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_cast<osg::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
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=37328#37328
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