col_concrete

Cast concrete for the collapse building's slabs, columns and panels. Pattern space is object-local position (via vertex color) so it stays glued to tumbling debris: aggregate speckle and dark flecks, pour bands along local height, form-tie holes on a coarse grid, blotch stains, and edge spall keyed off the authored box UVs exposing a darker aggregate core. seed de-correlates repeated chunk meshes; impact_glow adds the strike bounce light.