Example: Cornell Box

{
  "state": {
    "path_tracing": {
      "spp": 64,
      "max_path_depth": 64
    }
  },
  "camera": {
    "type": "perspective",
    "fov": 19.5,
    "film": {
      "resolution": [720, 720]
    }
  },
  "lights": [
    {
      "type": "rect",
      "position": [-0.24, 1.98, -0.22],
      "v1": [0.23, 1.98, -0.22],
      "v2": [-0.24, 1.98, 0.16],
      "radiance": [17, 12, 4],
      "double_side": false
    }
  ],
  "materials": [
    {
      "name": "LeftWall",
      "type": "brdf_lambertian",
      "diffuse_reflectance": [0.63, 0.065, 0.05]
    },
    {
      "name": "RightWall",
      "type": "brdf_lambertian",
      "diffuse_reflectance": [0.14, 0.45, 0.091]
    },
    {
      "name": "Floor",
      "type": "brdf_lambertian",
      "diffuse_reflectance": [0.725, 0.71, 0.68]
    },
    {
      "name": "Ceiling",
      "type": "brdf_lambertian",
      "diffuse_reflectance": [0.725, 0.71, 0.68]
    },
    {
      "name": "BackWall",
      "type": "brdf_lambertian",
      "diffuse_reflectance": [0.725, 0.71, 0.68]
    },
    {
      "name": "ShortBox",
      "type": "brdf_lambertian",
      "diffuse_reflectance": [0.725, 0.71, 0.68]
    },
    {
      "name": "TallBox",
      "type": "brdf_lambertian",
      "diffuse_reflectance": [0.725, 0.71, 0.68]
    }
  ],
  "meshes": [
    {
      "name": "ceiling",
      "path": "ceiling.obj"
    },
    {
      "name": "floor",
      "path": "floor.obj"
    },
    {
      "name": "leftwall",
      "path": "leftwall.obj"
    },
    {
      "name": "rightwall",
      "path": "rightwall.obj"
    },
    {
      "name": "backwall",
      "path": "backwall.obj"
    },
    {
      "name": "shortbox",
      "path": "shortbox.obj"
    },
    {
      "name": "tallbox",
      "path": "tallbox.obj"
    }
  ],
  "instances": [
    {
      "mesh": "floor",
      "material": "Floor"
    },
    {
      "mesh": "ceiling",
      "material": "Ceiling"
    },
    {
      "mesh": "leftwall",
      "material": "LeftWall"
    },
    {
      "mesh": "rightwall",
      "material": "RightWall"
    },
    {
      "mesh": "backwall",
      "material": "BackWall"
    },
    {
      "mesh": "shortbox",
      "material": "ShortBox"
    },
    {
      "mesh": "tallbox",
      "material": "TallBox"
    }
  ],
  "shots": [
    {
      "type": "lookat",
      "eye": [0, 1, 6.8],
      "lookat": [0, 1, 0],
      "up": [0, 1, 0]
    }
  ]
}

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