code: function MultiPrefabBufferGeometry(prefabs, repeatCount) {
    BufferGeometry.call(this);
  
    if (Array.isArray(prefabs)) {
      this.prefabGeometries = prefabs;
    } else {
      this.prefabGeometries = [prefabs];
    }
  
    this.prefabGeometriesCount = this.prefabGeometries.length;
  
    /**
     * Number of prefabs.
     * @type {Number}
     */
    this.prefabCount = repeatCount * this.prefabGeometriesCount;
    /**
     * How often the prefab array is repeated.
     * @type {Number}
     */
    this.repeatCount = repeatCount;
  
    /**
     * Array of vertex counts per prefab.
     * @type {Array}
     */
    this.prefabVertexCounts = this.prefabGeometries.map(function (p) {
      return p.isBufferGeometry ? p.attributes.position.count : p.vertices.length;
    });
    /**
     * Total number of vertices for one repetition of the prefabs
     * @type {number}
     */
    this.repeatVertexCount = this.prefabVertexCounts.reduce(function (r, v) {
      return r + v;
    }, 0);
  
    this.bufferIndices();
    this.bufferPositions();
  }
docs: A BufferGeometry where a 'prefab' geometry array is repeated a number of times.
  
  @param {Array} prefabs An array with Geometry instances to repeat.
  @param {Number} repeatCount The number of times to repeat the array of Geometries.
  @constructor