[osg-users] Volume image crash on the latest version of Nvidia driver

[Robert Osfield]

Hi Clement,


On 5 August 2015 at 17:06, <Clement.Chu at csiro.au> wrote:

>   Thanks for your help to test the problem.  Please find the attachment of
> my test data.   I tested with my laptop (Nvidia NVS 5200M with driver
> 353.62) and used osg 3.2.1 x64 windows version.  The command is:
>
> osgviewer t1.osg
>

Thanks for the model.

I've run it on my Kubuntu system with Geforce GTX 760 + 346.59 drives and
get a hang on my system when I rotate the view.  This happens with OSG
svn/trunk (equivalent to OSG-3.4).  When I run osgvolume t1.dds I get the
hang as well.  Given the nature of the hang and how it locks out the whole
desktop it all points to GPU/driver issue of some kind.

If I run:

  osgvolume t1.dds --multi-pass

I don't get any hang.  The osgVolume::MultiPassTechnique is only part of
OSG-3.4 so you won't have this option when using OSG3.2.1.  By default
osgvolume still defaults to the old RayTracedTechnique that you'll be
familiar with, so I would suspect an issue with how the GPU is managing the
RayTracedTechnique GLSL shaders.


The thread that Julian Valentin linked discusses potentially the same
issue, although the GLSL code Julian suggesting could be changed looks
valid and the fix a workaround to otherwise valid code.  I will do a review
of the shaders to see I can spot a problem.

Robert.
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