Viewer3d.allAreVisible();

Returns true if every node is visible.

Viewer3d.hideAll();

Ensures everything is invisible. (** NOT IMPLEMENTED YET **)

Viewer3d.showAll();

Ensures everything is visible.

Viewer3d.anyLayerHidden();

Returns true if any layer is hidden.

Viewer3d.getHiddenNodes();

Returns array of hidden nodes to debugger console.

Viewer3d.getIsolatedNodes();

Returns array of isolated nodes to debugger console.