Basic Cube

test.js

{
  "metadata": {
    "formatVersion": 3,
    "sourceFile": "this",
    "generatedBy": "this",
    "vertices": 8,
    "normals": 8,
    "faces": 12,
    "colors": 0,
    "uvs": 0,
    "materials": 0
  },
  "scale": 1.0,
  "materials": [
    {
      "DbgColor": 0,
      "DbgIndex": 0,
      "DbgName": "default"
    }
  ],
  "vertices": [
    0.0,
    0.0,
    0.0,
    5.0,
    0.0,
    0.0,
    5.0,
    0.0,
    -5.0,
    0.0,
    0.0,
    -5.0,
    0.0,
    5.0,
    0.0,
    5.0,
    5.0,
    0.0,
    5.0,
    5.0,
    -5.0,
    0.0,
    5.0,
    -5.0
  ],
  "normals": [
    -0.408248,
    -0.408248,
    0.816497,
    0.666667,
    -0.666667,
    0.333333,
    0.408248,
    -0.408248,
    -0.816497,
    -0.666667,
    -0.666667,
    -0.333333,
    -0.666667,
    0.666667,
    0.333333,
    0.408248,
    0.408248,
    0.816497,
    0.666667,
    0.666667,
    -0.333333,
    -0.408248,
    0.408248,
    -0.816497
  ],
  "faces": [
    3,
    0,
    4,
    0,
    1,
    5,
    3,
    2,
    1,
    1,
    2,
    6,
    7,
    6,
    2,
    6,
    7,
    4,
    3,
    4,
    7,
    0,
    5,
    4,
    3,
    1,
    0,
    1,
    6,
    5,
    7,
    2,
    3,
    6,
    4,
    5
  ],
  "morphTargets": [],
  "morphColors": [],
  "colors": [],
  "uvs": []
}

Here the face type bitmask is not applied thus the cube comes out looking very strange.