Hi Clement,
On 5 August 2015 at 17:06, <clement....@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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