code: function(min, max) {
      return function limitHfov(params) {
        var width = params.width;
        var height = params.height;
        if (width > 0 && height > 0) {
          var vmin = convertFov.htov(min, width, height);
          var vmax = convertFov.htov(max, width, height);
          params.fov = clamp(params.fov, vmin, vmax);
        }
        return params;
      };
    }
docs: Returns a view limiter that constrains the horizontal field of view.
  @param {number} min The minimum horizontal field of view.
  @param {number} max The maximum horizontal field of view.
  @return {RectilinearViewLimiter}