Hi, it surely is the duplicate of http://forum.openscenegraph.org/viewtopic.php?t=14304 I thought this issue was fixed since all this time The hack i use is there curious bug indeed, and so curious solution too @robert Perhaps it may be merged into master...your call...
cheers Clement wrote: > Hi, > > Finally I found where causes the problem. For some reasons, gl_Vertex is not > normalized. I looked at osg shader source code (src\osgVolume\Shaders). For > example, in file volume_frag.cpp, > > vec4 t0 = vertexPos; > vec4 te = cameraPos; > > // by default te did to check the range (0 and 1), but t0 did not. > // If I added some codes to check the range, then the problem is completed > gone. > > if (t0.x<0.0) t0.x = 0.0; if (t0.x>1.0) t0.x = 1.0; > if (t0.y<0.0) t0.y = 0.0; if (t0.y>1.0) t0.y = 1.0; > f (t0.z<0.0) t0.z = 0.0; if (t0.z>1.0) t0.z = 1.0; > > > I believe the problem is related to GLSL version and latest Intel HD Graphics > driver is using higher version of GLSL, but gl_Vertex does not normalize or > the value is just over 1 or less then 0 (eg. 1.00001). Then it causes the > crash when running the sampling loop. I am not an expert on GLSL, so I would > like to confirm the best solution to handle this problem. Thanks. > > > Regards, > Clement Chu > > ________________________________________ > From: osg-users <> on behalf of <> > Sent: Wednesday, 30 August 2017 17:31 > To: > Subject: [ExternalEmail] RayTracedTechnique hangs with Intel HD Graphics > > Hi, > > My program uses RayTracedTechnique for volume rendering, but it hangs with > Intel HD graphics 520, 530 and 620. My old laptop works fine which is using > Intel HD Graphic 3000. Other machines with Nvidia cards are working fine > too. I believe the problem is on shaders in the sampling loop. My program > is using osg 3.2.3. I also tried to upgrade to osg 3.4.1, but the same > problem occurred with Intel HD Graphic 520, 530 and 620. Do anyone have > similar problem and any solution to fix it? Many thanks. > > > Regards, > Clement Chu > _______________________________________________ > osg-users mailing list > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ > osg-users mailing list > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > ------------------ > Post generated by Mail2Forum ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=71606#71606 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
