code: function selectDimensionsAndMaterials() {
    let reverbLength = document.getElementById('reverbLengthSelect').value;
    switch (reverbLength) {
      case 'none':
      default:
      {
        return {
          dimensions: {
            width: 0,
            height: 0,
            depth: 0,
          },
          materials: {
            left: 'transparent',
            right: 'transparent',
            front: 'transparent',
            back: 'transparent',
            up: 'transparent',
            down: 'transparent',
          },
        };
      }
      break;
      case 'short':
      {
        return {
          dimensions: {
            width: 1.5,
            height: 1.5,
            depth: 1.5,
          },
          materials: {
            left: 'uniform',
            right: 'uniform',
            front: 'uniform',
            back: 'uniform',
            up: 'uniform',
            down: 'uniform',
          },
        };
      }
      break;
      case 'medium':
      {
        return {
          dimensions: {
            width: 6,
            height: 6,
            depth: 6,
          },
          materials: {
            left: 'uniform',
            right: 'uniform',
            front: 'uniform',
            back: 'uniform',
            up: 'uniform',
            down: 'uniform',
          },
        };
      }
      break;
      case 'long':
      {
        return {
          dimensions: {
            width: 24,
            height: 24,
            depth: 24,
          },
          materials: {
            left: 'uniform',
            right: 'uniform',
            front: 'uniform',
            back: 'uniform',
            up: 'uniform',
            down: 'uniform',
          },
        };
      }
      break;
    }
  }
docs: Select appropriate dimensions and materials.
  @return {Object}
  @private