{
  "contract": "GrandCore COLORS v002; Huckleberry digital conceptual architectural material cell, not an as-built room; V004 functional web system protected",
  "geometry_units": "metres, approximate conceptual scale, NOT measured",
  "render_engine": "VTK 9.6.2 PBR offline EGL renderer, deterministic seeded texture synthesis",
  "materials": {
    "HUX-M01-SATIN-COPPER": {
      "substrate": "conceptual solid copper alloy fascia on structural carrier (unverified grade)",
      "metallic": 1.0,
      "roughness": 0.32,
      "anisotropy": 0.52,
      "treatment": "directionally brushed, hand-rubbed satin; recessed screw covers",
      "thickness_m": 0.038,
      "texture_scale_mm": 0.35,
      "function": "display frame and visual wayfinding",
      "provenance": "PROPOSED / not manufacturer verified",
      "artist_linear_rgb_candidate": [
        0.8,
        0.43,
        0.22
      ],
      "polished_inner_rim_roughness": 0.24,
      "satin_section_roughness": 0.36
    },
    "HUX-W01-EBONIZED-WALNUT": {
      "substrate": "conceptual American walnut veneer over stable joinery substrate",
      "metallic": 0.0,
      "roughness": 0.47,
      "anisotropy": 0.06,
      "treatment": "ebonized pigmented grain with satin oil finish, visible longitudinal grain",
      "thickness_m": 0.022,
      "texture_scale_mm": 4.0,
      "function": "absorptive display surround and acoustic identity",
      "provenance": "PROPOSED",
      "artist_linear_rgb_candidate": [
        0.27,
        0.17,
        0.12
      ]
    },
    "HUX-T01-WOOL-FELT": {
      "substrate": "conceptual charcoal wool acoustic felt (physical absorption unmeasured)",
      "metallic": 0.0,
      "roughness": 0.92,
      "anisotropy": 0.0,
      "treatment": "fibrous matte, low specularity",
      "thickness_m": 0.04,
      "texture_scale_mm": 1.4,
      "function": "acoustic visual identity; no absorption claim",
      "provenance": "PROPOSED",
      "artist_linear_rgb_candidate": [
        0.105,
        0.103,
        0.108
      ]
    },
    "HUX-G01-GLASS": {
      "substrate": "conceptual low-iron architectural laminated glass",
      "metallic": 0.0,
      "roughness": 0.09,
      "ior": 1.5,
      "treatment": "polished edges with slight green edge tint; VTK alpha fallback and no certified refraction",
      "thickness_m": 0.012,
      "texture_scale_mm": 0.0,
      "function": "glazed protective display cover",
      "provenance": "PROPOSED"
    },
    "GC-S01-HONED-BASALT": {
      "substrate": "conceptual honed black basalt cladding",
      "metallic": 0.0,
      "roughness": 0.67,
      "anisotropy": 0.0,
      "treatment": "fine stone flecks and restrained joints, matte honed finish",
      "thickness_m": 0.03,
      "texture_scale_mm": 3.5,
      "function": "wall plinth/floor display support",
      "provenance": "PROPOSED",
      "artist_linear_rgb_candidate": [
        0.115,
        0.12,
        0.125
      ]
    },
    "HUX-L01-DIFFUSED-LED": {
      "substrate": "conceptual recessed LED strip behind opal-polycarbonate diffusion",
      "metallic": 0.0,
      "roughness": 0.35,
      "treatment": "emissive diffused surface matched to dedicated nearby VTK lights, actual received shadow/falloff only approximate",
      "thickness_m": 0.016,
      "texture_scale_mm": 0.0,
      "function": "portal edge illumination and orientation",
      "provenance": "PROPOSED"
    },
    "HUX-C01-PAINTED-STEEL": {
      "substrate": "conceptual graphite powder-coated steel",
      "metallic": 0.0,
      "roughness": 0.55,
      "treatment": "powder coat on steel, restrained edge wear",
      "thickness_m": 0.004,
      "texture_scale_mm": 1.0,
      "function": "display mount and stylized equipment housing",
      "provenance": "PROPOSED"
    },
    "HUX-P01-EDITORIAL-ART": {
      "substrate": "existing V004 generated Huckleberry conceptual illustration, printed/displayed as artwork not a photograph",
      "metallic": 0.0,
      "roughness": 0.48,
      "treatment": "matte archival print reproduction inside framed display",
      "thickness_m": 0.003,
      "texture_scale_mm": 0,
      "function": "visual reference and brand storytelling, no source-site parity claim",
      "provenance": "PROTECTED V004 ART"
    }
  },
  "lighting": {
    "neutral": "large diffuse cool-white 5200K area-light proxy + soft white fill, clear material study",
    "grazing": "lateral 4500K raking light at glancing incidence and weak counter fill, exposes grain/edges",
    "cinematic": "warm 2900K practical scene lamps + soft overhead plus a separate visible violet LED with reflected illumination approximated; material definitions identical"
  },
  "evidence_ceiling": "DIGITAL CONCEPTUAL MATERIAL DESIGN (NOT measured reflectance, sampled substrate chemistry, physical buildability, GLB transport, or actual Huckleberry site screenshot)",
  "material_linkage": "CPU render source reads candidate RGB and roughness from this JSON; consistent geometry and textures across three light modes; not measured BRDF"
}