schema-materials.json

{
  "$schema": "http://json-schema.org/schema",
  "title": "Material",
  "description": "PBR material using the Autodesk Standard Surface naming conventions: https://autodesk.github.io/standard-surface/",
  "type": "array",
  "items": {
    "additionalProperties": false,
    "properties": {
      "name": {
        "description": "Name of the material.",
        "type": "string",
        "default": "Name"
      },
      "color": {
        "description": "Albedo, or metal color, RGB triplet (vec3) in linear decimal format in rec709 primaries.",
        "type": "array",
        "items": {
          "type": "number"
        },
        "default": [0.5, 0.5, 0.5],
        "minItems": 3,
        "maxItems": 3
      },
      "metalness": {
        "type": "number",
        "default": 0
      },
      "specularColor": {
        "description": "Specular tint for metals (edge tint), calculated from n and k values.",
        "type": "array",
        "items": {
          "type": "number"
        },
        "default": [1, 1, 1],
        "minItems": 3,
        "maxItems": 3
      },
      "roughness": {
        "type": "number",
        "default": 0.5
      },
      "ior": {
        "type": "number",
        "default": 1.5
      },
      "subsurfaceRadius": {
        "description": "The approximate distance up to which light can scatter below the surface, also known as “mean free path” (MFP).",
        "type": "array",
        "items": {
          "type": "number"
        },
        "default": [1, 1, 1],
        "minItems": 3,
        "maxItems": 3
      },
      "transmission": {
        "description": "",
        "type": "number",
        "default": 0
      },
      "transmissionColor": {
        "description": "",
        "type": "array",
        "items": {
          "type": "number"
        },
        "default": [1, 1, 1],
        "minItems": 3,
        "maxItems": 3
      },
      "transmissionDispersion": {
        "description": "Abbe number, describing how much the index of refraction varies across wavelengths. For glass and diamonds, this is typically in the range of 10 to 70, with lower numbers giving more dispersion.",
        "type": "number",
        "default": 0
      },
      "complexIor": {
        "description": "Complex IOR values, n (refractive index), and k (extinction coefficient), for each color channel, in the following order: nR, kR, nG, kG, nB, kB. Calculated with a wavelength of 0.65 for red, 0.55 for green and 0.45 for blue.",
        "type": "array",
        "items": {
          "type": "number"
        },
        "default": [0, 0, 0, 0, 0, 0],
        "minItems": 6,
        "maxItems": 6
      },
      "density": {
        "description": "Density measured in kg/m3.",
        "type": "number",
        "default": 1000
      },
      "densityRange": {
        "description": "The typical range of density.",
        "type": "array",
        "items": {
          "type": "number"
        },
        "default": [1000, 1000],
        "minItems": 2,
        "maxItems": 2
      },
      "acousticAbsorption": {
        "description": "Absorption coefficients at 125, 250, 500, 1000, 2000, and 4000 kHz.",
        "type": "array",
        "items": {
          "type": "number"
        },
        "default": [0.5, 0.5, 0.5, 0.5, 0.5, 0.5],
        "minItems": 6,
        "maxItems": 6
      },
      "category": {
        "type": "array",
        "items": {
          "enum": [
            "Calibration",
            "Crystal",
            "Gas",
            "Human",
            "Liquid",
            "Manmade",
            "Metal",
            "Organic",
            "Plastic"
          ]
        },
        "minItems": 1,
        "maxItems": 1
      },
      "group": {
        "description": "Can be used to group similar materials together.",
        "type": "string",
        "default": "Group"
      },
      "description": {
        "type": "string",
        "maxLength": 500
      },
      "sources": {
        "type": "array",
        "items": {
          "type": "string",
          "minLength": 1
        },
        "minItems": 1,
        "uniqueItems": true
      },
      "tags": {
        "description": "Tags",
        "type": "array",
        "items": {
          "type": "string"
        },
        "uniqueItems": true
      },
      "reference": {
        "type": "array",
        "items": {
          "type": "string",
          "minLength": 1
        },
        "uniqueItems": true
      }
    },
    "required": [
      "name",
      "color",
      "metalness",
      "roughness",
      "ior",
      "density",
      "category",
      "description",
      "sources"
    ]
  }
}