i have some trouble to calculate the altitude in my application
i have
- a pagedlod terrain
- a runway
- and an airplane model
i have taken some of the osgearth code in elevationmanager.cpp as a starting
point
this code is called every frame :
Code:
Transform tr;
mAirplane->GetTransform(tr);
tr.GetTranslation(x,y,z);
osg::Vec3d start, end, zero;
start.x() = x; start.y() = y; start.z() = 50000;
end.x() = x; end.y() = y; end.z() = -50000;
zero.x() = x; zero.y() = y; zero.z() = 0;
osgUtil::LineSegmentIntersector* i = new osgUtil::LineSegmentIntersector(
start, end );
osgUtil::IntersectionVisitor iv;
iv.setIntersector( i );
mTerrain->GetOSGNode()->accept( iv );
osgUtil::LineSegmentIntersector::Intersections& results = i->getIntersections();
if ( !results.empty() )
{
const osgUtil::LineSegmentIntersector::Intersection& result = *results.begin();
osg::Vec3d isectPoint = result.getWorldIntersectPoint();
double out_elevation = (isectPoint-end).length2() > (zero-end).length2()
? (isectPoint-zero).length()
: -(isectPoint-zero).length();
std::cout << distance <<std::endl;
ps : i am using delta3D
the problem is that the result out_elevation is always a static number
and it don't change when i move the airplane
what the simplest formula to calculate the altitude with the
LineSegmentIntersector ?
thanks and good day
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