Hi Robert, The osg::Camera has a post and final draw callbacks which are perfect for implementing custom read pixel operations, and already work seamlessly with the code in RenderStage. So rather than attach your own osg::Image to the Camera and expect it to be filled in a custom way the appropriate thing to do is attach a post draw callback to the Camera instead and let it do what it wants - including call osg::Image::readPixels if it sees so fit.
Robert. On Mon, Dec 7, 2009 at 7:20 PM, Robert Milharcic <[email protected]> wrote: > > Hi Robert, > > I don't understand why you are using a readPixels() callback. Why not > just avoid calling readPixels() completely and have your own custom > method in your own code. > > Is it there is some higher level OSG functionality that you're > actually trying to customize? > > > Yes, that is correct! Image::readPixels is called by the framework > (osgUtil::RenderStage::drawInner) when you attach image to the camera. Hence, > if one decides to go custom way he/she is left with no other option but to > duplicate well-written and well-tested camera attachement code. But as I said > before, readPixels callback is low priority feature which may be left out if > no one cares... > > > > On Mon, Dec 7, 2009 at 2:18 PM, Robert Milharcic > <[email protected]> wrote: >> Attached is modified (SVN) osg/Image header and osg/image.cpp that adds >> ReadPixels callback. It can be used to override default Image::readPixels >> implementation. The reasons I'm proposing this *low priority* addition are >> as follows: >> >> - one can change how pixel packing is handled >> - implement alternative image allocation strategies (for image banding and >> tiling as an example) >> - on a fly pixel data processing >> .. and more. >> >> Robert M. >> >> _______________________________________________ >> osg-submissions mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-submissions-openscenegraph.org >> >> > _______________________________________________ > osg-submissions mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-submissions-openscenegraph.org > > _______________________________________________ > osg-submissions mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-submissions-openscenegraph.org > > _______________________________________________ osg-submissions mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-submissions-openscenegraph.org
