soot_brick

The terrace walls of Lamplighter's Round. Stretcher-bond stock brick with its courses, mortar joints, stone plinth, window openings, dressings and the odd lit room all cut procedurally from world-space coordinates rather than modelled, so one material dresses every wall of every house and the window lattice runs continuously across a terrace built on the same 8 m grid. The horizontal axis is picked from the face normal, so the same shader is correct on a wall facing either street. The soot gradient darkens the brick towards the eaves until there is almost nothing left up there for the fog to eat.