Hi Matthias,
Since 2.0 I have integrated a bug fix into osgViewer to handle the
case of no scene graph being assigned before realize(), so this will
probably fix the crashes you've seen.
Robert.
On 8/29/07, Matthias Weigand <[EMAIL PROTECTED]> wrote:
> Thanks for your effort.
>
> The code wasn't pseudo code. It compiled well. Of course it is useless
> but it shows my problem.
> Here is what i found out:
>
> ===================================
>
> osg::Group* root = new osg::Group();
> Viewer* wnds = new Viewer();
> wnds->setSceneData(root); // <--- crashing here
> wnds->setUpViewOnSingleScreen();
> wnds->realize();
>
> ===================================
>
> Viewer wnds;
> wnds.setUpViewOnSingleScreen();
> wnds.realize(); // <--- crashing here
>
> ===================================
>
> osg::Group* root = new osg::Group();
> Viewer wnds;
> wnds.setSceneData(root);
> wnds.setUpViewOnSingleScreen();
> wnds.realize();
>
> //working!!!!!!!
>
> ===================================
>
> Comparing example 1 and 3:
> I was wondering, whats the big difference here between using a pointer
> (doesn't matter if a ref_ptr or plain C-pointer) and the stack. It
> should just be a matter of where i want my memory to be allocated and
> how to proceed with the memory, if the variable or pointer gets out of
> scope. Is the new operator overloaded?
>
> In example 2 it seems a call to setSceneData() is very important for the
> viewer class....
>
> Any comments?
>
> However, nice to see it working now.
>
> Thanks
> -- Matthias
>
>
>
>
> Robert Osfield wrote:
> > Hi Mathias,
> >
> > On 8/29/07, Matthias Weigand <[EMAIL PROTECTED]> wrote:
> >
> >> thanks for your reply. I switched to using the Viewer class. The code is:
> >>
> >> #include <osgViewer/Viewer>
> >> using namespace osg;
> >> int main()
> >> {
> >> osgViewer::Viewer* wnds = new osgViewer::Viewer();
> >> wnds->setUpViewOnSingleScreen();
> >> wnds->realize();
> >> return 0;
> >> }
> >>
> >> Calling realize() crashes my app with a segfault.
> >> No error message is written to stdout or stderr during execution.
> >>
> >> I'm using Visual Studio 8 on WinXP Pro SP2 (32-bit).
> >> My OpenSceneGraph version is the official stable 2.0.
> >> I build up a clean project with include-dir
> >> D:\SDK\OpenSceneGraph\include and lib-dir D:\SDK\OpenSceneGraph\lib and
> >> osg.lib as additional library. No ATL, no MFC, nothing.
> >>
> >> What may cause such a problem?
> >>
> >
> > I presume your code extract is psedo code as it has a number of issues.
> >
> > First up if you are going to create a viewer on the heap via new use
> > ref_ptr<Viewer> instead of a C pointer to make sure the memory is
> > cleaned up correctly.
> >
> > Second, there is now scene assignment i.e.
> > viewer.setSceneData(mySceneGraph);
> >
> > Third, your realize the viewer but then do run any frame loop of any
> > kind, so you at minimum need to add a viewer.run().
> >
> > All of this illustrated in the examples.
> >
> > Robert.
> > _______________________________________________
> > osg-users mailing list
> > [email protected]
> > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> >
> >
>
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