[Opensg-users] Problem recreating a scene

[Pablo Carneiro Elias]

Hi all,

I've recently updated our version of OpenSG to the current svn version and
we're experiencing a problem when we try to re-open a project (destroy the
whole scene
and the window and create a new one).

The problem occurs right when we call init() method of the PassiveWindow,
immediately after re-creating it.

Tracking the error lead us to the following call stack:

     msvcr80d.dll!strlen(unsigned char * buf=0x0012f9d4)  Line 81    Asm
     msvcp80d.dll!std::char_traits<char>::length(const char *
_First=0x00000000)  Line 559 + 0x9 bytes    C++

msvcp80d.dll!std::basic_string<char,std::char_traits<char>,std::allocator<char>
>::assign(const char * _Ptr=0x00000000)  Line 1080 + 0x9 bytes    C++
     OSGSystemD.dll!OSG::Window::setupGL()  Line 1889 + 0x2d bytes    C++
     OSGSystemD.dll!OSG::Window::init(boost::function<void
__cdecl(void),std::allocator<void> > oFunc={...})  Line 2280 + 0x12 bytes
C++


The first time init() is called, everything works fine.. however the problem
occurs if we try to re-create the window.

To assure ourselves we weren't doing anything wrong, we created a small
program based on the simple example of yours (hello01.cpp)
that creates a simple scene, and by pressing a key, destroys the window and
re-creates it (along with the scene).

The exact same error occurs (as listed above by the call stack).
The folowing code are the modifications of the example ( hello01.cpp )
stated above:

void createScene()
{
    // create the scene
    OSG::NodeUnrecPtr scene = OSG::makeTorus(.5, 2, 16, 16);

    OSG::commitChanges();

    // create the SimpleSceneManager helper
    mgr = new OSG::SimpleSceneManager();

    // tell the manager what to manage
    mgr->setWindow( gwin );
    mgr->setRoot  ( scene );
}

OSG::GLUTWindowTransitPtr createWindow()
{
    gwin = OSG::GLUTWindow::create();
    return OSG::GLUTWindowTransitPtr( gwin );
}

void destroyScene()
{
    gwin = 0;
    delete mgr;
    mgr = 0;
}

// Initialize GLUT & OpenSG and set up the scene
int main(int argc, char **argv)
{
    // OSG init
    OSG::osgInit(argc,argv);

    // GLUT init
    glutid = setupGLUT(&argc, argv);

    // the connection between GLUT and OpenSG
    gwin = createWindow();
    gwin->setGlutId(glutid);
    gwin->init();
    createScene();

    // show the whole scene
    mgr->showAll();


    // GLUT main loop
    glutMainLoop();

    return 0;
}

// react to keys
void keyboard(unsigned char k, int x, int y)
{
    switch(k)
    {
        case 27:
        {
            // clean up global variables
            destroyScene();

            OSG::osgExit();
            exit(0);
        }
        break;

        case 's':
        {
            mgr->setStatistics(!mgr->getStatistics());
        }
        case 'r': // rebuild
            destroyScene();
            createWindow();
            gwin->setGlutId(glutid);
            gwin->init();
            createScene();
            mgr->showAll();

        break;
    }
}


Thanks, and best regards,
Pablo Elias

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