OptionalaccentColour accentuating the steepest terrain.
OptionalexaggerationStrength of the shading (0 = flat), not the height of the 3D surface (elevation.exaggeration).
The standard styles ramp it to zero by zoom 13; setting it replaces the ramp with a constant.
OptionalhighlightColour of the lit slopes.
OptionallightDirection the light comes from, in degrees clockwise from north (335 is the cartographic default).
OptionalmaxZoom level up to which the shading is drawn: the standard styles stop at 13, and 22 keeps it at every zoom.
OptionalmethodHow the relief is shaded.
OptionalshadowColour of the shaded slopes.
OptionalvisibleShows the hillshade.
The hillshade of the TerrainModule: light and shadow on the map surface that reveal hills, valleys and mountains, at any camera pitch.
Remarks
Everything but
visiblerestyles the style's own hillshade layer, and reads the style's own value while unset. Those settings only show oncevisibledoes.