Lighting effect on terrain?

[larsmaxfield]

Has anyone implemented lighting of terrain directly in maplibre-gl-js, or perhaps see a path towards doing so?

Something similar to how the surface reflects light in deck.gl TerrainLayer:

I'd like to enhance our users' perception of 3D surfaces beyond hillshading and the parallax caused by 3D movement, but I'd like to stay within the mechanisms of this library.

[cleven12]

Not on the terrain mesh. terrain displaces the surface and the raster is draped over it. The style light property lights fill-extrusions, not those triangles, so it won't give you the deck.gl TerrainLayer look.

What you can do without leaving the library is a hillshade layer on the same raster-dem. hillshade-illumination-direction and hillshade-illumination-altitude are the sun angle, and hillshade-method can be multidirectional if one light looks flat. That's the supported version of this. Shading the actual terrain triangles means a custom layer.