Copper roof cladding with verdigris corrosion. Discoloration is
driven by a single fBm patina mask that controls all four maps in
lockstep — colour, metallic, roughness and surface relief — so the
green patches read as physical corrosion rather than a tinted paint.
Color lerps from aged copper through bright verdigris flake
to deep patina as the mask climbs through patinaCoverage.
Metallic flips from 1.0 (bare copper, tinted Fresnel
reflector) to 0.0 (verdigris, a copper-carbonate dielectric)
across the same threshold.
Roughness climbs from copperRoughness to patinaRoughness
so the patinated patches kill the IBL specular and look matte.
Normal combines a standing-seam ridge field with the fBm
micro-relief, then bumps the patina patches further. Seams run
along the V axis (down-slope), the convention for traditional
batten-and-seam copper roofing.
Copper roof cladding with verdigris corrosion. Discoloration is driven by a single fBm patina mask that controls all four maps in lockstep — colour, metallic, roughness and surface relief — so the green patches read as physical corrosion rather than a tinted paint.
patinaCoverage.1.0(bare copper, tinted Fresnel reflector) to0.0(verdigris, a copper-carbonate dielectric) across the same threshold.copperRoughnesstopatinaRoughnessso the patinated patches kill the IBL specular and look matte.