Hello everyone,
I've been working with OpenSG for some months now, building a VR-tool for a
microassembly station during my diploma thesis here at the "Swiss Federal
Institute of Technology" in Zürich.
So far I've been pretty satisfied with OpenSG but I recently ran into some
problems, which I can't seem to manage myself anymore.
Therefore any hint or help would be deeply appreciated. (Especially since I
have to finish the project in three weeks...).
I am using one of the recent OpenSG cvs builds (from last week).
In my project I use a GUI created with Qt and Qt-Designer Version 4.2.1.
Furthermore I have a plugin widget for the designer which creates a graphical
widget to render OpenSG content into the GUI. (SGWidgetPlugin returns "class
SGWidgetOSG : public OSG::OSGQGLWidget" to designer ).
-> In SGWidgetOSG I use my own helper classes (which themselfs use OpenSG) to
perform setting up the scenegraph, picking, navigating and so forth... (because
the OSG::SimpleSceneManager is a little bit to restrictive for me).
I managed to get my plugin showing up in designer, so it can be used just like
any other widget in designer. (Designer even shows the OSG::Viewport with a
gradient background I setup in my widget).
But now I have 2 probs:
1.) ###################################################################
The problem I have now when starting my test-applications is that I get a
>terminate called after throwing an instance of 'std::logic_error'
> what(): basic_string::_S_construct NULL not valid
>Aborted
error as soon as I'm calling
"/*OSGQT(4)WindowPtr*/_window->init();"
I'm really not sure if this error has anything to do with my widgets because I
get the same error with another one of my VR-applications where I'm testing a
collision detection library.
There I get the same error when calling
"OSG::traverse( node,
OSG::osgTypedFunctionFunctor1CPtrRef<OSG::Action::ResultE, OSG::NodePtr>(
&StaticCollector::enter ),
OSG::osgTypedFunctionFunctor2CPtrRef<OSG::Action::ResultE, OSG::NodePtr>(
&StaticCollector::leave ) );"
Both my widget and the scenegraph traversing worked fine when I was still using
libOSGWindowQT instead of libOSGWindowQT4.
As far as I know this comes form something like "std::string s(NULL);"
What I do before calling either function is:
In my GUI-Application
before "OSG::QT(4)Window::init()"
int
main( int argc, char ** argv )
{
SGWidgetOSG::initOSG(argc, argv); //osgInit( argc, argv );
QApplication app( argc, argv );
SGDockingWidget sgdw; // comes form SGDockingWidget.ui which uses
SGWidgetOSGs
// app.setMainWidget(& sgdw);
sgdw.show();
/*
within show() SGWidgetOSG::initializeGL() is called where I setup my
OSG::Viewport, navigators, cameras and lights (nothing's wrong here, because it
worked perfectly with libOSGWindowQT)
and after that _window->init() is called -> crash ...
*/
return app.exec();
}
In my collision detection testapplication
before "OSG::traverse()":
int
main( int argc, char ** argv )
{
osgInit( argc, argv );
QApplication( argc, argv ) app;
QMainWindow win;
//QGLWidget qgl(&win);// crash also with the QGLWidget
win.show();
OSG::NodePtr node = OSG::makeCoredNode<OSG::Group>();
OSG::beginEditCP( node );
node->addChild( OSG::makeNodeFor( OSG::makeBoxGeo( 1, 1, 1, 1, 1, 1) ) ); //
was also tested with complete vrml model
OSG::endEditCP( node );
VRControlCenter vr_ctrl( node );
vr_ctrl.configure( "path/to/my/xml/configuration/file" );
/*
One of the first things the VRControlCenter does when its configuring, is
to call OSG::traverse() on the node its been constructed with to check
what kinds of nodes are around in the scenegraph and on calling
OSG::traverse() the std::logic_error crash appears...
*/
return app.exec();
}
I must be doing something wrong during setup, but I have been staring to long
at all my code and I just can't figure it out.
2.) ###################################################################
I then also tried to put some debugging messages into OSGQT4Window.cpp
"WindowQT::init()" and tried to recompile, but I always get the same compile
errors when compiling libOSGWindowQT4.
I use:
g++ -v = gcc version 4.2.1 20061115 (prerelease) (Debian 4.1.1-21)
moc -v = Qt Meta Object Compiler version 59 (Qt 4.2.1)
OpenSG cvs version of today (22. Jan. 2007).
>./configure --enable-glut --enable-tif --enable-png --enable-jpg --enable-qt4
>--with-qt4=/usr
>--with-add-incdir=/usr/include/qt4/Qt:/usr/include/qt4/QtCore:/usr/include/qt4/QtGui:/usr/include/qt4/QtNetwork:/usr/include/qt4/QtOpenGL:/usr/include/qt4/Qt3Support:/usr/include/qt4/QtDBus:/usr/include/qt4/QtDesigner:/usr/include/qt4/QtSql:/usr/include/qt4/QtSvg:/usr/include/qt4/QtTest:/usr/include/qt4/QtUiTools:/usr/include/qt4/QtXml
Then when trying to compile I get:
>OpenSG/Source/WindowSystem/QT4/OSGWindowQT4Plugin_qt.h: 92: Error: Undefined
>interface
and if I add the <QDesignerExportWidget> and QDESIGNER_EXPORT and
Q_EXPORT_PLUGIN2(...) stuff to OSGWindowQT4Plugin_qt.* I get:
>OpenSG/Source/WindowSystem/QT4/OSGWindowQT4Plugin_qt.h: 0: Warning: No
>relevant classes found. No output generated.
>obj-dbg/OSGQ4SceneGraphView_qt_moc.cpp:11:2: error #error "The header file
>'OSGQ4SceneGraphView_qt.h' doesn't include <QObject>"
The "doesn't include <QObject>" error also appears for OSGQ4NodeTreeView,
OSGQ4GLWidget, OSGQ4GLManagedWidget, OSGQ4GLManagedDesignerWidget,
OSGQ4FieldEditor, OSGQ4FieldContainerView,...
I got the same problems when compiling the first time, but I'm not sure any
more how I finally got it to compile -> doing some magic "sudo and su" special
permissions things in /tmp/OpenSG.
I found something on the topic on:
http://lists.trolltech.com/qt4-preview-feedback/2005-04/thread00475-0.html
But I'm not sure what to make of it...
Thank you very much for any help.
Regards,
Christoph
PS: I get the same compile errors on my laptop using fedora and Qt 4.1
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