FGFS-4.1/OpenSceneGraph
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Added basic PolytopeIntersector functionality based on checking vertices against

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polytopes.
This commit is contained in:
Robert Osfield
2006-11-02 15:50:04 +00:00
parent c3643a738c
commit 7d12b85632
2 changed files with 106 additions and 54 deletions
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147
examples/osgkeyboardmouse/osgkeyboardmouse.cpp
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@@ -183,70 +183,113 @@ public:
osg::Node* scene = viewer->getSceneData();
if (!scene) return;
osg::notify(osg::NOTICE)<<std::endl;
osg::notify(osg::NOTICE)<<std::endl;
osg::Node* node = 0;
osg::Group* parent = 0;
#if 0
// use non dimension coordinates - in projection/clip space
osgUtil::LineSegmentIntersector* picker = new osgUtil::LineSegmentIntersector(osgUtil::Intersector::PROJECTION, osg::Vec3d(ea.getXnormalized(),ea.getYnormalized(),-1.0), osg::Vec3d(ea.getXnormalized(),ea.getYnormalized(),1.0) );
#else
// use window coordinates
// remap the mouse x,y into viewport coordinates.
osg::Viewport* viewport = viewer->getCamera()->getViewport();
float mx = viewport->x() + (int)((float)viewport->width()*(ea.getXnormalized()*0.5f+0.5f));
float my = viewport->y() + (int)((float)viewport->height()*(ea.getYnormalized()*0.5f+0.5f));
osgUtil::LineSegmentIntersector* picker = new osgUtil::LineSegmentIntersector(osgUtil::Intersector::WINDOW, osg::Vec3d(mx,my,0.0), osg::Vec3d(mx,my,1.0) );
#endif
osgUtil::IntersectionVisitor iv(picker);
viewer->getCamera()->accept(iv);
if (picker->containsIntersections())
bool usePolytopePicking = true;
if (usePolytopePicking)
{
osgUtil::LineSegmentIntersector::Intersection intersection = picker->getFirstIntersection();
osg::notify(osg::NOTICE)<<"Picked "<<intersection.localIntersectionPoint<<std::endl;
// use window coordinates
// remap the mouse x,y into viewport coordinates.
osg::Viewport* viewport = viewer->getCamera()->getViewport();
float mx = viewport->x() + (int)((float)viewport->width()*(ea.getXnormalized()*0.5f+0.5f));
float my = viewport->y() + (int)((float)viewport->height()*(ea.getYnormalized()*0.5f+0.5f));
#if 1
osg::NodePath& nodePath = intersection.nodePath;
osg::Node* node = (nodePath.size()>=1)?nodePath[nodePath.size()-1]:0;
osg::Group* parent = (nodePath.size()>=2)?dynamic_cast<osg::Group*>(nodePath[nodePath.size()-2]):0;
float width = 10.0f;
float height = 10.0f;
if (node) std::cout<<" Hits "<<node->className()<<" nodePath size"<<nodePath.size()<<std::endl;
float min_x = mx - width*0.5;
float max_x = mx + width*0.5;
float min_y = my - height*0.5;
float max_y = my + height*0.5;
// now we try to decorate the hit node by the osgFX::Scribe to show that its been "picked"
if (parent && node)
osg::Polytope polytope;
polytope.add(osg::Plane(1,0,0,-min_x));
polytope.add(osg::Plane(-1,0,0,max_x));
polytope.add(osg::Plane(0,1,0,-min_y));
polytope.add(osg::Plane(0,-1,0,max_y));
polytope.add(osg::Plane(0,0,1,0));
osgUtil::PolytopeIntersector* picker = new osgUtil::PolytopeIntersector( osgUtil::Intersector::WINDOW, polytope );
osgUtil::IntersectionVisitor iv(picker);
viewer->getCamera()->accept(iv);
if (picker->containsIntersections())
{
osgUtil::PolytopeIntersector::Intersection intersection = picker->getFirstIntersection();
std::cout<<" parent "<<parent->className()<<std::endl;
osg::NodePath& nodePath = intersection.nodePath;
node = (nodePath.size()>=1)?nodePath[nodePath.size()-1]:0;
parent = (nodePath.size()>=2)?dynamic_cast<osg::Group*>(nodePath[nodePath.size()-2]):0;
if (node) std::cout<<" Hits "<<node->className()<<" nodePath size"<<nodePath.size()<<std::endl;
osgFX::Scribe* parentAsScribe = dynamic_cast<osgFX::Scribe*>(parent);
if (!parentAsScribe)
{
// node not already picked, so highlight it with an osgFX::Scribe
osgFX::Scribe* scribe = new osgFX::Scribe();
scribe->addChild(node);
parent->replaceChild(node,scribe);
}
else
{
// node already picked so we want to remove scribe to unpick it.
osg::Node::ParentList parentList = parentAsScribe->getParents();
for(osg::Node::ParentList::iterator itr=parentList.begin();
itr!=parentList.end();
++itr)
{
(*itr)->replaceChild(parentAsScribe,node);
}
}
}
#endif
}
else
{
#if 0
// use non dimension coordinates - in projection/clip space
osgUtil::LineSegmentIntersector* picker = new osgUtil::LineSegmentIntersector(osgUtil::Intersector::PROJECTION, osg::Vec3d(ea.getXnormalized(),ea.getYnormalized(),-1.0), osg::Vec3d(ea.getXnormalized(),ea.getYnormalized(),1.0) );
#else
// use window coordinates
// remap the mouse x,y into viewport coordinates.
osg::Viewport* viewport = viewer->getCamera()->getViewport();
float mx = viewport->x() + (int)((float)viewport->width()*(ea.getXnormalized()*0.5f+0.5f));
float my = viewport->y() + (int)((float)viewport->height()*(ea.getYnormalized()*0.5f+0.5f));
osgUtil::LineSegmentIntersector* picker = new osgUtil::LineSegmentIntersector(osgUtil::Intersector::WINDOW, osg::Vec3d(mx,my,0.0), osg::Vec3d(mx,my,1.0) );
#endif
osgUtil::IntersectionVisitor iv(picker);
viewer->getCamera()->accept(iv);
if (picker->containsIntersections())
{
osgUtil::LineSegmentIntersector::Intersection intersection = picker->getFirstIntersection();
osg::notify(osg::NOTICE)<<"Picked "<<intersection.localIntersectionPoint<<std::endl;
osg::NodePath& nodePath = intersection.nodePath;
node = (nodePath.size()>=1)?nodePath[nodePath.size()-1]:0;
parent = (nodePath.size()>=2)?dynamic_cast<osg::Group*>(nodePath[nodePath.size()-2]):0;
if (node) std::cout<<" Hits "<<node->className()<<" nodePath size"<<nodePath.size()<<std::endl;
}
}
// now we try to decorate the hit node by the osgFX::Scribe to show that its been "picked"
if (parent && node)
{
std::cout<<" parent "<<parent->className()<<std::endl;
osgFX::Scribe* parentAsScribe = dynamic_cast<osgFX::Scribe*>(parent);
if (!parentAsScribe)
{
// node not already picked, so highlight it with an osgFX::Scribe
osgFX::Scribe* scribe = new osgFX::Scribe();
scribe->addChild(node);
parent->replaceChild(node,scribe);
}
else
{
// node already picked so we want to remove scribe to unpick it.
osg::Node::ParentList parentList = parentAsScribe->getParents();
for(osg::Node::ParentList::iterator itr=parentList.begin();
itr!=parentList.end();
++itr)
{
(*itr)->replaceChild(parentAsScribe,node);
}
}
}
}
void saveSelectedModel(osg::Node* scene)

13
src/osgUtil/IntersectionVisitor.cpp
View File

@@ -564,9 +564,18 @@ void PolytopeIntersector::intersect(osgUtil::IntersectionVisitor& iv, osg::Drawa
{
if ( !_polytope.contains( drawable->getBound() ) ) return;
osg::Geometry* geometry = drawable->asGeometry();
osg::Vec3Array* vertices = geometry ? dynamic_cast<osg::Vec3Array*>(geometry->getVertexArray()) : 0;
if (vertices)
{
if (!_polytope.contains(*vertices)) return;
}
Intersection hit;
hit.nodePath = iv.getNodePath();
hit.drawable = drawable;
insertIntersection(hit);
}
@@ -736,11 +745,11 @@ void IntersectionVisitor::reset()
void IntersectionVisitor::apply(osg::Node& node)
{
osg::notify(osg::NOTICE)<<"apply(Node&)"<<std::endl;
// osg::notify(osg::NOTICE)<<"apply(Node&)"<<std::endl;
if (!enter(node)) return;
osg::notify(osg::NOTICE)<<"inside apply(Node&)"<<std::endl;
// osg::notify(osg::NOTICE)<<"inside apply(Node&)"<<std::endl;
traverse(node);