Sorry if I don't quite understand the GUI/render thread
distinction...(learning as I go :)
Pseudo code for adding/deleting is as follows, (all in the same (and only)
thread,which receives GUI events)
on_key_press()
{
toggle = ! toggle
if (toggle)
addTextToScene()
else
removeAndDeleteTextFromScene()
}
on_timer_event() // timer event occurs 30 times a second
{
renderScene() (calls the render function I quoted earlier)
}
On Wed, Oct 8, 2008 at 3:05 PM, Tomlinson, Gordon <
[EMAIL PROTECTED]> wrote:
> Were are you changing, adding, removing etc the text.
>
> You need to ensure you are updating only in the APP thread ( not a gui
> thread )
> From the snippet below, you need to do this in the Render function ( or
> that thread ) or in the Update traversal
>
>
> *Gordon*
>
> __________________________________________________________
> *Gordon Tomlinson*
>
> *Product Manager 3D
> **Email * : gtomlinson @ overwatch.textron.com
> __________________________________________________________
> *(C): (+1) 571-265-2612
> (W)**: (+1) 703-437-7651*
>
> "Self defence is not a function of learning tricks
> but is a function of how quickly and intensely one
> can arouse one's instinct for survival"
> - *Master Tambo Tetsura*
>
>
>
> ------------------------------
> *From:* [EMAIL PROTECTED] [mailto:
> [EMAIL PROTECTED] *On Behalf Of *Chris
> *Sent:* Wednesday, October 08, 2008 2:48 PM
> *To:* OpenSceneGraph Users
> *Subject:* Re: [osg-users] osgText crash
>
> Thanks Robert,
>
> I do realize it's tough to tell without seeing the code. Up to yesterday I
> used osg 2.1, but just upgrade to 2.7.1 (bug still occurs). FWIW, I'm not
> using the viewer setup in the examples, I use my own osgUtil::SceneView and
> use cull & draw directly. Note I setup my viewport properties on each
> rendered frame, as these are animated. The basic code is like:
>
> void render()
> {
> osgProducer::OsgSceneHandler *sh =
> dynamic_cast<osgProducer::OsgSceneHandler *> ( _cam.getSceneHandler() );
> osgUtil::SceneView* sv = sh->getSceneView();
> sv->setSceneData( (osg::Node *) getSceneNode(0) );
> osg::State* state = sv->getState();
> state-> dirtyColorPointer();
>
> sv->setProjectionMatrix( projection );
> sv->setViewMatrix( *_viewMatrix );
> sv->setViewport( clippedViewport.x, clippedViewport.y,
> clippedViewport.xdim, clippedViewport.ydim );
>
> //sv->update(); no anims, no need to update ?
> sv->cull();
> sv->draw();
> }
>
>
> On Wed, Oct 8, 2008 at 2:13 PM, Robert Osfield <[EMAIL PROTECTED]>wrote:
>
>> Hi Chris,
>>
>> With so few details about your viewer setup and scene graph usage the
>> best we can do is guess what you might have done wrong given other
>> common mistakes we see pop up - have the DataVariance recommendation.
>>
>> Another thing you could try setting the threading model on the viewer
>> by calling
>>
>> viewer.setThreadingMode(osgViewer::Viewer::SingleThreaded);
>>
>> Again it's a long shot given we really don't know enough about the OSG
>> version you are using, which viewer library/classes and the fact
>> you're trying to control everything thing through swig wrappers.
>>
>> Robert.
>>
>> On Wed, Oct 8, 2008 at 7:04 PM, Chris <[EMAIL PROTECTED]> wrote:
>> > I had just read the osg archive and set the text DataVariance to
>> DYNAMIC,
>> > with high hopes..unfortunately still crashes :(
>> >
>> > _text->setDataVariance(osg::Object::DYNAMIC);
>> >
>> > I create my Text in response to a keystroke, and add it to the scene.
>> The
>> > next keystroke removes and deletes it. Each time I create it, the
>> initial
>> > rendered text string does not change.
>> >
>> > ( Also set my loaded osgText::Font to DYNAMIC DataVariance, doesn't
>> help. )
>> >
>> > BTW I noticed there were some nvidia problems in the archives; I do have
>> an
>> > NVidia driver (my machine is a Toshiba Tecra M4, Geforge Go 6200 (three
>> > years old), driver date 3/14/2005, version 7.1.4.1 )
>> >
>> > as per your StateSet DataVariance comment, should i do that as well ?
>> I'm
>> > not familiar with osg's thread models, but I just call render within my
>> > app's main thread, and I dont' explicitly create other threads myself.
>> >
>> > On Wed, Oct 8, 2008 at 1:21 PM, Paul Melis <[EMAIL PROTECTED]> wrote:
>> >>
>> >> Robert Osfield wrote:
>> >>>
>> >>> Are you dynamically updating the text each frame? If so set the
>> >>> DataVariance to DYNAMIC.
>> >>>
>> >>
>> >> Hmmm, if setting it to STATIC causes a crash like this, might that be a
>> >> design flaw?
>> >>
>> >> Paul
>> >>
>> >>> Robert.
>> >>>
>> >>> On Wed, Oct 8, 2008 at 6:09 PM, Chris <[EMAIL PROTECTED]> wrote:
>> >>>
>> >>>>
>> >>>> Hi,
>> >>>>
>> >>>> I'm having semi-random crash bugs when I add an osgText drawable to
>> my
>> >>>> scene. The actual error is a mem access violation, and it occurs
>> after
>> >>>> I've
>> >>>> added & removed the node containing the drawable from the scene a
>> random
>> >>>> number of times' (usually from 1 to 10 times)
>> >>>>
>> >>>> The exception occurs in the same place in the call stack, apparently
>> >>>> somewhere in my open gl .dll (nvoglnt.dll). One thing that puzzles me
>> is
>> >>>> that I'm using SWIG, and from the call stack the function
>> >>>> PySwigObject_Check(PyObject *op) ) seems to call into the osgUtil
>> .dll,
>> >>>> which in about 10 stack layers ends up calling nvoglnt.dll. I don't
>> know
>> >>>> why
>> >>>> 'PySwigObject_Check' would be caling the osg .dll, (see func copied
>> >>>> below),
>> >>>> but maybe some sort of wierd thread confusion ?
>> >>>>
>> >>>> SWIGRUNTIMEINLINE int
>> >>>> PySwigObject_Check(PyObject *op) {
>> >>>> return ((op)->ob_type == PySwigObject_type())
>> >>>> || (strcmp((op)->ob_type->tp_name,"PySwigObject") == 0);
>> >>>> }
>> >>>>
>> >>>> The crash does NOT occur if I repeatedly create/delete the osgText
>> >>>> drawable
>> >>>> but don't add it to my scene. It does not crash during the render but
>> >>>> seems
>> >>>> to corrupt something that fails elsewhere (apparently in
>> >>>> 'PySwigObject_Check' )
>> >>>>
>> >>>> While I can't be certain it's not my code, I have been running the
>> same
>> >>>> render code (which uses osg) now for a few years without problems.
>> Note
>> >>>> that I dont explictly create extra threads in my code, beyond what
>> osg
>> >>>> might
>> >>>> be doing.
>> >>>>
>> >>>> I thought this looked like some thread/mutex problem, or pehaps a
>> VC++
>> >>>> STL
>> >>>> problem (anyone had these issues with osg Text before?) I created a
>> >>>> new
>> >>>> version of osgText that hacks out the STL-based 'String' class used
>> to
>> >>>> 'setText', but no dice.
>> >>>>
>> >>>> I was running on WinXP, using compiler: Visual Studio .net 2002. I
>> just
>> >>>> installed Osg 2.7.1, and Visual Studio Express 9.0; but the crash
>> still
>> >>>> occurs.
>> >>>>
>> >>>> TIA,
>> >>>> Chris
>> >>>>
>> >>>> --
>> >>>> www.sketch3.com
>> >>>>
>> >>>> _______________________________________________
>> >>>> osg-users mailing list
>> >>>> [email protected]
>> >>>>
>> >>>>
>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>> >>>>
>> >>>>
>> >>>>
>> >>>
>> >>> _______________________________________________
>> >>> osg-users mailing list
>> >>> [email protected]
>> >>>
>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>> >>>
>> >>
>> >> _______________________________________________
>> >> osg-users mailing list
>> >> [email protected]
>> >>
>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>> >
>> >
>> >
>> > --
>> > www.sketch3.com
>> >
>> > _______________________________________________
>> > osg-users mailing list
>> > [email protected]
>> >
>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>> >
>> >
>> _______________________________________________
>> osg-users mailing list
>> [email protected]
>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>>
>
>
>
> --
> www.sketch3.com
>
> _______________________________________________
> osg-users mailing list
> [email protected]
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
>
--
www.sketch3.com
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