgUtil::Intersector::WINDOW option is preferred > with respect to osgUtil::Intersector::PROJECTION? > > 2) osgUtil::LineSegmentIntersector does not seem to work fine if the > geometry is a line created with: > > osg::Vec3Array* vertices = new osg::Vec3Array; > ... > osg::DrawElementsUInt* elements = new > osg::DrawElementsUInt(osg::PrimitiveSet::LINE_STRIP); > geometry->setVertexArray(vertices); > geometry->addPrimitiveSet(elements); > > In this case when I move the mouse over that geometry I get > containsIntersections() = false. > Could you please explain me why? > > Regards, > Gianni > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=61492#61492 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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