[osg-users] Read frame buffer back into main memory

Sebastian Messerschmidt sebastian.messerschmidt at gmx.de
Thu Mar 1 00:53:53 PST 2018

Hi Antoine,

set a postDrawCallback to the pass/camera that writes to the texture.

In the callback:

virtual void operator () (osg::RenderInfo& render_info) const
     osg::State* state=render_info.getState();
     state->applyTextureAttribute(0, mTexture);
GL_FLOAT ); //change the GL_FLOAT to your needs

the mTexture is passed to the callback using the original texture 
attached to the MRT.


Am 28/02/2018 um 19:05 schrieb Antoine Rennuit:
> Hi all,
> I need to read the frame buffer back into the main memory. I know this will kill performance but I only need to do it once.
> Is there a way to do that? I could not find clear answers on the internet.
> Thanks,
> Antoine.
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=72990#72990
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