[osg-users] osgvolume: Swap technique in a VolumeScene fails

[Julien Valentin]

Thanks for your answer 
I have already change my original post with an attached example but this update doesnt appear in the mailing list
So i repost it for the mailing list

robertosfield wrote:
> Hi Julien,
> 
> I have done a quick code review of MultipassTechnique and the
> computeRenderingMode() could easily be changed to check for whether
> the _volumeTile is set to avoid this specific crash, but I suspect the
> root cause of the problem is elsewhere - a technique should have a
> valid _volumeTile when it's in usage.  As soon as you assign a
> technique to a VolumeTile the VolumeTile::setVolumeTechnique() method
> sets the technique's _volumeTile pointer to itself.
> 
> I therefore suspect somehow you've created a technique but not
> assigned one to a tile, but also somehow got it to be actively used.
> You might be doing things correctly and there is a bug that is
> lurking, or it could be something odd that you are doing.
> 
> Could you create/modify and example to illustrate this crash?
> 
> Robert.
> 
> On 9 June 2015 at 07:36, Julien Valentin <> wrote:
> 
> > Hi,
> > 
> > First, excuse the lack of details of the further, i haven't been able to debug enough to understand where the bug is...
> > 
> > So, I tried a simple scenario with the osgvolume::MultipassTechnique:
> > I initialize the volume rendering with MultipassTechnique (as in the example)
> > And at runtime I change it to a new osgvolume::MultipassTechnique
> > It yields a weird crash in  MultipassTechnique::computeRenderingMode()
> > with _volumetile==NULL ...?!
> > 
> > So far I've debugged a lot but haven't been able to locate where that happen
> > Any info would been welcome
> > 
> > Thank you in advance
> > Have a good day!
> > 
> > Cheers,
> > Julien
> > 
> > ------------------
> > Read this topic online here:
> > http://forum.openscenegraph.org/viewtopic.php?p=63992#63992
> > 
> > 
> > 
> > 
> > 
> > _______________________________________________
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> > 
> > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> > 
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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=63997#63997



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