[osg-users] Is it possible to temporarily redirect the main camera of a view?

[Werner Modenbach]

Hi Glen,

thanks for the hint. I'm still sticking with version 3.2 and this method 
is not available there.
I will try to move to the latest version and do like you suggested.

Thanks

- Werner -

Am 09.03.2017 um 15:24 schrieb Glenn Waldron:
> Werner,
> I have never switched render targets at runtime before, but I have 
> switched attachments and needed to call camera->dirtyAttachmentMap() 
> after calling attach() or detach(). Maybe that will work.
>
> Glenn Waldron
>
> On Thu, Mar 9, 2017 at 9:10 AM, Werner Modenbach 
> <Werner.Modenbach at texion.eu <mailto:Werner.Modenbach at texion.eu>> wrote:
>
>     Hi all.
>
>     Is it possible to redirect the main camera of a view temporarily
>     to a FBO?
>     It is my intention to get a snapshot of the scene with a modified
>     projection matrix.
>     I think about something like that:
>
>     osg::ref_ptr<osg::Camera> camera = view->getCamera();
>     osg::Camera::RenderTargetImplementation rti =
>     camera->getRenderTargetImplementation();
>     osg::MatrixdprojectionMatrix=view->getCamera()->getProjectionMatrix();
>     camera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
>     osg::ref_ptr<osg::Image> fbImage=newosg::Image;
>
>     fbImage->allocateImage(width,height,1,GL_RGBA,GL_UNSIGNED_BYTE,1);
>
>     camera->attach(osg::Camera::COLOR_BUFFER,fbImage.get(),0,0);
>
>     camera->setProjectionMatrix(projectionMatrix*offsetMatrix);
>
>     view->frame(); camera->setRenderTargetImplementation(rti);
>     camera->detach(osg::Camera::COLOR_BUFFER );
>
>     camera->setProjectionMatrix(projectionMatrix);
>
>
>     I tried it but my screen gets updated on the frame()  call with
>     the modified projection matrix and the image stays black. Thanks
>     for any hints.- Werner -
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