code: function reorientNormals(array, matrix) {
    applyFuncToV3Array(array, m4.inverse(matrix), transformNormal);
    return array;
  }
docs: Reorients normals by the inverse-transpose of the given
  matrix..
  @param {(number[]|TypedArray)} array The array. Assumes value floats per element.
  @param {module:twgl/m4.Mat4} matrix A matrix to multiply by.
  @return {(number[]|TypedArray)} the same array that was passed in
  @memberOf module:twgl/primitives