Hi Robert -- Here's an interesting aspect of OSG's design I've just recently stumbled across. osgDB::ReaderWriter::writeNode's first param is a const osg::Node&. I can understand that writing a file is inherently a const operation as far as the scene graph is concerned. However, the obvious thing to do within writeNode is to traverse the node with a NodeVisitor, which requires calling Node::accept(), which requires the node to be non-const. So it seems like the nature of the design is to require writeNode to cast away const, but I wanted to check: Did you intend implementations of writeNode to do something other than use a NodeVisitor? Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com <http://www.skew-matrix.com/> 303 859 9466
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