[osg-users] Offscreen rendering with multisampling

[Krzysztof Rahn]

Wojtek wrote:
> Hi Krzysztof,
> 
> Not sure about PBO but FBO support in OSG works with multisampling. 
> See  
> 
> 
> 
> Camera::attach(
>   BufferComponent buffer, 
>   osg::Texture* texture, 
>   unsigned int level, 
>   unsigned int face, 
>   bool mipMapGeneration,  unsigned int multisampleSamples,
>   unsigned int multisampleColorSamples)
> 
> 
> method.
> 
> 
> Cheers,
> 
> Wojtek Lewandowski
> 
> 
> 2016-12-09 11:01 GMT+01:00 Krzysztof Rahn <Krzysztof.Rahn+ (Krzysztof.Rahn+)>:
> 
> > Hello everyone,
> > 
> > I'm working on a company project that displays navigation maps for ships with OpenSceneGraph.
> > The product we develop is a library that generates map images, so a customer (developer)
> > can use our library to develop its own navigation system.
> > 
> > This requires to generate a offscreen image and if possible an antialiased one.
> > Unfortunately we can not generate a antialiased offscreen image.
> > 
> > I already tried
> > 
> > > osg::DisplaySettings::instance()->setNumMultiSamples(4);
> > > 
> > 
> > and
> > 
> > > traits->samples = 4;
> > > 
> >  to create a osg::GraphicsContext
> > but this only works with a window generated from OpenSceneGraph or
> > with a embedded context (osgViewer::GraphicsWindowEmbedded()).
> > 
> > I know we can enable "GL_LINE_SMOOTH". This is what we use at this moment and it is
> > working with offscreen rendering but we really need multisampling for better results (or any other form of anitaliasing).
> > 
> > I created a small peace of C++ sourcecode on a Linux system that does offscreen rendering (with a pbuffer)
> > into a tga image file (I think you also need OpenSceneGraph plugins for that to work),
> > so you can roughly see how we use it at this moment (without GL_LINE_SMOOTH to keep it simple).
> > 
> > Of course I looked into the examples and this peace of code is based of one of them.
> > But I could not spot anything in the examples that could help me.
> > I also searched in the forum on this topic but most threads about offscreen rendering don't consider if multisampling is enabled.
> > 
> > I would really appreciate if someone could help us with this small code in the right direction
> > or make any suggestion if there is any other way to solve this if OpenSceneGraph is not able to do this.
> > 
> > A main.cpp and a CMakeLists.txt should be attached to this post.
> > 
> > Thank you very much,
> >   Kris
> > 
> > ------------------
> > Read this topic online here:
> > http://forum.openscenegraph.org/viewtopic.php?p=69644#69644 (http://forum.openscenegraph.org/viewtopic.php?p=69644#69644)
> > 
> > 
> > 
> > 
> > Attachments:
> > http://forum.openscenegraph.org//files/cmakelists_664.txt (http://forum.openscenegraph.org//files/cmakelists_664.txt)
> > http://forum.openscenegraph.org//files/main_667.cpp (http://forum.openscenegraph.org//files/main_667.cpp)
> > 
> > 
> > _______________________________________________
> > osg-users mailing list
> >  ()
> > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org)
> > 
> 
> 
>  ------------------
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I guess I will need to test how FBO work. I though that pbuffer and FBO will not make a big difference.
Thank you.

------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=69649#69649