meraHelper(camera);

  class MinMaxGUIHelper {
    constructor(obj, minProp, maxProp, minDif) {
      this.obj = obj;
      this.minProp = minProp;
      this.maxProp = maxProp;
      this.minDif = minDif;
    }
    get min() {
      return this.obj[this.minProp];
    }
    set min(v) {
      this.obj[this.minProp] = v;
      this.obj[this.maxProp] = Math.max(this.obj[this.maxProp], v + this.minDif);
    }
    get max() {
      return this.obj[this.maxProp];
    }
    set max(v) {
      this.obj[this.maxPro