[osg-users] Offscreen rendering with multisampling

Wojciech Lewandowski w.p.lewandowski at gmail.com
Fri Dec 9 02:30:20 PST 2016

Hi Krzysztof,

Not sure about PBO but FBO support in OSG works with multisampling.

  BufferComponent buffer,
  osg::Texture* texture,
  unsigned int level,
  unsigned int face,
  bool mipMapGeneration,
  unsigned int multisampleSamples,
  unsigned int multisampleColorSamples)


Wojtek Lewandowski

2016-12-09 11:01 GMT+01:00 Krzysztof Rahn <
Krzysztof.Rahn+OpenSceneGraph at gmail.com>:

> 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
> Attachments:
> http://forum.openscenegraph.org//files/cmakelists_664.txt
> http://forum.openscenegraph.org//files/main_667.cpp
> _______________________________________________
> osg-users mailing list
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