{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://visualspec.dev/schema/1.0/modules/materials.schema.json",
  "title": "Materials",
  "description": "Interoperable material intent, texture bindings and physically based surface parameters.",
  "$defs": {
    "texture": {
      "type": "object",
      "properties": {
        "assetRef": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/id"
        },
        "channel": {
          "enum": [
            "r",
            "g",
            "b",
            "a",
            "rgb",
            "rgba"
          ]
        },
        "coordinateSet": {
          "type": "integer",
          "minimum": 0
        },
        "scale": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/vector2"
        },
        "offset": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/vector2"
        },
        "rotation": {
          "type": "number"
        },
        "wrap": {
          "enum": [
            "repeat",
            "clamp",
            "mirror"
          ]
        },
        "filter": {
          "enum": [
            "nearest",
            "linear",
            "anisotropic"
          ]
        },
        "strength": {
          "type": "number",
          "minimum": 0
        }
      },
      "required": [
        "assetRef"
      ],
      "additionalProperties": false
    },
    "material": {
      "type": "object",
      "properties": {
        "id": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/id"
        },
        "name": {
          "type": "string",
          "minLength": 1
        },
        "model": {
          "enum": [
            "pbr-metallic-roughness",
            "pbr-specular-glossiness",
            "unlit",
            "toon",
            "custom"
          ]
        },
        "baseColor": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/color"
        },
        "metalness": {
          "type": "number",
          "minimum": 0,
          "maximum": 1
        },
        "roughness": {
          "type": "number",
          "minimum": 0,
          "maximum": 1
        },
        "normal": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/materials.schema.json#/$defs/texture"
        },
        "emissive": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/appearance.schema.json#/$defs/color"
        },
        "emissiveIntensity": {
          "type": "number",
          "minimum": 0
        },
        "opacity": {
          "type": "number",
          "minimum": 0,
          "maximum": 1
        },
        "transmission": {
          "type": "number",
          "minimum": 0,
          "maximum": 1
        },
        "ior": {
          "type": "number",
          "minimum": 1
        },
        "clearCoat": {
          "type": "number",
          "minimum": 0,
          "maximum": 1
        },
        "clearCoatRoughness": {
          "type": "number",
          "minimum": 0,
          "maximum": 1
        },
        "doubleSided": {
          "type": "boolean"
        },
        "alphaMode": {
          "enum": [
            "opaque",
            "mask",
            "blend"
          ]
        },
        "alphaCutoff": {
          "type": "number",
          "minimum": 0,
          "maximum": 1
        },
        "textures": {
          "type": "object",
          "additionalProperties": {
            "$ref": "https://visualspec.dev/schema/1.0/modules/materials.schema.json#/$defs/texture"
          }
        },
        "assetRef": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/id"
        },
        "extensions": {
          "$ref": "https://visualspec.dev/schema/1.0/modules/common.schema.json#/$defs/extensions"
        }
      },
      "required": [
        "id",
        "model"
      ],
      "additionalProperties": false
    }
  },
  "$ref": "#/$defs/material"
}