DtOsgItersectorExclusions is a list of osg nodes from the scene graph and a list of element IDs to exclude from an intersect query. The renderer independent API provides a list of element IDs; the OSG-specific intersectors take these instead, which look up the nodes in the scene graph for the element ids provided for non-instanced elements; and maintain the element ids for use by the instance manager. Users of the OSG-specific interface may provide osg::nodes to exclude that are not for a specific element.
