[away3d] Whats Aways version of Papervison viewportLayers

[John Brookes]

I know theres pushback but can you sort objects like in Papervison by
setting an index/sort order.How?

Also whats the away version of sorting by a triangles closest or furthest
vertex
do3d.meshSort = DisplayObject3D.MESH_SORT_CLOSE; //MESH_SORT_FAR