Hi,
I am trying to get the intersection points between an intersection plane and a
terrain using osgUtil::PlaneIntersector。
The code is listed as following:
osg::Plane planeLeft( osg::Vec3(1,0,0), osg::Vec3(0+1,0,0) );//define
an intersetion plane
osg::Polytope polytopeLeft;//define the range of planeLeft
polytopeLeft.add( osg::Plane(osg::Vec3(0,1,0), osg::Vec3(0,0,0)) );
polytopeLeft.add( osg::Plane(osg::Vec3(0,-1,0),
osg::Vec3(0,GlobalVariable::g_maxDepth,0)) );
osg::ref_ptr<osgUtil::PlaneIntersector> insectorLeft = new
osgUtil::PlaneIntersector(planeLeft, polytopeLeft);
osgUtil::IntersectionVisitor ivleft(insectorLeft);
geodeTerrain->accept(ivleft);
if (insectorLeft->containsIntersections() )
{
//output the intersection points
fstream file;
file.open("Terrain.txt",ios::out);
osgUtil::PlaneIntersector::Intersections& intersections =
insectorLeft->getIntersections();
osgUtil::PlaneIntersector::Intersections::iterator itr =
intersections.begin();
for ( unsigned int i=0; i<(*itr).polyline.size(); ++i )
{
file<<(*itr).polyline[i].x()<<","<<(*itr).polyline[i].y()<<","<<(*itr).polyline[i].z()<<std::endl;
}
file.close();
}
I can get the intersection points successfully. But, when I change the terrain
value just multiplying it with 3 and intersect with the same plane again, the
sequence of output intersection points is reversed. So I wonder how can I
control the sequence of the intersection points.
Thank you!
Cheers,
Tianyun
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=56669#56669
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