[osg-users] Offscreen rendering with multisampling

Rambabu Repaka ramboram488 at gmail.com
Fri Dec 9 02:34:39 PST 2016

Kris wrote:
> 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

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