stonecut

The lozengy masonry of the tower: a surface shader that cuts coursed rubble into a parallelogram prism. It lays bed and perpend joints from the face-local uv the mesh carries, bites the stone with a chisel fbm, leaches the tincture off the weathered lower part of every stone, breaks the arris at the corners, and reads the chamfered arris band as a lit upper edge over a shadowed lower one. A cap face carries the lozengy field itself: the two tinctures on diamonds laid along the town's own arms.

The tincture, the per-course variation and the gilt line a perfect seat earns all arrive per-instance in shader_data, so one material dresses the whole tower. Consumed by masonry.material, which game.blocks.Blocks puts on every course, on the plinth and on every offcut.