{
  "name": "Kiduna Canonical Material Responses",
  "version": "0.1.0",
  "authoringRig": { "key": "upper-left warm", "fill": "upper-right cool", "contactShadow": "soft separable", "sceneNeutrality": "no fixed background atmosphere baked into component" },
  "materials": [
    { "id": "carved-stone", "baseRoles": ["stone", "espresso"], "roughness": [0.72, 0.94], "metalness": 0, "edge": "chipped and softly highlighted", "aging": "dark crevice dust, moss only when context permits" },
    { "id": "dark-wood", "baseRoles": ["warm-umber", "espresso"], "roughness": [0.58, 0.82], "metalness": 0, "edge": "handled edges warm and smooth", "aging": "fine scratches follow grain" },
    { "id": "aged-brass", "baseRoles": ["aged-brass", "sun-gold"], "roughness": [0.32, 0.58], "metalness": 0.9, "edge": "rubbed highlights; no chrome", "aging": "darkened recesses, restrained verdigris" },
    { "id": "restrained-gilding", "baseRoles": ["sun-gold", "aged-brass"], "roughness": [0.24, 0.48], "metalness": 0.94, "edge": "thin rubbed highlight over a darker structural substrate", "aging": "selective wear at handled or ceremonial edges; never broad sovereign coverage" },
    { "id": "enamel-teal", "baseRoles": ["enamel-teal"], "roughness": [0.16, 0.3], "metalness": 0.05, "edge": "thin bright inset rim", "aging": "sparse hairline wear, never broad distress" },
    { "id": "optical-glass", "baseRoles": ["portal-sky", "atmospheric-blue"], "roughness": [0.04, 0.15], "metalness": 0, "edge": "environment-colored rim", "aging": "minute dust only at focal scale" },
    { "id": "linen", "baseRoles": ["moon-cream", "parchment"], "roughness": [0.82, 0.96], "metalness": 0, "edge": "soft woven boundary", "aging": "subtle compression and fold memory" },
    { "id": "leather", "baseRoles": ["warm-umber"], "roughness": [0.44, 0.7], "metalness": 0, "edge": "dark cut edge with warm wear", "aging": "creases at use points" },
    { "id": "ceramic", "baseRoles": ["moon-cream", "enamel-teal"], "roughness": [0.22, 0.45], "metalness": 0, "edge": "soft glaze rolloff", "aging": "fine crazing, no large chips by default" },
    { "id": "foliage", "baseRoles": ["vegetation-shadow", "vegetation-light"], "roughness": [0.72, 0.96], "metalness": 0, "edge": "clustered feathered leaf silhouettes", "aging": "seasonal variation via Design token" },
    { "id": "water", "baseRoles": ["atmospheric-blue", "enamel-teal"], "roughness": [0.05, 0.24], "metalness": 0, "edge": "transparent depth edge and sky reflection", "aging": "particulate and ripple depend on Scene" },
    { "id": "fire", "baseRoles": ["candle-gold", "sunset-amber"], "roughness": [0, 0], "metalness": 0, "edge": "soft additive falloff", "aging": "not applicable; state controls flame" },
    { "id": "atmosphere", "baseRoles": ["atmospheric-blue", "sunset-amber", "moon-cream"], "roughness": [0, 1], "metalness": 0, "edge": "depth-dependent haze with no hard plate boundary", "aging": "not applicable; Scene time and weather govern variation" },
    { "id": "distant-landscape", "baseRoles": ["stone", "vegetation-shadow", "atmospheric-blue"], "roughness": [0.55, 0.95], "metalness": 0, "edge": "softened by distance and transition-band overlap", "aging": "season, weather and Realm Design govern the distant surface" }
  ]
}