OK, I'll do my best...
My app is a Qt app and I'm using AdapterWidget in single threaded mode as
recommended.
My global scene is a switch "bigScene" and one child is my node "scene" which
is also a switch.
Both are permanent variables stored using osg::ref_ptr.
"scene" has many leaves, each representing a yarn in the textile.
They are just temporary variables attached to the "scene" by calling
scene->addNode(yarnNumber, yarn.get());
or after changes by
scene->setNode(yarnNumber, yarn.get());
Also the temporaryly used nodes are stored in osg::ref_ptr.
Now it comes to dynamic:
Physical effects changing the "fabric" are calculated in threads but the
results are giveb to my view in the main display thread - this is ensured!
When knowing the yarn has changed, I create a NEW geometry, attach it to a NEW
yarn node and call "scene->setNode(...);" as described above. So everything is
done in one single main thread.
What I recognized is:
1) When just calling "scene->setNode(...);" the displayed scene doesn't
change.
2) When calling "bigScene->setNode(0), scene.get()" again, I see all my
changes.
My questions:
1) Is it recommended to replace some node just like that? Any problems with
caching etc.?
2) Why does "bigScene" not recognize the change of the leafes?
Also when doing big fabrics and using trackball frequently the program is
terminated with a message like "Error from GL driver" (not exact).
I hope I could give you enough info. Thanks for your kind support.
- Werner -
On Thursday 16 September 2010 11:56:02 Robert Osfield wrote:
> Hi Werner,
>
> Could you back out a bit, and introduce the problem your are tackling
> at a high level so that others get a picture about what you are trying
> to achieve, diving into what solution you've code is often premature.
>
> From what I can gather integration of the simulation code and
> rendering code is at the core of what you are trying to achieve.
> Could you explain more about the simulation code, such as how it's
> threaded, is synchronous to the rendering thread etc. Also on the
> rendering side, how do you want to render it?
>
> Robert.
>
> On Thu, Sep 16, 2010 at 10:36 AM, Werner Modenbach
>
> <[email protected]> wrote:
> > OK Robert,
> >
> > I still have the impression I have exactly the same case as Dženan.
> > But if you prefer I'll open a new thread.
> > I'm using AdapterWidget in Qt and I'm running it single threaded as
> > Dženan does.
> > I'm replacing a node in the scene graph by a newly created one.
> >
> > Here is my scene hierarchie:
> >
> > osg::ref_ptr<osg::Switch> bigScene; // The whole scene
> >
> > My textile:
> > osg::ref_ptr<osg::Switch> scene; // Textile fabric
> > attached to the whole scene by
> > bigScene->setNode(0, scene.get());
> >
> > scene has many nodes representing one textile thread each, defines as
> > osg::ref_ptr<osg::Node> yarn;
> > attached to scene by
> > scene->setNode(yarnNumber, yarn.get());
> >
> > I sayed I have to recalculate the geometry of the yarn nodes frewuently.
> > This is done by creating a NEW geometry and a NEW yarn node, the
> > replacing the old yarn node by the new one calling:
> > scene->setNode(yarnNumber, yarn.get());
> >
> > So what I actually do is replacing an existing node by a new one.
> > When doing just that, my bigScene doesn't recognize the changed leafes.
> > But after calling
> > bigScene->setNode(position, scene.get());
> >
> > again - with the same scene.get() as before - the changes were recognized
> > immediately.
> > I know my approach maybe incorrect but I'm also just at the beginning of
> > my work with osg.
> >
> > - Werner -
> > _______________________________________________
> > osg-users mailing list
> > [email protected]
> > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
> _______________________________________________
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--
TEXION Software Solutions
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Geschäftsführer/Managing Director: Werner Modenbach
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