Re: [osg-users] LineSegmentIntersector which objects are returned?
Hi Robert,
robertosfield wrote:
Secondly the intersections you get returned return the leaf node and
drawable that is intersected along with the node path from the root of
the intersection traversal down to the leaf node that was intersected.
you found my problem: I forgot that the demo access only the leaf node, so I
can solve may problem by searching right node on nodePath.
But I can't use nodePath like expected. To play a little bit with the nodePath
I wanted to print all names of nodes
So my first try was:
Code:
bool nodeFound = false;
for(osgUtil::LineSegmentIntersector::Intersections::iterator hitr =
intersections.begin(); hitr != intersections.end(); ++hitr)
{
osg::NodePath path = hitr-nodePath;
for(osg::NodePath::iterator hitNodeIt = path = hitr-nodePath.begin();
hitNodeIt != path = hitr-nodePath.end(); ++hitNodeIt)
{
if (hitNodeIt-getName())
{
nodeFound = true;
std::cout hitNodeIt-getName();
}
}
if (nodeFound) break;
}
Then I got:
IntelliSense: Es ist keine passende benutzerdefinierte Konvertierung von
std::_Vector_const_iteratorstd::_Vector_valosg::Node *,
std::allocatorosg::Node * in
std::_Vector_iteratorstd::_Vector_valosg::Node *,
std::allocatorosg::Node * vorhanden.
So I tried this:
Code:
bool nodeFound = false;
for(osgUtil::LineSegmentIntersector::Intersections::iterator hitr =
intersections.begin(); hitr != intersections.end(); ++hitr)
{
for(osg::NodePath::const_iterator hitNodeIt = hitr-nodePath.begin();
hitNodeIt != hitr-nodePath.end(); ++hitNodeIt)
{
if (hitNodeIt-getName())
{
nodeFound = true;
std::cout hitNodeIt-getName();
}
}
if (nodeFound) break;
}
But this won't compile too:
error C2039: 'getName': Ist kein Element von
'std::_Vector_const_iterator_Myvec'
error C2839: Ungültiger Rückgabetyp 'osg::Node *const *' für überladenen
Operator '-'
IntelliSense: Der Ausdruck muss den Typ pointer-to-class aufweisen.
Any idea?
Heiko
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Re: [osg-users] LineSegmentIntersector which objects are returned?
Hello Heiko, But this won't compile too: error C2039: 'getName': Ist kein Element von 'std::_Vector_const_iterator_Myvec' error C2839: Ungültiger Rückgabetyp 'osg::Node *const *' für überladenen Operator '-' IntelliSense: Der Ausdruck muss den Typ pointer-to-class aufweisen. Any idea? I think you just need to check the types of what you're using... hitNodeIt is an osg::NodePath::iterator. This expands to std::vectorosg::Node*::iterator (you are in Visual Studio, so you can press F12 with the cursor on osg::NodePath to see what type it really is, you'll see it's a typedef of std::vectorosg::Node* or something similar). So to be able to call getName() you need to do: (*hitNodeIt)-getName() Hope this helps, J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.webhop.org/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] LineSegmentIntersector which objects are returned?
Hi, you are right :). I tried this myself before and saw that VS show me nevertheless an error. But didnt seen that the error message changed (I had forgot the .empty() on comparism) ;) Thank you! Cheers, Heiko -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=36562#36562 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] LineSegmentIntersector which objects are returned?
Hi Heiko, I'm afraid I can't work out what is going on from your description so the best I can do is provide some general suggestions. First up only polygonal meshes can be interested by LineSegmentIntersector, so point clouds and lines will not return intersections. Secondly the intersections you get returned return the leaf node and drawable that is intersected along with the node path from the root of the intersection traversal down to the leaf node that was intersected. Robert. On Sun, Feb 6, 2011 at 11:12 PM, Heiko Thiel osgfo...@tevs.eu wrote: Hi, I have a simple question to LineSegmentIntersector: Which objects can be intersect with the test ray? I ask because I have following problem: I have following osg tree: - Geode -Field - Node (Model loaded from disc) - Contains Name obj1 by Model (so not set by my - don't want to presume that the name is everytime same) - Geode (single quad of the ground of terrain) - Name: Ground - Geometry (4 vertices) If I do now a klick I got following names returned: obj1, obj1, obj, ..., Ground (Model is a Firetree - many intersections). But never the name Field. So the problem is: I can't assume that the Model has name obj1. That is why I think I must additional geode around it with an extra class, so I can check with dynamic_cast if the test ray had found an interesting object or not. But this don't work, if I dont get the Field-Geode returned. How to handle this problem? (osgPick-Demo is to simple to see a solution :( ) Thank you! Cheers, Heiko -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=36399#36399 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] LineSegmentIntersector which objects are returned?
Hi, I have a simple question to LineSegmentIntersector: Which objects can be intersect with the test ray? I ask because I have following problem: I have following osg tree: - Geode -Field - Node (Model loaded from disc) - Contains Name obj1 by Model (so not set by my - don't want to presume that the name is everytime same) - Geode (single quad of the ground of terrain) - Name: Ground - Geometry (4 vertices) If I do now a klick I got following names returned: obj1, obj1, obj, ..., Ground (Model is a Firetree - many intersections). But never the name Field. So the problem is: I can't assume that the Model has name obj1. That is why I think I must additional geode around it with an extra class, so I can check with dynamic_cast if the test ray had found an interesting object or not. But this don't work, if I dont get the Field-Geode returned. How to handle this problem? (osgPick-Demo is to simple to see a solution :( ) Thank you! Cheers, Heiko -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=36399#36399 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
