3D terrain: the map's surface raised by the elevation source. MapLibre does not light that surface,
so it shows no relief from above and light does not shade it; add features.hillshade for that.
The terrain reads the source elevation, or elevation-terrain next to a hillshade: MapLibre loads
a terrain source's tiles one zoom level coarser, which would blur a hillshade sharing it.
3D terrain: the map's surface raised by the elevation source. MapLibre does not light that surface, so it shows no relief from above and
lightdoes not shade it; addfeatures.hillshadefor that. The terrain reads the sourceelevation, orelevation-terrainnext to a hillshade: MapLibre loads a terrain source's tiles one zoom level coarser, which would blur a hillshade sharing it.