Constructor table for the picking material pair of each geometry
type. Mirror of VISUAL_FACTORIES for the picking pipeline;
the create*PickingMaterial methods look up
PICKING_FACTORIES[kind][backend]() and instantiate it directly
(picking materials are not cached).
Constructor table for the picking material pair of each geometry type. Mirror of VISUAL_FACTORIES for the picking pipeline; the
create*PickingMaterialmethods look upPICKING_FACTORIES[kind][backend]()and instantiate it directly (picking materials are not cached).