scGranite

The stone Saltcrown is built out of. Cut granite in staggered courses with chamfered joints, per-block colour and roughness variation, and rain streaks down the faces — and, drawn on top of all of it in WORLD SPACE, the waterline: a dark saturated wet band that fades upward out of the sea, a patch of weed right where the tide sits, and a crust of salt bloom above it that collects in the mortar grooves and on the upward-facing ledges of every course.

water_y is the live waterline; the tower slice drives it from Core.tideY() every frame, so the wet band, the weed and the salt crust climb the tower as the sea does, and stone that goes under fades into sea_color with murk so a drowned floor reads as a dark shape beneath the surface rather than disappearing.

natural: 1 drops the courses and switches to chunky wave-cut rock — that is the bare sea-pillar below the cut shoulder. soot, streak and accent carry the per-archetype character: a sooted kiln, a timber-warm granary, the pale limestone of a shrine.