Let's say I want to change the color of my road segment (when selected for
instance). We're currently doing this modification that way:
osg::Vec4Array* lCouleur =
(osg::Vec4Array*)(mGeometrie->getColorArray());
*(lCouleur->begin()) = pCouleur;
mGeometrie->dirtyDisplayList();
>From what you're saying, I guess we should create a different stateset for
>every color instead of a stateset for every segment? Maybe I should ask first
>if the color is indeed part of the stateset anyway! If not, we could reduce
>the stateset count even more!
Thanks!
Frederic Drolet, M. Sc.
Computing Solutions and Experimentations | Solutions informatiques et
expérimentations
Systems of Systems | Systèmes de systèmes
DRDC Valcartier | RDDC Valcartier
2459, boul. Pie-XI North
Quebec, Quebec
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-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Thrall, Bryan
Sent: Friday, March 12, 2010 10:39 AM
To: OpenSceneGraph Users
Subject: Re: [osg-users] Multi-view Performance Issue with Statesets
Drolet, Frederic wrote on 2010-03-12:
> osg::ref_ptr<osg::StateSet> lStateSet = mGeometrie-
>> getOrCreateStateSet();
>
> lStateSet->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
OpenGL performance is very sensitive to state changes, so it is a good idea to
minimize them as much as possible. OSG groups Drawables with the same state as
part of this (the exception is transparent drawables that require a certain
ordering to render correctly, so they can't be grouped), but it just compares
the StateSet pointers rather than a (much more expensive) comparison of what
OpenGL state the StateSet pointers represent.
Therefore, if you have a bunch of StateSets that are identical, like you seem
to have, it is a really good idea to just use the same StateSet object
everywhere you need it, rather than create a new instance every time.
HTH,
--
Bryan Thrall
FlightSafety International
[email protected]
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