Hi Andrea, The osg::KdTree is design for the purpose of accelerating intersection testing. What you need to do is run the KdTreeBuilder visitor on your subgraph to generate KdTree for each osg::Geometry in the subgraph, these then get assigned automaticaly to each osg::Geometry as a Shape. The intersection traversals then automatically detect the KdTree when available and use it instead of the raw primitive data into the Geometry.
I would also strongly recommend upgrading 3.6.3, it even contains some nice improvement for KdTree building and intersections. Robert.
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