Hi Robert, I've run into the situation multiple times where having a global draw callback would have been very convenient. It's mostly been for debugging scenarios, but I can also see other situations where being able to globally augment draw calls would also be useful.
What are your thoughts on having a global draw callback part of the osg::State object? It doesn't seem like much code would need to be changed, and the performance impact should be minimal. Essentially, osgUtil::RenderLeaf would be modified to call: state.draw(_drawable, renderInfo); And osg::State::draw would look like: if(_drawCallback.valid()) _drawCallback->draw(_drawable, renderInfo); else _drawable->draw(renderInfo); Does this seem like a reasonable feature to add? I can work on a patch if you feel it's appropriate. Cheers, Farshid
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