FGFS-4.1/OpenSceneGraph
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Added support for gather information on which vertices have been intersected with.

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This commit is contained in:
Robert Osfield 2003-04-25 13:47:33 +00:00
parent 84fb15717d
commit 89b1365b2b
3 changed files with 76 additions and 22 deletions
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40
examples/osgpick/osgpick.cpp
View File

@ -28,6 +28,7 @@
#include <osgText/Text>
#include <sstream>
// class to handle events with a pick
class PickHandler : public osgGA::GUIEventHandler {
@ -80,21 +81,26 @@ void PickHandler::pick(const osgGA::GUIEventAdapter& ea)
hitr!=hlist.end();
++hitr)
{
//osg::Vec3 ip = hitr->getLocalIntersectPoint();
//osg::Vec3 in = hitr->getLocalIntersectNormal();
osg::Geode* geode = hitr->_geode.get();
// the geodes are identified by name.
if (geode)
std::ostringstream os;
if (hitr->_geode.valid() && !hitr->_geode->getName().empty())
{
if (!geode->getName().empty())
{
gdlist=gdlist+" "+geode->getName();
}
else
{
gdlist=gdlist+" geode";
}
}
// the geodes are identified by name.
os<<"Object \""<<hitr->_geode->getName()<<"\""<<std::endl;
}
else if (hitr->_drawable.valid())
{
os<<"Object \""<<hitr->_drawable->className()<<"\""<<std::endl;
}
os<<" local coords vertex("<< hitr->getLocalIntersectPoint()<<")"<<" normal("<<hitr->getLocalIntersectNormal()<<")"<<std::endl;
os<<" world coords vertex("<< hitr->getWorldIntersectPoint()<<")"<<" normal("<<hitr->getWorldIntersectNormal()<<")"<<std::endl;
osgUtil::Hit::VecIndexList& vil = hitr->_vecIndexList;
for(unsigned int i=0;i<vil.size();++i)
{
os<<" vertex indices ["<<i<<"] = "<<vil[i]<<std::endl;
}
gdlist += os.str();
}
}
setLabel(gdlist);
@ -177,12 +183,14 @@ osg::Node* createHUD(osgText::Text* updateText)
osg::StateSet* stateset = geode->getOrCreateStateSet();
stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
geode->setName("whatis");
geode->setName("The text label");
geode->addDrawable( updateText );
modelview_abs->addChild(geode);
updateText->setCharacterSize(20.0f);
updateText->setFont(timesFont);
updateText->setText("whatis will tell you what is under the mouse");
updateText->setColor(osg::Vec4(1.0f,1.0f,0.0f,1.0f));
updateText->setText("");
updateText->setPosition(position);
position += delta;

4
src/osgProducer/Viewer.cpp
View File

@ -39,8 +39,8 @@ public:
_lineSegment = new osg::LineSegment;
_lineSegment->set(nr,fr); // make a line segment
std::cout<<"near "<<nr<<std::endl;
std::cout<<"far "<<fr<<std::endl;
//std::cout<<"near "<<nr<<std::endl;
//std::cout<<"far "<<fr<<std::endl;
addLineSegment(_lineSegment.get());

54
src/osgUtil/IntersectVisitor.cpp
View File

@ -17,6 +17,7 @@
#include <osg/Billboard>
#include <osg/Notify>
#include <osg/TriangleFunctor>
#include <osg/Geometry>
#include <float.h>
#include <algorithm>
@ -304,6 +305,29 @@ void IntersectVisitor::apply(Node& node)
}
struct TriangleHit
{
TriangleHit(unsigned int index, const osg::Vec3& normal, float r1, const osg::Vec3* v1, float r2, const osg::Vec3* v2, float r3, const osg::Vec3* v3):
_index(index),
_normal(normal),
_r1(r1),
_v1(v1),
_r2(r2),
_v2(v2),
_r3(r3),
_v3(v3) {}
unsigned int _index;
const osg::Vec3 _normal;
float _r1;
const osg::Vec3* _v1;
float _r2;
const osg::Vec3* _v2;
float _r3;
const osg::Vec3* _v3;
};
struct TriangleIntersect
{
osg::ref_ptr<LineSegment> _seg;
@ -315,8 +339,11 @@ struct TriangleIntersect
int _index;
float _ratio;
bool _hit;
typedef std::multimap<float,std::pair<int,osg::Vec3> > TriangleHitList;
typedef std::multimap<float,TriangleHit> TriangleHitList;
TriangleHitList _thl;
TriangleIntersect()
@ -439,7 +466,7 @@ struct TriangleIntersect
return;
}
_thl.insert(std::pair<const float,std::pair<int,osg::Vec3> > (r,std::pair<int,osg::Vec3>(_index-1,normal)));
_thl.insert(std::pair<const float,TriangleHit>(r,TriangleHit(_index-1,normal,r1,&v1,r2,&v2,r3,&v3)));
_hit = true;
}
@ -466,11 +493,15 @@ bool IntersectVisitor::intersect(Drawable& drawable)
drawable.accept(ti);
if (ti._hit)
{
osg::Geometry* geometry = drawable.asGeometry();
for(TriangleIntersect::TriangleHitList::iterator thitr=ti._thl.begin();
thitr!=ti._thl.end();
++thitr)
{
Hit hit;
hit._nodePath = _nodePath;
hit._matrix = cis->_matrix;
@ -479,15 +510,30 @@ bool IntersectVisitor::intersect(Drawable& drawable)
if (_nodePath.empty()) hit._geode = NULL;
else hit._geode = dynamic_cast<Geode*>(_nodePath.back());
TriangleHit& triHit = thitr->second;
hit._ratio = thitr->first;
hit._primitiveIndex = thitr->second.first;
hit._primitiveIndex = triHit._index;
hit._originalLineSegment = sitr->first;
hit._localLineSegment = sitr->second;
hit._intersectPoint = sitr->second->start()*(1.0f-hit._ratio)+
sitr->second->end()*hit._ratio;
hit._intersectNormal = thitr->second.second;
hit._intersectNormal = triHit._normal;
if (geometry)
{
osg::Vec3Array* vertices = geometry->getVertexArray();
if (vertices)
{
osg::Vec3* first = &(vertices->front());
if (triHit._v1) hit._vecIndexList.push_back(triHit._v1-first);
if (triHit._v2) hit._vecIndexList.push_back(triHit._v2-first);
if (triHit._v2) hit._vecIndexList.push_back(triHit._v3-first);
}
}
_segHitList[sitr->first.get()].push_back(hit);