Hello Daniel,
daniel trindade wrote:
> I'm trying to use FBOViewport for rendering to a texture. After drawing
> the scene, i want to save the image.
>
> How can i read the image back to the CPU? Reading the posts on the list,
> i saw that setReadBuffer( true ) would solve my problem. But it seens
> that OSG 2.0 FBOViewport does not have this method anymore. And all the
> other posts i had read about this were using OSG 1.x, so i got a little
> confusing.
the FBOViewport is only in 2.0 for backward compatibility, if you are
developing a new application I'd recommend not to use it. Redirecting
rendering output to FBOs is now done with the Stage (and derived types,
which have a render target of type FrameBufferAttachment) - there are
examples for how to use them in Source/System/NodeCores/Groups/Stage and
Examples/Simple/fbotexture.cpp.
To get the texture read back to main memory, you need to:
fbo->setPostProcessOnDeactivate(true);
and
texBuf->setReadBack(true);
where fbo is the FrameBufferObject your Stage renders into and texBuf is
the TextureBuffer attached to the FBO.
That aside, it should not be too hard to support
FBOViewport::setReadBuffer() for compatibility.
Cheers,
Carsten
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