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scene: Allow ground based elevations in stg files.

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PLEASE do not use this feature for many objects over
fine tesselated ground. But for convenience make this work.
This commit is contained in:
Mathias Froehlich 2012-08-26 14:58:39 +02:00
parent 287ed83de7
commit 54ff2bec90
1 changed files with 41 additions and 5 deletions
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46
simgear/scene/tgdb/ReaderWriterSTG.cxx
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@ -27,6 +27,8 @@
#include <osg/MatrixTransform>
#include <osg/ProxyNode>
#include <osgUtil/LineSegmentIntersector>
#include <osgUtil/IntersectionVisitor>
#include <osgDB/FileNameUtils>
#include <osgDB/FileUtils>
@ -85,20 +87,22 @@ struct ReaderWriterSTG::_ModelBin {
osg::ref_ptr<SGReaderWriterOptions> _options;
};
struct _ObjectStatic {
_ObjectStatic() : _proxy(false), _lon(0), _lat(0), _elev(0), _hdg(0), _pitch(0), _roll(0) { }
_ObjectStatic() : _agl(false), _proxy(false), _lon(0), _lat(0), _elev(0), _hdg(0), _pitch(0), _roll(0) { }
std::string _errorLocation;
std::string _token;
std::string _name;
bool _agl;
bool _proxy;
double _lon, _lat, _elev;
double _hdg, _pitch, _roll;
osg::ref_ptr<SGReaderWriterOptions> _options;
};
struct _Sign {
_Sign() : _lon(0), _lat(0), _elev(0), _hdg(0), _size(-1) { }
_Sign() : _agl(false), _lon(0), _lat(0), _elev(0), _hdg(0), _size(-1) { }
std::string _errorLocation;
std::string _token;
std::string _name;
bool _agl;
double _lon, _lat, _elev;
double _hdg;
int _size;
@ -134,6 +138,23 @@ struct ReaderWriterSTG::_ModelBin {
return staticOptions.release();
}
double elevation(osg::Group& group, const SGGeod& geod)
{
SGVec3d start = SGVec3d::fromGeod(SGGeod::fromGeodM(geod, 10000));
SGVec3d end = SGVec3d::fromGeod(SGGeod::fromGeodM(geod, -1000));
osg::ref_ptr<osgUtil::LineSegmentIntersector> intersector;
intersector = new osgUtil::LineSegmentIntersector(toOsg(start), toOsg(end));
osgUtil::IntersectionVisitor visitor(intersector.get());
group.accept(visitor);
if (!intersector->containsIntersections())
return 0;
SGVec3d cart = toSG(intersector->getFirstIntersection().getWorldIntersectPoint());
return SGGeod::fromCart(cart).getElevationM();
}
bool read(const std::string& absoluteFileName, const osgDB::Options* options)
{
if (absoluteFileName.empty())
@ -204,7 +225,7 @@ struct ReaderWriterSTG::_ModelBin {
} else {
// Always OK to load
if (token == "OBJECT_STATIC") {
if (token == "OBJECT_STATIC" || token == "OBJECT_STATIC_AGL") {
if (!onlyTerrain) {
osg::ref_ptr<SGReaderWriterOptions> opt;
opt = staticOptions(filePath, options);
@ -216,13 +237,14 @@ struct ReaderWriterSTG::_ModelBin {
obj._errorLocation = absoluteFileName;
obj._token = token;
obj._name = name;
obj._agl = (token == "OBJECT_STATIC_AGL");
obj._proxy = true;
in >> obj._lon >> obj._lat >> obj._elev >> obj._hdg >> obj._pitch >> obj._roll;
obj._options = opt;
_objectStaticList.push_back(obj);
}
} else if (token == "OBJECT_SHARED") {
} else if (token == "OBJECT_SHARED" || token == "OBJECT_SHARED_AGL") {
if (!onlyTerrain) {
osg::ref_ptr<SGReaderWriterOptions> opt;
opt = staticOptions(filePath, options);
@ -234,17 +256,19 @@ struct ReaderWriterSTG::_ModelBin {
obj._errorLocation = absoluteFileName;
obj._token = token;
obj._name = name;
obj._agl = (token == "OBJECT_SHARED_AGL");
obj._proxy = false;
in >> obj._lon >> obj._lat >> obj._elev >> obj._hdg >> obj._pitch >> obj._roll;
obj._options = opt;
_objectStaticList.push_back(obj);
}
} else if (token == "OBJECT_SIGN") {
} else if (token == "OBJECT_SIGN" || token == "OBJECT_SIGN_AGL") {
if (!onlyTerrain) {
_Sign sign;
sign._token = token;
sign._name = name;
sign._agl = (token == "OBJECT_SIGN_AGL");
in >> sign._lon >> sign._lat >> sign._elev >> sign._hdg >> sign._size;
_signList.push_back(sign);
}
@ -290,6 +314,18 @@ struct ReaderWriterSTG::_ModelBin {
}
}
for (std::list<_ObjectStatic>::iterator i = _objectStaticList.begin(); i != _objectStaticList.end(); ++i) {
if (!i->_agl)
continue;
i->_elev += elevation(*group, SGGeod::fromDeg(i->_lon, i->_lat));
}
for (std::list<_Sign>::iterator i = _signList.begin(); i != _signList.end(); ++i) {
if (!i->_agl)
continue;
i->_elev += elevation(*group, SGGeod::fromDeg(i->_lon, i->_lat));
}
for (std::list<_ObjectStatic>::iterator i = _objectStaticList.begin(); i != _objectStaticList.end(); ++i) {
osg::ref_ptr<osg::Node> node;
if (i->_proxy) {