scenejs.runtime-state2.js

var graph = SceneJs.graph(
    SceneJs.node({
            preVisit: function(nodeContext) {

                // Parent node gets graph context from node context
                // and sets something on it for child

                var graphContext = nodeContext.getGraphContext();
                graphContext.foo = 'Hi, child nodes!';

            },

            postVisit: function(nodeContext) {

                // Ordinarily each node should restore the graph context
                // to its original state before it was modified on pre-visit

                var graphContext = nodeContext.getGraphContext();
                graphContext.foo = null;
            }
        },
                       
        SceneJs.node({
                preVisit: function(nodeContext) {

                    // Child node finds what parent set on graph context

                    var graphContext = nodeContext.getGraphContext();
                    alert('Message from parent: ' + graphContext.foo);
                }
        })
    )
);

// If not supplied, a default internal graph runtime context is
// created that will not persist between traversals

graph.traverse();