如何在autodesk forge查看器中为对象添加厚度

<script src="https://developer.api.autodesk.com/modelderivative/v2/viewers/7.*/viewer3D.min.js"></script>

<div id="forgeViewer"></div>

var viewer;

function initializeViewer() {
  var options = {
    env: 'AutodeskProduction',
    accessToken: 'YOUR_ACCESS_TOKEN'
  };

  Autodesk.Viewing.Initializer(options, function() {
    viewer = new Autodesk.Viewing.GuiViewer3D(document.getElementById('forgeViewer'));
    viewer.start();

    var documentId = 'YOUR_MODEL_DOCUMENT_ID';
    Autodesk.Viewing.Document.load(documentId, function(doc) {
      var viewable = doc.getRoot().getDefaultGeometry();
      viewer.loadDocumentNode(doc, viewable);
    }, function(errorMsg) {
      console.error('Error loading Forge model: ' + errorMsg);
    });
  });
}

initializeViewer();

function addThicknessToModel(thickness) {
  var model = viewer.model;

  model.getExternalIdMapping(function(mapping) {
    var fragIds = Object.keys(mapping);

    fragIds.forEach(function(fragId) {
      var dbId = mapping[fragId];
      var fragProxy = viewer.impl.getFragmentProxy(model, fragId);

      fragProxy.getAnimTransform();
      fragProxy.scale = new THREE.Vector3(1, 1, thickness);
      fragProxy.updateAnimTransform();
    });

    viewer.impl.sceneUpdated(true);
  });
}

addThicknessToModel(0.1); // 添加 0.1 的厚度