code: function(min, max) {
      return function limitPitch(params) {
        params.pitch = clamp(params.pitch, min, max);
        return params;
      };
    }
docs: Returns a view limiter that constrains the pitch angle.
  @param {number} min The minimum pitch value.
  @param {number} max The maximum pitch value.
  @return {RectilinearViewLimiter}