OptionalbeforeLayerConfig?: BeforeLayerConfigWhere the 3D trees go in the map's layer stack: below the style layer it names, or on top, as a
map module's beforeLayerConfig places its layers, on top where the style lacks that layer and
under the POIs where it lacks lowest3D. They also go below every layer a module or your app put
right under that one, so a route or a place drawn there stays over the trees, whichever was added
first. The textures stay right after the layers they texture. Not a knob: it moves layers rather
than restyling them.
The surfaces' configuration: each knob of glSurfacesKnobCatalogue at its id's path, all optional, and where the 3D trees go in the layer stack.