Hi,
Shayne,
so I've been trying your solution for HAT and am having little luck.
I've worked through a few things to be sure that I'm getting the reasonable
numbers etc
but it seems that i always get the same height back as I put into the. \
I must be missing something... help would be appreciated!
terrain is pagedLOD and created with vpb using the --geocentric flag
pos = lat, lon, height_above_sealevel (maybe that should be above the center of
the earth?)
...
Code:
getHat(osg::Vec3f pos, osg::Node* target)
{
// turn off OSG_NOTICE which prints out from computeIntersection called from
computeHeightAboveTerrain
osg::setNotifyLevel(osg::WARN);
osgSim::HeightAboveTerrain myhat;
// print what I pass in.... something like lat 32.???, lon -111.???, height
= 545.???
printf("inlat, inlon, inhgt = %f %f %f \n",pos[0],pos[1],pos[2]);
// get the world XYZ coords
double X,Y,Z;
dynamic_cast<osg::CoordinateSystemNode*>(target)->getEllipsoidModel()->convertLatLongHeightToXYZ(
osg::DegreesToRadians(pos[0]),
osg::DegreesToRadians(pos[1]),
pos[2], X,Y,Z);
// the resulting XYZ looks like reasonable numbers... X & Y in the neg
millions, Z pos mill
printf("X,Y,Z = %f %f %f\n",X,Y,Z);
// just want to check that nothing messed up the numbers
double lat, lon, height;
em->convertXYZToLatLongHeight(X,Y,Z,lat,lon,height);
printf("lat lon height = %f %f
%f\n",osg::RadiansToDegrees(lat),osg::RadiansToDegrees(lon),height);
if( Scene* scene = dynamic_cast<Scene*>( m_viewer.getSceneData() ) )
{
osg::Node* terrain = scene->getEarthModel();
hat =
osgSim::HeightAboveTerrain::computeHeightAboveTerrain(terrain,osg::Vec3d(X,Y,Z));
printf(" HAT = %f pos = %f %f %f\n",hat, X, Y, Z);
}
}
here is the output
inlat,inlon,inhgt = 32.875961 -111.756973 545.467957
X,Y,Z = -1987688.866583 -4980417.869354 3442709.618813
lat lon height = 32.875961 -111.756983 545.467957
HAT = 545.467957 pos = -1987688.866583 -4980417.869354 3442709.618813
do I need to set something about the terrain lowest elevation?
Cheers,
lawrence
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=58755#58755
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