Re: [osg-users] Trouble Understanding osgPick (pick example QSG)
Hi Tom,
My scene graph structure is:
Root--Terrain
Root--group1--model1
--autotransform1
--shapefileNode1
Root--group2--model2
--autotransform2
--shapefileNode2
I am trying to pick for model1 and model2 in my graph.
So I have modified the pick function as follows: (I changed the polytope to
have width = 2.0 and height = 100.0)
The thing that puzzles me is when I pick the screen from far out (not zooming
in), and output all the nodes in nodePath, the model1 and model2 are not even
displayed when I cout the names.
I don't know what I am doing wrong here so thought I would post the pick() code
as well my scene graph structure.
Thanks in advance.
Sincerely,
Sanat.
Code:
//perform the pick operation
bool pick(const double x, double y, osgViewer::Viewer* viewer)
{
//colors the drawable in yellow
ColorVisitor highlighter;
highlighter.setColor(1.0, 1.0, 0.0, 1.0);
//colors the drawable in red i.e. the normal un-picked color
ColorVisitor redVisitor;
highlighter.setColor(1.0, 0.0, 0.0, 1.0);
if(!viewer-getSceneData())
//nothing to pick
{
return false;
}
double w(2.0);
double h(100.0);
osgUtil::PolytopeIntersector* picker =
new
osgUtil::PolytopeIntersector(osgUtil::Intersector::PROJECTION, x-w, y-h, x+w,
y+h);
osgUtil::IntersectionVisitor iv(picker);
viewer-getCamera()-accept(iv);
//pipe1Model-accept(iv);
if(picker-containsIntersections())
{
const osg::NodePath nodePath = picker-getFirstIntersection().nodePath;
unsigned int idx = nodePath.size();
std::cout -\n;
std::cout size of nodePath is = idx std::endl;
while(idx--)
{
std::cout node name: nodePath.at(idx)-getName()
std::endl;
//Find the group in the node path
//This will be the group to attach our visitor to
osg::Node* modelNode = dynamic_castosg::Node*(nodePath.at(idx));
if(modelNode == NULL)
{
continue;
}
//if not NULL then a matrix transform was found in the nodePath
if(_selectedNode != NULL)
{
if(_selectedNode-getName() == Model1 ||
_selectedNode-getName() == Model2)
{
//clear the previous selected node's callback to make it stop
spinning
//_selectedNode-setUpdateCallback(NULL);
std::cout _selectedNode-getName() std::endl;
_selectedNode-accept(redVisitor);
}
}
_selectedNode = modelNode;
if(_selectedNode-getName() == Model1 ||
_selectedNode-getName() == Model2)
{
std::cout _selectedNode-getName() std::endl;
_selectedNode-accept(highlighter);
}
break;
}//while(...)
if(!_selectedNode.valid())
{
osg::notify() Pick failed. std::endl;
}
}
else if(_selectedNode.valid())
{
//_selectedNode-setUpdateCallback(NULL);
if(_selectedNode-getName() == Model1 ||
_selectedNode-getName() == Model2)
{
std::cout _selectedNode-getName() std::endl;
_selectedNode-accept(highlighter);
_selectedNode = NULL;
}
}
return _selectedNode.valid();
}
Thank you!
Cheers,
Sanat
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http://forum.openscenegraph.org/viewtopic.php?p=37328#37328
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Re: [osg-users] Trouble Understanding osgPick (pick example QSG)
Hi Sanat, Code: const osg::NodePath nodePath = picker-getFirstIntersection().nodePath; is only giving you the first intersection, which may not be either of your models (it could be terrain, for example). I'm guessing you need to search the entire set rather than just trying the first intersection. Code: Intersections osgUtil::PolytopeIntersector::getIntersections () typedef std::setIntersection osgUtil::PolytopeIntersector::Intersections Cheers, Tom -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=37335#37335 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Trouble Understanding osgPick (pick example QSG)
Thanks Tom. I will try that out. Cheers, Sanat. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=37342#37342 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Trouble Understanding osgPick (pick example QSG)
Hi, I have read through the example in the QSG (quick start guide) as well as example programs for the Picking behavior. I know how the eventAdapter, handle(), etc works. My problem is: In my ctor for picking class I set the two nodes for which I want to check if any of them have been picked. Given that I have the nodePath from the intersector, how can I check if the node I am interested in is in the nodePath ? (I tried using getName and setName but that didn't help) Any help in this matter would be great! (If my explanation has not been clear, I would be happy to re-post) Thanks in advance. Sincerely, Sanat -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=37303#37303 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Trouble Understanding osgPick (pick example QSG)
osg::NodePath is: typedef std::vector Node* osg::NodePath Since you have two Node*s that you're looking for, you can iterate through the NodePath just like any other vector and compare your pointer to the pointers in the vector. You could also apply your intersection visitor to the nodes you're interested in rather than the scene root and just check if it intersects with anything in that case. I haven't worked with intersectors in a while though so I may be wrong. Cheers, Tom -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=37307#37307 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
