atelier_surface

The one surface shader the atelier is built out of. pattern selects a family — 0 lime plaster, 1 fired floor tomettes, 2 marble, 3 oiled walnut, 4 copper and brass, 5 flat — and the rest of the properties tune it: two colours it mixes between, scale in metres, grout for the tile channel, bump for how far the procedural height pushes the normal, variation for large-scale tone drift.

The pattern is evaluated in world space and projected onto whichever axis a face looks along, so geometry needs no UVs and a box stretched to the size of a wall carries the same grain as one the size of a windowsill.