Branching - Provide SceneJS.Selector Node

A SceneJS.Selector is a scene branch node that selects which among its children are currently active.

This node is useful for dynamically controlling traversal within a scene graph.

Examples

var s = new SceneJS.Selector({ selection: [0, 2]},
      new SceneJS.objects.teapot(),   // Child 0

      new SceneJS.objects.cube(),     // Child 1

      new SceneJS.objects.sphere())   // Child 2

s.setSelection([0,1,2]);  // Select all three child nodes

A more advanced example - the selector in this example switches between three viewpoints of the scene content. The content is instanced within each child of the Selector using Instance and Symbol nodes. When we render the scene, we can pass in the selection.

var myScene = new SceneJS.Scene({ ... },

   new SceneJS.symbol({ name: "theScene" },
        new SceneJS.objects.Teapot()
   ),
   new SceneJS.Selector(
           function(data) {   // Child index as a dynamic config
               return {
                   selection: [data.get("activeCamera")]  // Selection
               };
           },
       new SceneJS.LookAt({ eye : { z: 10.0 } },
            new SceneJS.Instance({ name: "theScene"})),

       new SceneJS.LookAt({ eye : { x: 10.0 }},
            new SceneJS.Instance({ name: "theScene"})),

       new SceneJS.LookAt({ eye : { x: -5.0, y: 5, z: 5 }},
            new SceneJS.Instance({ name: "theScene" })
       )
   )

   );
myScene.render({ activeCamera: 0 });  // Render scene for first viewpoint 
myScene.render({ activeCamera: 1 });  // Once more for second viewpoint